diff --git a/gdb/aarch64-fbsd-nat.c b/gdb/aarch64-fbsd-nat.c
index 51fd85800274..5cd2ccd46bff 100644
--- a/gdb/aarch64-fbsd-nat.c
+++ b/gdb/aarch64-fbsd-nat.c
@@ -124,8 +124,9 @@ aarch64_fbsd_nat_target::store_registers (struct regcache *regcache,
     }
 }
 
+void _initialize_aarch64_fbsd_nat ();
 void
-_initialize_aarch64_fbsd_nat (void)
+_initialize_aarch64_fbsd_nat ()
 {
   add_inf_child_target (&the_aarch64_fbsd_nat_target);
 }
diff --git a/gdb/aarch64-fbsd-tdep.c b/gdb/aarch64-fbsd-tdep.c
index 68ecfc30e8d2..b923c5c47404 100644
--- a/gdb/aarch64-fbsd-tdep.c
+++ b/gdb/aarch64-fbsd-tdep.c
@@ -170,8 +170,9 @@ aarch64_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, aarch64_fbsd_iterate_over_regset_sections);
 }
 
+void _initialize_aarch64_fbsd_tdep ();
 void
-_initialize_aarch64_fbsd_tdep (void)
+_initialize_aarch64_fbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD,
 			  aarch64_fbsd_init_abi);
diff --git a/gdb/aarch64-linux-nat.c b/gdb/aarch64-linux-nat.c
index b385b5866c0d..77d5863a56aa 100644
--- a/gdb/aarch64-linux-nat.c
+++ b/gdb/aarch64-linux-nat.c
@@ -996,8 +996,9 @@ triggers a breakpoint or watchpoint."),
 			   &maintenance_show_cmdlist);
 }
 
+void _initialize_aarch64_linux_nat ();
 void
-_initialize_aarch64_linux_nat (void)
+_initialize_aarch64_linux_nat ()
 {
   add_show_debug_regs_command ();
 
diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index b854dcdd58cb..67046c4271a3 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -1665,8 +1665,9 @@ aarch64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_gcc_target_options (gdbarch, aarch64_linux_gcc_target_options);
 }
 
+void _initialize_aarch64_linux_tdep ();
 void
-_initialize_aarch64_linux_tdep (void)
+_initialize_aarch64_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_LINUX,
 			  aarch64_linux_init_abi);
diff --git a/gdb/aarch64-newlib-tdep.c b/gdb/aarch64-newlib-tdep.c
index 15537bd8d8c0..456bae529fe6 100644
--- a/gdb/aarch64-newlib-tdep.c
+++ b/gdb/aarch64-newlib-tdep.c
@@ -36,8 +36,9 @@ aarch64_newlib_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->jb_pc = 11;
 }
 
+void _initialize_aarch64_newlib_tdep ();
 void
-_initialize_aarch64_newlib_tdep (void)
+_initialize_aarch64_newlib_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_NEWLIB,
 			  aarch64_newlib_init_abi);
diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index da41e2213076..8451a916dc3e 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -3406,8 +3406,9 @@ static void aarch64_process_record_test (void);
 }
 #endif
 
+void _initialize_aarch64_tdep ();
 void
-_initialize_aarch64_tdep (void)
+_initialize_aarch64_tdep ()
 {
   gdbarch_register (bfd_arch_aarch64, aarch64_gdbarch_init,
 		    aarch64_dump_tdep);
diff --git a/gdb/ada-exp.y b/gdb/ada-exp.y
index 01b5c2387509..c5e1e14299ec 100644
--- a/gdb/ada-exp.y
+++ b/gdb/ada-exp.y
@@ -1456,8 +1456,9 @@ type_system_address (struct parser_state *par_state)
   return  type != NULL ? type : parse_type (par_state)->builtin_data_ptr;
 }
 
+void _initialize_ada_exp ();
 void
-_initialize_ada_exp (void)
+_initialize_ada_exp ()
 {
   obstack_init (&temp_parse_space);
 }
diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 334f2917e3dd..c5b5fdf169f5 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -14229,8 +14229,9 @@ ada_free_objfile_observer (struct objfile *objfile)
   ada_clear_symbol_cache ();
 }
 
+void _initialize_ada_language ();
 void
-_initialize_ada_language (void)
+_initialize_ada_language ()
 {
   initialize_ada_catchpoint_ops ();
 
diff --git a/gdb/ada-tasks.c b/gdb/ada-tasks.c
index 0b7a8eb4ad46..0a81c3c6922e 100644
--- a/gdb/ada-tasks.c
+++ b/gdb/ada-tasks.c
@@ -1455,8 +1455,9 @@ ada_tasks_new_objfile_observer (struct objfile *objfile)
       ada_tasks_invalidate_inferior_data (inf);
 }
 
+void _initialize_tasks ();
 void
-_initialize_tasks (void)
+_initialize_tasks ()
 {
   /* Attach various observers.  */
   gdb::observers::normal_stop.attach (ada_tasks_normal_stop_observer);
diff --git a/gdb/agent.c b/gdb/agent.c
index ccf8c44a3612..77ece234996e 100644
--- a/gdb/agent.c
+++ b/gdb/agent.c
@@ -74,8 +74,9 @@ agent_new_objfile (struct objfile *objfile)
   agent_look_up_symbols (objfile);
 }
 
+void _initialize_agent ();
 void
-_initialize_agent (void)
+_initialize_agent ()
 {
   gdb::observers::new_objfile.attach (agent_new_objfile);
 
diff --git a/gdb/aix-thread.c b/gdb/aix-thread.c
index b9b25d5e3cb6..f2bd05fef22b 100644
--- a/gdb/aix-thread.c
+++ b/gdb/aix-thread.c
@@ -1834,8 +1834,9 @@ aix_thread_target::get_ada_task_ptid (long lwp, long thread)
 /* Module startup initialization function, automagically called by
    init.c.  */
 
+void _initialize_aix_thread ();
 void
-_initialize_aix_thread (void)
+_initialize_aix_thread ()
 {
   /* Notice when object files get loaded and unloaded.  */
   gdb::observers::new_objfile.attach (new_objfile);
diff --git a/gdb/alpha-bsd-nat.c b/gdb/alpha-bsd-nat.c
index 71ae8e1419c4..747c3c5abb68 100644
--- a/gdb/alpha-bsd-nat.c
+++ b/gdb/alpha-bsd-nat.c
@@ -192,8 +192,9 @@ alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 }
 
 
+void _initialize_alphabsd_nat ();
 void
-_initialize_alphabsd_nat (void)
+_initialize_alphabsd_nat ()
 {
   add_inf_child_target (&the_alpha_bsd_nat_target);
 
diff --git a/gdb/alpha-linux-nat.c b/gdb/alpha-linux-nat.c
index 4f881532cebe..5fd7a932ce13 100644
--- a/gdb/alpha-linux-nat.c
+++ b/gdb/alpha-linux-nat.c
@@ -101,8 +101,9 @@ alpha_linux_nat_target::register_u_offset (struct gdbarch *gdbarch,
     return FPR_BASE + regno - gdbarch_fp0_regnum (gdbarch);
 }
 
+void _initialize_alpha_linux_nat ();
 void
-_initialize_alpha_linux_nat (void)
+_initialize_alpha_linux_nat ()
 {
   linux_target = &the_alpha_linux_nat_target;
   add_inf_child_target (&the_alpha_linux_nat_target);
diff --git a/gdb/alpha-linux-tdep.c b/gdb/alpha-linux-tdep.c
index aa0342164f2e..589b89567053 100644
--- a/gdb/alpha-linux-tdep.c
+++ b/gdb/alpha-linux-tdep.c
@@ -389,8 +389,9 @@ alpha_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 				    alpha_linux_gdb_signal_to_target);
 }
 
+void _initialize_alpha_linux_tdep ();
 void
-_initialize_alpha_linux_tdep (void)
+_initialize_alpha_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_LINUX,
                           alpha_linux_init_abi);
diff --git a/gdb/alpha-nbsd-tdep.c b/gdb/alpha-nbsd-tdep.c
index 8e8c45341922..ab9240e35daa 100644
--- a/gdb/alpha-nbsd-tdep.c
+++ b/gdb/alpha-nbsd-tdep.c
@@ -278,8 +278,9 @@ alphanbsd_init_abi (struct gdbarch_info info,
 }
 
 
+void _initialize_alphanbsd_tdep ();
 void
-_initialize_alphanbsd_tdep (void)
+_initialize_alphanbsd_tdep ()
 {
   /* Even though NetBSD/alpha used ELF since day one, it used the
      traditional a.out-style core dump format before NetBSD 1.6, but
diff --git a/gdb/alpha-obsd-tdep.c b/gdb/alpha-obsd-tdep.c
index 340e804b4c77..99d9855c7c26 100644
--- a/gdb/alpha-obsd-tdep.c
+++ b/gdb/alpha-obsd-tdep.c
@@ -126,8 +126,9 @@ alphaobsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
 }
 
 
+void _initialize_alphaobsd_tdep ();
 void
-_initialize_alphaobsd_tdep (void)
+_initialize_alphaobsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OPENBSD,
                           alphaobsd_init_abi);
diff --git a/gdb/alpha-tdep.c b/gdb/alpha-tdep.c
index 25acd18a1f83..390f865edad2 100644
--- a/gdb/alpha-tdep.c
+++ b/gdb/alpha-tdep.c
@@ -1821,8 +1821,9 @@ alpha_dwarf2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
 }
 
+void _initialize_alpha_tdep ();
 void
-_initialize_alpha_tdep (void)
+_initialize_alpha_tdep ()
 {
 
   gdbarch_register (bfd_arch_alpha, alpha_gdbarch_init, NULL);
diff --git a/gdb/amd64-darwin-tdep.c b/gdb/amd64-darwin-tdep.c
index 912ef3182854..5e8f352ffc9c 100644
--- a/gdb/amd64-darwin-tdep.c
+++ b/gdb/amd64-darwin-tdep.c
@@ -116,8 +116,9 @@ x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_solib_ops (gdbarch, &darwin_so_ops);
 }
 
+void _initialize_amd64_darwin_tdep ();
 void
-_initialize_amd64_darwin_tdep (void)
+_initialize_amd64_darwin_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
                           GDB_OSABI_DARWIN, x86_darwin_init_abi_64);
diff --git a/gdb/amd64-dicos-tdep.c b/gdb/amd64-dicos-tdep.c
index e3aa5a29d903..687d1f26cba9 100644
--- a/gdb/amd64-dicos-tdep.c
+++ b/gdb/amd64-dicos-tdep.c
@@ -46,8 +46,9 @@ amd64_dicos_osabi_sniffer (bfd *abfd)
   return GDB_OSABI_UNKNOWN;
 }
 
+void _initialize_amd64_dicos_tdep ();
 void
-_initialize_amd64_dicos_tdep (void)
+_initialize_amd64_dicos_tdep ()
 {
   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 				  amd64_dicos_osabi_sniffer);
diff --git a/gdb/amd64-fbsd-nat.c b/gdb/amd64-fbsd-nat.c
index 662008bf6811..7f85b6a44894 100644
--- a/gdb/amd64-fbsd-nat.c
+++ b/gdb/amd64-fbsd-nat.c
@@ -209,8 +209,9 @@ amd64_fbsd_nat_target::supports_stopped_by_hw_breakpoint ()
 }
 #endif
 
+void _initialize_amd64fbsd_nat ();
 void
-_initialize_amd64fbsd_nat (void)
+_initialize_amd64fbsd_nat ()
 {
   int offset;
 
diff --git a/gdb/amd64-fbsd-tdep.c b/gdb/amd64-fbsd-tdep.c
index b0639ed95a67..7c3e33644e10 100644
--- a/gdb/amd64-fbsd-tdep.c
+++ b/gdb/amd64-fbsd-tdep.c
@@ -270,8 +270,9 @@ amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 					amd64fbsd_get_thread_local_address);
 }
 
+void _initialize_amd64fbsd_tdep ();
 void
-_initialize_amd64fbsd_tdep (void)
+_initialize_amd64fbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 			  GDB_OSABI_FREEBSD, amd64fbsd_init_abi);
diff --git a/gdb/amd64-linux-nat.c b/gdb/amd64-linux-nat.c
index 27748ff98600..63fc84b0b143 100644
--- a/gdb/amd64-linux-nat.c
+++ b/gdb/amd64-linux-nat.c
@@ -478,8 +478,9 @@ amd64_linux_nat_target::low_siginfo_fixup (siginfo_t *ptrace,
     return false;
 }
 
+void _initialize_amd64_linux_nat ();
 void
-_initialize_amd64_linux_nat (void)
+_initialize_amd64_linux_nat ()
 {
   amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset;
   amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS;
diff --git a/gdb/amd64-linux-tdep.c b/gdb/amd64-linux-tdep.c
index 07820a055970..44ecb4e0b338 100644
--- a/gdb/amd64-linux-tdep.c
+++ b/gdb/amd64-linux-tdep.c
@@ -2272,8 +2272,9 @@ amd64_x32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 }
 
+void _initialize_amd64_linux_tdep ();
 void
-_initialize_amd64_linux_tdep (void)
+_initialize_amd64_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 			  GDB_OSABI_LINUX, amd64_linux_init_abi);
diff --git a/gdb/amd64-nbsd-nat.c b/gdb/amd64-nbsd-nat.c
index 1d97cc59571e..7a4c00573526 100644
--- a/gdb/amd64-nbsd-nat.c
+++ b/gdb/amd64-nbsd-nat.c
@@ -56,8 +56,9 @@ static int amd64nbsd32_r_reg_offset[] =
 
 static amd64_bsd_nat_target<nbsd_nat_target> the_amd64_nbsd_nat_target;
 
+void _initialize_amd64nbsd_nat ();
 void
-_initialize_amd64nbsd_nat (void)
+_initialize_amd64nbsd_nat ()
 {
   amd64_native_gregset32_reg_offset = amd64nbsd32_r_reg_offset;
   amd64_native_gregset32_num_regs = ARRAY_SIZE (amd64nbsd32_r_reg_offset);
diff --git a/gdb/amd64-nbsd-tdep.c b/gdb/amd64-nbsd-tdep.c
index 65f587cf827d..89d07236b857 100644
--- a/gdb/amd64-nbsd-tdep.c
+++ b/gdb/amd64-nbsd-tdep.c
@@ -120,8 +120,9 @@ amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 }
 
+void _initialize_amd64nbsd_tdep ();
 void
-_initialize_amd64nbsd_tdep (void)
+_initialize_amd64nbsd_tdep ()
 {
   /* The NetBSD/amd64 native dependent code makes this assumption.  */
   gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);
diff --git a/gdb/amd64-obsd-nat.c b/gdb/amd64-obsd-nat.c
index f0d8ecf39523..a19f7a19fec8 100644
--- a/gdb/amd64-obsd-nat.c
+++ b/gdb/amd64-obsd-nat.c
@@ -128,8 +128,9 @@ amd64obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 
 static amd64_bsd_nat_target<obsd_nat_target> the_amd64_obsd_nat_target;
 
+void _initialize_amd64obsd_nat ();
 void
-_initialize_amd64obsd_nat (void)
+_initialize_amd64obsd_nat ()
 {
   amd64_native_gregset32_reg_offset = amd64obsd32_r_reg_offset;
   amd64_native_gregset32_num_regs = ARRAY_SIZE (amd64obsd32_r_reg_offset);
diff --git a/gdb/amd64-obsd-tdep.c b/gdb/amd64-obsd-tdep.c
index fb3366589095..d5f84fcc5f0c 100644
--- a/gdb/amd64-obsd-tdep.c
+++ b/gdb/amd64-obsd-tdep.c
@@ -448,8 +448,9 @@ amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   frame_unwind_prepend_unwinder (gdbarch, &amd64obsd_trapframe_unwind);
 }
 
+void _initialize_amd64obsd_tdep ();
 void
-_initialize_amd64obsd_tdep (void)
+_initialize_amd64obsd_tdep ()
 {
   /* The OpenBSD/amd64 native dependent code makes this assumption.  */
   gdb_assert (ARRAY_SIZE (amd64obsd_r_reg_offset) == AMD64_NUM_GREGS);
diff --git a/gdb/amd64-sol2-tdep.c b/gdb/amd64-sol2-tdep.c
index 86f9f60e28f1..8d8600b2cad8 100644
--- a/gdb/amd64-sol2-tdep.c
+++ b/gdb/amd64-sol2-tdep.c
@@ -118,8 +118,9 @@ amd64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);
 }
 
+void _initialize_amd64_sol2_tdep ();
 void
-_initialize_amd64_sol2_tdep (void)
+_initialize_amd64_sol2_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 			  GDB_OSABI_SOLARIS, amd64_sol2_init_abi);
diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index 157a5d0c3348..f5ec40f37e8c 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -3334,8 +3334,9 @@ amd64_target_description (uint64_t xcr0, bool segments)
   return *tdesc;
 }
 
+void _initialize_amd64_tdep ();
 void
-_initialize_amd64_tdep (void)
+_initialize_amd64_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, GDB_OSABI_NONE,
  			  amd64_none_init_abi);
diff --git a/gdb/amd64-windows-nat.c b/gdb/amd64-windows-nat.c
index 67b869110317..5b2c261aba75 100644
--- a/gdb/amd64-windows-nat.c
+++ b/gdb/amd64-windows-nat.c
@@ -95,8 +95,9 @@ amd64_windows_segment_register_p (int regnum)
   return regnum >= AMD64_CS_REGNUM && regnum <= AMD64_GS_REGNUM;
 }
 
+void _initialize_amd64_windows_nat ();
 void
-_initialize_amd64_windows_nat (void)
+_initialize_amd64_windows_nat ()
 {
   windows_set_context_register_offsets (mappings);
   windows_set_segment_register_p (amd64_windows_segment_register_p);
diff --git a/gdb/amd64-windows-tdep.c b/gdb/amd64-windows-tdep.c
index e1e777c4355e..b2155f347a50 100644
--- a/gdb/amd64-windows-tdep.c
+++ b/gdb/amd64-windows-tdep.c
@@ -1245,8 +1245,9 @@ amd64_windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_auto_wide_charset (gdbarch, amd64_windows_auto_wide_charset);
 }
 
+void _initialize_amd64_windows_tdep ();
 void
-_initialize_amd64_windows_tdep (void)
+_initialize_amd64_windows_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, GDB_OSABI_CYGWIN,
                           amd64_windows_init_abi);
diff --git a/gdb/annotate.c b/gdb/annotate.c
index 28dd23196fd6..cf9e88cee512 100644
--- a/gdb/annotate.c
+++ b/gdb/annotate.c
@@ -614,8 +614,9 @@ breakpoint_changed (struct breakpoint *b)
   annotate_breakpoints_invalid ();
 }
 
+void _initialize_annotate ();
 void
-_initialize_annotate (void)
+_initialize_annotate ()
 {
   gdb::observers::breakpoint_created.attach (breakpoint_changed);
   gdb::observers::breakpoint_deleted.attach (breakpoint_changed);
diff --git a/gdb/arc-newlib-tdep.c b/gdb/arc-newlib-tdep.c
index 18e07d618856..70e2c5b0546c 100644
--- a/gdb/arc-newlib-tdep.c
+++ b/gdb/arc-newlib-tdep.c
@@ -56,8 +56,9 @@ arc_newlib_osabi_sniffer (bfd *abfd)
     return GDB_OSABI_UNKNOWN;
 }
 
+void _initialize_arc_newlib_tdep ();
 void
-_initialize_arc_newlib_tdep (void)
+_initialize_arc_newlib_tdep ()
 {
   gdbarch_register_osabi_sniffer (bfd_arch_arc, bfd_target_elf_flavour,
 				  arc_newlib_osabi_sniffer);
diff --git a/gdb/arc-tdep.c b/gdb/arc-tdep.c
index 021cbb008e8a..13da0226f786 100644
--- a/gdb/arc-tdep.c
+++ b/gdb/arc-tdep.c
@@ -2145,8 +2145,9 @@ dump_arc_instruction_command (const char *args, int from_tty)
   arc_insn_dump (insn);
 }
 
+void _initialize_arc_tdep ();
 void
-_initialize_arc_tdep (void)
+_initialize_arc_tdep ()
 {
   gdbarch_register (bfd_arch_arc, arc_gdbarch_init, arc_dump_tdep);
 
diff --git a/gdb/arch-utils.c b/gdb/arch-utils.c
index 55b115c13550..92d7153ccb26 100644
--- a/gdb/arch-utils.c
+++ b/gdb/arch-utils.c
@@ -1004,8 +1004,9 @@ default_get_pc_address_flags (frame_info *frame, CORE_ADDR pc)
   return "";
 }
 
+void _initialize_gdbarch_utils ();
 void
-_initialize_gdbarch_utils (void)
+_initialize_gdbarch_utils ()
 {
   add_setshow_enum_cmd ("endian", class_support,
 			endian_enum, &set_endian_string, 
diff --git a/gdb/arm-fbsd-nat.c b/gdb/arm-fbsd-nat.c
index 14160be0180d..3470f817a796 100644
--- a/gdb/arm-fbsd-nat.c
+++ b/gdb/arm-fbsd-nat.c
@@ -143,8 +143,9 @@ arm_fbsd_nat_target::read_description ()
   return desc;
 }
 
+void _initialize_arm_fbsd_nat ();
 void
-_initialize_arm_fbsd_nat (void)
+_initialize_arm_fbsd_nat ()
 {
   add_inf_child_target (&the_arm_fbsd_nat_target);
 }
diff --git a/gdb/arm-fbsd-tdep.c b/gdb/arm-fbsd-tdep.c
index ec0e9d58230b..417a805e672f 100644
--- a/gdb/arm-fbsd-tdep.c
+++ b/gdb/arm-fbsd-tdep.c
@@ -235,8 +235,9 @@ arm_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
 }
 
+void _initialize_arm_fbsd_tdep ();
 void
-_initialize_arm_fbsd_tdep (void)
+_initialize_arm_fbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_FREEBSD,
 			  arm_fbsd_init_abi);
diff --git a/gdb/arm-linux-nat.c b/gdb/arm-linux-nat.c
index 0b27281783f0..8bbaed5cf886 100644
--- a/gdb/arm-linux-nat.c
+++ b/gdb/arm-linux-nat.c
@@ -1299,8 +1299,9 @@ arm_linux_nat_target::low_new_fork (struct lwp_info *parent, pid_t child_pid)
   *child_state = *parent_state;
 }
 
+void _initialize_arm_linux_nat ();
 void
-_initialize_arm_linux_nat (void)
+_initialize_arm_linux_nat ()
 {
   /* Register the target.  */
   linux_target = &the_arm_linux_nat_target;
diff --git a/gdb/arm-linux-tdep.c b/gdb/arm-linux-tdep.c
index 8bfcea6c52f1..363e67161c84 100644
--- a/gdb/arm-linux-tdep.c
+++ b/gdb/arm-linux-tdep.c
@@ -2001,8 +2001,9 @@ arm_linux_init_abi (struct gdbarch_info info,
   set_gdbarch_gcc_target_options (gdbarch, arm_linux_gcc_target_options);
 }
 
+void _initialize_arm_linux_tdep ();
 void
-_initialize_arm_linux_tdep (void)
+_initialize_arm_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_LINUX,
 			  arm_linux_init_abi);
diff --git a/gdb/arm-nbsd-nat.c b/gdb/arm-nbsd-nat.c
index 4dacd577ba1c..1d058a99ac1a 100644
--- a/gdb/arm-nbsd-nat.c
+++ b/gdb/arm-nbsd-nat.c
@@ -444,8 +444,9 @@ static struct core_fns arm_netbsd_elfcore_fns =
   NULL
 };
 
+void _initialize_arm_netbsd_nat ();
 void
-_initialize_arm_netbsd_nat (void)
+_initialize_arm_netbsd_nat ()
 {
   add_inf_child_target (&the_arm_netbsd_nat_target);
 
diff --git a/gdb/arm-nbsd-tdep.c b/gdb/arm-nbsd-tdep.c
index 397d21d7f564..2642024022ee 100644
--- a/gdb/arm-nbsd-tdep.c
+++ b/gdb/arm-nbsd-tdep.c
@@ -85,8 +85,9 @@ arm_netbsd_elf_init_abi (struct gdbarch_info info,
     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 }
 
+void _initialize_arm_netbsd_tdep ();
 void
-_initialize_arm_netbsd_tdep (void)
+_initialize_arm_netbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD,
                           arm_netbsd_elf_init_abi);
diff --git a/gdb/arm-obsd-tdep.c b/gdb/arm-obsd-tdep.c
index 3ef0957f9d5f..b3b1e2f7e66b 100644
--- a/gdb/arm-obsd-tdep.c
+++ b/gdb/arm-obsd-tdep.c
@@ -115,8 +115,9 @@ armobsd_init_abi (struct gdbarch_info info,
     }
 }
 
+void _initialize_armobsd_tdep ();
 void
-_initialize_armobsd_tdep (void)
+_initialize_armobsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD,
 			  armobsd_init_abi);
diff --git a/gdb/arm-pikeos-tdep.c b/gdb/arm-pikeos-tdep.c
index 64c3640f06bb..a993b90e5de7 100644
--- a/gdb/arm-pikeos-tdep.c
+++ b/gdb/arm-pikeos-tdep.c
@@ -81,8 +81,9 @@ arm_pikeos_osabi_sniffer (bfd *abfd)
     return GDB_OSABI_UNKNOWN;
 }
 
+void _initialize_arm_pikeos_tdep ();
 void
-_initialize_arm_pikeos_tdep (void)
+_initialize_arm_pikeos_tdep ()
 {
   /* Register the sniffer for the PikeOS targets.  */
   gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_elf_flavour,
diff --git a/gdb/arm-symbian-tdep.c b/gdb/arm-symbian-tdep.c
index 6d8236c24222..b17f9c60eb94 100644
--- a/gdb/arm-symbian-tdep.c
+++ b/gdb/arm-symbian-tdep.c
@@ -119,8 +119,9 @@ arm_symbian_osabi_sniffer (bfd *abfd)
   return GDB_OSABI_SYMBIAN;
 }
 
+void _initialize_arm_symbian_tdep ();
 void
-_initialize_arm_symbian_tdep (void)
+_initialize_arm_symbian_tdep ()
 {
   gdbarch_register_osabi_sniffer (bfd_arch_arm,
 				  bfd_target_elf_flavour,
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index 91701c25d205..0e72bcc651a4 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -9479,8 +9479,9 @@ static void arm_record_test (void);
 }
 #endif
 
+void _initialize_arm_tdep ();
 void
-_initialize_arm_tdep (void)
+_initialize_arm_tdep ()
 {
   long length;
   int i, j;
diff --git a/gdb/arm-wince-tdep.c b/gdb/arm-wince-tdep.c
index 188174ab9446..5971b29bd596 100644
--- a/gdb/arm-wince-tdep.c
+++ b/gdb/arm-wince-tdep.c
@@ -154,8 +154,9 @@ arm_wince_osabi_sniffer (bfd *abfd)
   return GDB_OSABI_UNKNOWN;
 }
 
+void _initialize_arm_wince_tdep ();
 void
-_initialize_arm_wince_tdep (void)
+_initialize_arm_wince_tdep ()
 {
   gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_coff_flavour,
                                   arm_wince_osabi_sniffer);
diff --git a/gdb/auto-load.c b/gdb/auto-load.c
index 5a9f47f0785a..36ec0d11b403 100644
--- a/gdb/auto-load.c
+++ b/gdb/auto-load.c
@@ -1530,8 +1530,9 @@ found and/or loaded."),
   return &retval;
 }
 
+void _initialize_auto_load ();
 void
-_initialize_auto_load (void)
+_initialize_auto_load ()
 {
   struct cmd_list_element *cmd;
   char *scripts_directory_help, *gdb_name_help, *python_name_help;
diff --git a/gdb/auxv.c b/gdb/auxv.c
index e8925cf70e70..eb1233527e50 100644
--- a/gdb/auxv.c
+++ b/gdb/auxv.c
@@ -546,8 +546,9 @@ info_auxv_command (const char *cmd, int from_tty)
     }
 }
 
+void _initialize_auxv ();
 void
-_initialize_auxv (void)
+_initialize_auxv ()
 {
   add_info ("auxv", info_auxv_command,
 	    _("Display the inferior's auxiliary vector.\n\
diff --git a/gdb/avr-tdep.c b/gdb/avr-tdep.c
index 381c7903fc60..d823c87a3cf8 100644
--- a/gdb/avr-tdep.c
+++ b/gdb/avr-tdep.c
@@ -1616,8 +1616,9 @@ avr_io_reg_read_command (const char *args, int from_tty)
     }
 }
 
+void _initialize_avr_tdep ();
 void
-_initialize_avr_tdep (void)
+_initialize_avr_tdep ()
 {
   register_gdbarch_init (bfd_arch_avr, avr_gdbarch_init);
 
diff --git a/gdb/ax-gdb.c b/gdb/ax-gdb.c
index a77c770aad89..14765bd1d865 100644
--- a/gdb/ax-gdb.c
+++ b/gdb/ax-gdb.c
@@ -2743,8 +2743,9 @@ maint_agent_printf_command (const char *cmdrest, int from_tty)
 
 /* Initialization code.  */
 
+void _initialize_ax_gdb ();
 void
-_initialize_ax_gdb (void)
+_initialize_ax_gdb ()
 {
   add_cmd ("agent", class_maintenance, agent_command,
 	   _("\
diff --git a/gdb/bfin-linux-tdep.c b/gdb/bfin-linux-tdep.c
index 147223b283e8..f77f099ccb46 100644
--- a/gdb/bfin-linux-tdep.c
+++ b/gdb/bfin-linux-tdep.c
@@ -161,8 +161,9 @@ bfin_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
                                   bfin_linux_get_syscall_number);
 }
 
+void _initialize_bfin_linux_tdep ();
 void
-_initialize_bfin_linux_tdep (void)
+_initialize_bfin_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_bfin, 0, GDB_OSABI_LINUX,
                           bfin_linux_init_abi);
diff --git a/gdb/bfin-tdep.c b/gdb/bfin-tdep.c
index cb5650d5d93b..23591d4a5f0a 100644
--- a/gdb/bfin-tdep.c
+++ b/gdb/bfin-tdep.c
@@ -833,8 +833,9 @@ bfin_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_bfin_tdep ();
 void
-_initialize_bfin_tdep (void)
+_initialize_bfin_tdep ()
 {
   register_gdbarch_init (bfd_arch_bfin, bfin_gdbarch_init);
 }
diff --git a/gdb/break-catch-sig.c b/gdb/break-catch-sig.c
index c645746aa834..e3e6f6fd8c9d 100644
--- a/gdb/break-catch-sig.c
+++ b/gdb/break-catch-sig.c
@@ -424,8 +424,9 @@ initialize_signal_catchpoint_ops (void)
   ops->explains_signal = signal_catchpoint_explains_signal;
 }
 
+void _initialize_break_catch_sig ();
 void
-_initialize_break_catch_sig (void)
+_initialize_break_catch_sig ()
 {
   initialize_signal_catchpoint_ops ();
 
diff --git a/gdb/break-catch-syscall.c b/gdb/break-catch-syscall.c
index 553c01cb3203..7e98a293900e 100644
--- a/gdb/break-catch-syscall.c
+++ b/gdb/break-catch-syscall.c
@@ -599,8 +599,9 @@ initialize_syscall_catchpoint_ops (void)
   ops->print_recreate = print_recreate_catch_syscall;
 }
 
+void _initialize_break_catch_syscall ();
 void
-_initialize_break_catch_syscall (void)
+_initialize_break_catch_syscall ()
 {
   initialize_syscall_catchpoint_ops ();
 
diff --git a/gdb/break-catch-throw.c b/gdb/break-catch-throw.c
index 87b38b3b6017..07dcc7dc0e73 100644
--- a/gdb/break-catch-throw.c
+++ b/gdb/break-catch-throw.c
@@ -532,8 +532,9 @@ initialize_throw_catchpoint_ops (void)
   ops->allocate_location = allocate_location_exception_catchpoint;
 }
 
+void _initialize_break_catch_throw ();
 void
-_initialize_break_catch_throw (void)
+_initialize_break_catch_throw ()
 {
   initialize_throw_catchpoint_ops ();
 
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index 5b734abf1c16..a7a378131a9b 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -15409,8 +15409,9 @@ static struct cmd_list_element *enablebreaklist = NULL;
 
 cmd_list_element *commands_cmd_element = nullptr;
 
+void _initialize_breakpoint ();
 void
-_initialize_breakpoint (void)
+_initialize_breakpoint ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/bsd-uthread.c b/gdb/bsd-uthread.c
index a8622a8b0e47..15d538c16db5 100644
--- a/gdb/bsd-uthread.c
+++ b/gdb/bsd-uthread.c
@@ -544,8 +544,9 @@ bsd_uthread_target::pid_to_str (ptid_t ptid)
   return normal_pid_to_str (ptid);
 }
 
+void _initialize_bsd_uthread ();
 void
-_initialize_bsd_uthread (void)
+_initialize_bsd_uthread ()
 {
   bsd_uthread_data = gdbarch_data_register_pre_init (bsd_uthread_init);
 
diff --git a/gdb/btrace.c b/gdb/btrace.c
index a91a67681302..0c7becd34906 100644
--- a/gdb/btrace.c
+++ b/gdb/btrace.c
@@ -3471,8 +3471,9 @@ show_maint_btrace_pt_skip_pad  (struct ui_file *file, int from_tty,
 
 /* Initialize btrace maintenance commands.  */
 
+void _initialize_btrace ();
 void
-_initialize_btrace (void)
+_initialize_btrace ()
 {
   add_cmd ("btrace", class_maintenance, maint_info_btrace_cmd,
 	   _("Info about branch tracing data."), &maintenanceinfolist);
diff --git a/gdb/charset.c b/gdb/charset.c
index 1af43fffa058..480ed366a492 100644
--- a/gdb/charset.c
+++ b/gdb/charset.c
@@ -994,8 +994,9 @@ intermediate_encoding (void)
 
 #endif /* USE_INTERMEDIATE_ENCODING_FUNCTION */
 
+void _initialize_charset ();
 void
-_initialize_charset (void)
+_initialize_charset ()
 {
   /* The first element is always "auto".  */
   charsets.charsets.push_back (xstrdup ("auto"));
diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index c2ba3a4238ab..6f324410e169 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -2113,8 +2113,9 @@ gdb_maint_setting_str_internal_fn (struct gdbarch *gdbarch,
 				 gdbarch);
 }
 
+void _initialize_cli_cmds ();
 void
-_initialize_cli_cmds (void)
+_initialize_cli_cmds ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/cli/cli-dump.c b/gdb/cli/cli-dump.c
index 182e6c71667b..ae047ac75de8 100644
--- a/gdb/cli/cli-dump.c
+++ b/gdb/cli/cli-dump.c
@@ -622,8 +622,9 @@ binary_append_command (const char *cmd, int from_tty)
 	     gdb_stdout);
 }
 
+void _initialize_cli_dump ();
 void
-_initialize_cli_dump (void)
+_initialize_cli_dump ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/cli/cli-interp.c b/gdb/cli/cli-interp.c
index acec367b5f3d..8cdd2d21c007 100644
--- a/gdb/cli/cli-interp.c
+++ b/gdb/cli/cli-interp.c
@@ -467,8 +467,9 @@ cli_interp_factory (const char *name)
 
 /* Standard gdb initialization hook.  */
 
+void _initialize_cli_interp ();
 void
-_initialize_cli_interp (void)
+_initialize_cli_interp ()
 {
   interp_factory_register (INTERP_CONSOLE, cli_interp_factory);
 
diff --git a/gdb/cli/cli-logging.c b/gdb/cli/cli-logging.c
index 247334cb52da..d7c1b779bfe4 100644
--- a/gdb/cli/cli-logging.c
+++ b/gdb/cli/cli-logging.c
@@ -202,8 +202,9 @@ show_logging_command (const char *args, int from_tty)
     printf_unfiltered (_("Debug output will be logged and displayed.\n"));
 }
 
+void _initialize_cli_logging ();
 void
-_initialize_cli_logging (void)
+_initialize_cli_logging ()
 {
   static struct cmd_list_element *set_logging_cmdlist, *show_logging_cmdlist;
 
diff --git a/gdb/cli/cli-script.c b/gdb/cli/cli-script.c
index f70ebed20210..c9d23789068d 100644
--- a/gdb/cli/cli-script.c
+++ b/gdb/cli/cli-script.c
@@ -1667,8 +1667,9 @@ show_user_1 (struct cmd_list_element *c, const char *prefix, const char *name,
 
 }
 
+void _initialize_cli_script ();
 void
-_initialize_cli_script (void)
+_initialize_cli_script ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/cli/cli-style.c b/gdb/cli/cli-style.c
index f3d98ae40910..917a7f6c8fe5 100644
--- a/gdb/cli/cli-style.c
+++ b/gdb/cli/cli-style.c
@@ -313,6 +313,7 @@ set_style_name (const char *name)
   return result;
 }
 
+void _initialize_cli_style ();
 void
 _initialize_cli_style ()
 {
diff --git a/gdb/coff-pe-read.c b/gdb/coff-pe-read.c
index b7f7b81ca882..047f2e5ea4c0 100644
--- a/gdb/coff-pe-read.c
+++ b/gdb/coff-pe-read.c
@@ -691,8 +691,9 @@ show_debug_coff_pe_read (struct ui_file *file, int from_tty,
 
 /* Adds "Set/show debug coff_pe_read" commands.  */
 
+void _initialize_coff_pe_read ();
 void
-_initialize_coff_pe_read (void)
+_initialize_coff_pe_read ()
 {
   add_setshow_zuinteger_cmd ("coff-pe-read", class_maintenance,
 			     &debug_coff_pe_read,
diff --git a/gdb/coffread.c b/gdb/coffread.c
index 60efb59b1a34..227cf866b844 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -2188,8 +2188,9 @@ static const struct sym_fns coff_sym_fns =
   &psym_functions
 };
 
+void _initialize_coffread ();
 void
-_initialize_coffread (void)
+_initialize_coffread ()
 {
   add_symtab_fns (bfd_target_coff_flavour, &coff_sym_fns);
 
diff --git a/gdb/compile/compile-cplus-types.c b/gdb/compile/compile-cplus-types.c
index 89c3c7234d42..a179bd6fe527 100644
--- a/gdb/compile/compile-cplus-types.c
+++ b/gdb/compile/compile-cplus-types.c
@@ -1404,6 +1404,7 @@ gcc_cp_plugin::pop_binding_level (const char *debug_name)
   return pop_binding_level ();
 }
 
+void _initialize_compile_cplus_types ();
 void
 _initialize_compile_cplus_types ()
 {
diff --git a/gdb/compile/compile.c b/gdb/compile/compile.c
index a5978b457994..8d134d9cf18e 100644
--- a/gdb/compile/compile.c
+++ b/gdb/compile/compile.c
@@ -957,8 +957,9 @@ compile_instance::compile (const char *filename, int verbose_level)
 /* See compile.h.  */
 cmd_list_element *compile_cmd_element = nullptr;
 
+void _initialize_compile ();
 void
-_initialize_compile (void)
+_initialize_compile ()
 {
   struct cmd_list_element *c = NULL;
 
diff --git a/gdb/complaints.c b/gdb/complaints.c
index bda5a998e0bd..45f3e5027d87 100644
--- a/gdb/complaints.c
+++ b/gdb/complaints.c
@@ -74,8 +74,9 @@ complaints_show_value (struct ui_file *file, int from_tty,
 		    value);
 }
 
+void _initialize_complaints ();
 void
-_initialize_complaints (void)
+_initialize_complaints ()
 {
   add_setshow_zinteger_cmd ("complaints", class_support, 
 			    &stop_whining, _("\
diff --git a/gdb/completer.c b/gdb/completer.c
index 3a17445004d9..619fb8a0285f 100644
--- a/gdb/completer.c
+++ b/gdb/completer.c
@@ -2935,8 +2935,9 @@ gdb_display_match_list (char **matches, int len, int max,
     }
 }
 
+void _initialize_completer ();
 void
-_initialize_completer (void)
+_initialize_completer ()
 {
   add_setshow_zuinteger_unlimited_cmd ("max-completions", no_class,
 				       &max_completions, _("\
diff --git a/gdb/copying.c b/gdb/copying.c
index 8e4077ccb910..63183450a0e0 100644
--- a/gdb/copying.c
+++ b/gdb/copying.c
@@ -640,8 +640,9 @@ show_warranty_command (const char *ignore, int from_tty)
   printf_filtered ("\n");
 }
 
+void _initialize_copying ();
 void
-_initialize_copying (void)
+_initialize_copying ()
 {
   add_cmd ("copying", no_set_class, show_copying_command,
 	   _("Conditions for redistributing copies of GDB."),
diff --git a/gdb/corefile.c b/gdb/corefile.c
index 498628c5af6a..3b9f8c760527 100644
--- a/gdb/corefile.c
+++ b/gdb/corefile.c
@@ -478,8 +478,9 @@ set_gnutarget (const char *newtarget)
   set_gnutarget_command (NULL, 0, NULL);
 }
 
+void _initialize_core ();
 void
-_initialize_core (void)
+_initialize_core ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/corelow.c b/gdb/corelow.c
index c53bf1df8fd8..f162a1b7de0b 100644
--- a/gdb/corelow.c
+++ b/gdb/corelow.c
@@ -994,8 +994,9 @@ core_target::info_proc (const char *args, enum info_proc_what request)
   return true;
 }
 
+void _initialize_corelow ();
 void
-_initialize_corelow (void)
+_initialize_corelow ()
 {
   add_target (core_target_info, core_target_open, filename_completer);
 }
diff --git a/gdb/cp-abi.c b/gdb/cp-abi.c
index fd967c3096b8..6997a7bdbe9b 100644
--- a/gdb/cp-abi.c
+++ b/gdb/cp-abi.c
@@ -391,8 +391,9 @@ show_cp_abi_cmd (const char *args, int from_tty)
   uiout->text (").\n");
 }
 
+void _initialize_cp_abi ();
 void
-_initialize_cp_abi (void)
+_initialize_cp_abi ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/cp-namespace.c b/gdb/cp-namespace.c
index ad7e3bcc3b74..3a2100d84cf5 100644
--- a/gdb/cp-namespace.c
+++ b/gdb/cp-namespace.c
@@ -1061,8 +1061,9 @@ maintenance_cplus_namespace (const char *args, int from_tty)
   printf_unfiltered (_("The `maint namespace' command was removed.\n"));
 }
 
+void _initialize_cp_namespace ();
 void
-_initialize_cp_namespace (void)
+_initialize_cp_namespace ()
 {
   struct cmd_list_element *cmd;
 
diff --git a/gdb/cp-support.c b/gdb/cp-support.c
index c1d62f1711ef..91e7d2ddc686 100644
--- a/gdb/cp-support.c
+++ b/gdb/cp-support.c
@@ -2163,8 +2163,9 @@ info_vtbl_command (const char *arg, int from_tty)
   cplus_print_vtable (value);
 }
 
+void _initialize_cp_support ();
 void
-_initialize_cp_support (void)
+_initialize_cp_support ()
 {
   add_prefix_cmd ("cplus", class_maintenance,
 		  maint_cplus_command,
diff --git a/gdb/cp-valprint.c b/gdb/cp-valprint.c
index 9f29eee13a01..288ebafec728 100644
--- a/gdb/cp-valprint.c
+++ b/gdb/cp-valprint.c
@@ -789,8 +789,9 @@ cp_print_class_member (const gdb_byte *valaddr, struct type *type,
 }
 
 
+void _initialize_cp_valprint ();
 void
-_initialize_cp_valprint (void)
+_initialize_cp_valprint ()
 {
   obstack_begin (&dont_print_stat_array_obstack,
 		 32 * sizeof (struct type *));
diff --git a/gdb/cris-linux-tdep.c b/gdb/cris-linux-tdep.c
index 4ae127b8ec03..9093cc300f4e 100644
--- a/gdb/cris-linux-tdep.c
+++ b/gdb/cris-linux-tdep.c
@@ -47,8 +47,9 @@ cris_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
 }
 
+void _initialize_cris_linux_tdep ();
 void
-_initialize_cris_linux_tdep (void)
+_initialize_cris_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_cris, 0, GDB_OSABI_LINUX,
 			  cris_linux_init_abi);
diff --git a/gdb/cris-tdep.c b/gdb/cris-tdep.c
index 0b2fb91f8cce..22b4db917ca0 100644
--- a/gdb/cris-tdep.c
+++ b/gdb/cris-tdep.c
@@ -3829,8 +3829,9 @@ static struct core_fns cris_elf_core_fns =
   NULL                                  /* next */
 };
 
+void _initialize_cris_tdep ();
 void
-_initialize_cris_tdep (void)
+_initialize_cris_tdep ()
 {
   gdbarch_register (bfd_arch_cris, cris_gdbarch_init, cris_dump_tdep);
   
diff --git a/gdb/csky-linux-tdep.c b/gdb/csky-linux-tdep.c
index b52207948876..fb4310204463 100644
--- a/gdb/csky-linux-tdep.c
+++ b/gdb/csky-linux-tdep.c
@@ -255,8 +255,9 @@ csky_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 				&csky_linux_rt_sigreturn_tramp_frame);
 }
 
+void _initialize_csky_linux_tdep ();
 void
-_initialize_csky_linux_tdep (void)
+_initialize_csky_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_csky, 0, GDB_OSABI_LINUX,
 			  csky_linux_init_abi);
diff --git a/gdb/csky-tdep.c b/gdb/csky-tdep.c
index f720a053fbc3..583298ce74c8 100644
--- a/gdb/csky-tdep.c
+++ b/gdb/csky-tdep.c
@@ -2240,8 +2240,9 @@ csky_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_csky_tdep ();
 void
-_initialize_csky_tdep (void)
+_initialize_csky_tdep ()
 {
 
   register_gdbarch_init (bfd_arch_csky, csky_gdbarch_init);
diff --git a/gdb/ctfread.c b/gdb/ctfread.c
index ebf1eec6a576..bfca2703c552 100644
--- a/gdb/ctfread.c
+++ b/gdb/ctfread.c
@@ -1475,7 +1475,8 @@ elfctf_build_psymtabs (struct objfile *of)
   scan_partial_symbols (fp, of);
 }
 
+void _initialize_ctfread ();
 void
-_initialize_ctfread (void)
+_initialize_ctfread ()
 {
 }
diff --git a/gdb/d-lang.c b/gdb/d-lang.c
index 7ed5ad4a9ee7..76d173b61eab 100644
--- a/gdb/d-lang.c
+++ b/gdb/d-lang.c
@@ -344,8 +344,9 @@ builtin_d_type (struct gdbarch *gdbarch)
   return (const struct builtin_d_type *) gdbarch_data (gdbarch, d_type_data);
 }
 
+void _initialize_d_language ();
 void
-_initialize_d_language (void)
+_initialize_d_language ()
 {
   d_type_data = gdbarch_data_register_post_init (build_d_types);
 }
diff --git a/gdb/darwin-nat-info.c b/gdb/darwin-nat-info.c
index d800309686d3..93d1554b9770 100644
--- a/gdb/darwin-nat-info.c
+++ b/gdb/darwin-nat-info.c
@@ -838,8 +838,9 @@ info_mach_exceptions_command (const char *args, int from_tty)
     }
 }
 
+void _initialize_darwin_info_commands ();
 void
-_initialize_darwin_info_commands (void)
+_initialize_darwin_info_commands ()
 {
   add_info ("mach-tasks", info_mach_tasks_command,
             _("Get list of tasks in system."));
diff --git a/gdb/darwin-nat.c b/gdb/darwin-nat.c
index 2a33a7d522f2..9baa1e91d539 100644
--- a/gdb/darwin-nat.c
+++ b/gdb/darwin-nat.c
@@ -2482,6 +2482,7 @@ darwin_nat_target::supports_multi_process ()
   return true;
 }
 
+void _initialize_darwin_nat ();
 void
 _initialize_darwin_nat ()
 {
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index 0909c67ccbb4..bec622a10f5f 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -3180,8 +3180,9 @@ static const struct sym_fns aout_sym_fns =
   &psym_functions
 };
 
+void _initialize_dbxread ();
 void
-_initialize_dbxread (void)
+_initialize_dbxread ()
 {
   add_symtab_fns (bfd_target_aout_flavour, &aout_sym_fns);
 }
diff --git a/gdb/dcache.c b/gdb/dcache.c
index 76d14a2443dd..f018882bf95d 100644
--- a/gdb/dcache.c
+++ b/gdb/dcache.c
@@ -684,8 +684,9 @@ show_dcache_command (const char *args, int from_tty)
   cmd_show_list (dcache_show_list, from_tty, "");
 }
 
+void _initialize_dcache ();
 void
-_initialize_dcache (void)
+_initialize_dcache ()
 {
   add_setshow_boolean_cmd ("remotecache", class_support,
 			   &dcache_enabled_p, _("\
diff --git a/gdb/disasm-selftests.c b/gdb/disasm-selftests.c
index ab6058c2a331..b63a35ab1e5a 100644
--- a/gdb/disasm-selftests.c
+++ b/gdb/disasm-selftests.c
@@ -210,8 +210,9 @@ memory_error_test (struct gdbarch *gdbarch)
 } // namespace selftests
 #endif /* GDB_SELF_TEST */
 
+void _initialize_disasm_selftests ();
 void
-_initialize_disasm_selftests (void)
+_initialize_disasm_selftests ()
 {
 #if GDB_SELF_TEST
   selftests::register_test_foreach_arch ("print_one_insn",
diff --git a/gdb/disasm.c b/gdb/disasm.c
index 39052f7fd36a..7dfbd2fb4721 100644
--- a/gdb/disasm.c
+++ b/gdb/disasm.c
@@ -1128,8 +1128,9 @@ disassembler_options_completer (struct cmd_list_element *ignore,
 
 /* Initialization code.  */
 
+void _initialize_disasm ();
 void
-_initialize_disasm (void)
+_initialize_disasm ()
 {
   struct cmd_list_element *cmd;
 
diff --git a/gdb/dtrace-probe.c b/gdb/dtrace-probe.c
index 85f6c01b6ab0..71d627bcbd07 100644
--- a/gdb/dtrace-probe.c
+++ b/gdb/dtrace-probe.c
@@ -897,8 +897,9 @@ info_probes_dtrace_command (const char *arg, int from_tty)
   info_probes_for_spops (arg, from_tty, &dtrace_static_probe_ops);
 }
 
+void _initialize_dtrace_probe ();
 void
-_initialize_dtrace_probe (void)
+_initialize_dtrace_probe ()
 {
   all_static_probe_ops.push_back (&dtrace_static_probe_ops);
 
diff --git a/gdb/dummy-frame.c b/gdb/dummy-frame.c
index 2fe578ee6bfd..d47cfd2d9a2d 100644
--- a/gdb/dummy-frame.c
+++ b/gdb/dummy-frame.c
@@ -431,8 +431,9 @@ maintenance_print_dummy_frames (const char *args, int from_tty)
     }
 }
 
+void _initialize_dummy_frame ();
 void
-_initialize_dummy_frame (void)
+_initialize_dummy_frame ()
 {
   add_cmd ("dummy-frames", class_maintenance, maintenance_print_dummy_frames,
 	   _("Print the contents of the internal dummy-frame stack."),
diff --git a/gdb/dwarf-index-cache.c b/gdb/dwarf-index-cache.c
index a2f0c42aad4b..977fcc1b20c2 100644
--- a/gdb/dwarf-index-cache.c
+++ b/gdb/dwarf-index-cache.c
@@ -325,6 +325,7 @@ show_index_cache_stats_command (const char *arg, int from_tty)
 		     indent, global_index_cache.n_misses ());
 }
 
+void _initialize_index_cache ();
 void
 _initialize_index_cache ()
 {
diff --git a/gdb/dwarf-index-write.c b/gdb/dwarf-index-write.c
index f2abe70e1554..fd222628cf56 100644
--- a/gdb/dwarf-index-write.c
+++ b/gdb/dwarf-index-write.c
@@ -1781,6 +1781,7 @@ save_gdb_index_command (const char *arg, int from_tty)
     }
 }
 
+void _initialize_dwarf_index_write ();
 void
 _initialize_dwarf_index_write ()
 {
diff --git a/gdb/dwarf2-frame-tailcall.c b/gdb/dwarf2-frame-tailcall.c
index 9c167c1d96fb..fca1d3d0235b 100644
--- a/gdb/dwarf2-frame-tailcall.c
+++ b/gdb/dwarf2-frame-tailcall.c
@@ -467,8 +467,9 @@ const struct frame_unwind dwarf2_tailcall_frame_unwind =
   tailcall_frame_prev_arch
 };
 
+void _initialize_tailcall_frame ();
 void
-_initialize_tailcall_frame (void)
+_initialize_tailcall_frame ()
 {
   cache_htab = htab_create_alloc (50, cache_hash, cache_eq, NULL, xcalloc,
 				  xfree);
diff --git a/gdb/dwarf2-frame.c b/gdb/dwarf2-frame.c
index baa47c943898..a043d48217bf 100644
--- a/gdb/dwarf2-frame.c
+++ b/gdb/dwarf2-frame.c
@@ -2354,8 +2354,9 @@ show_dwarf_unwinders_enabled_p (struct ui_file *file, int from_tty,
 		    value);
 }
 
+void _initialize_dwarf2_frame ();
 void
-_initialize_dwarf2_frame (void)
+_initialize_dwarf2_frame ()
 {
   dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init);
 
diff --git a/gdb/dwarf2expr.c b/gdb/dwarf2expr.c
index 3c81cba3dfc1..ad82cbec2f70 100644
--- a/gdb/dwarf2expr.c
+++ b/gdb/dwarf2expr.c
@@ -1419,8 +1419,9 @@ dwarf_expr_context::execute_stack_op (const gdb_byte *op_ptr,
   gdb_assert (this->recursion_depth >= 0);
 }
 
+void _initialize_dwarf2expr ();
 void
-_initialize_dwarf2expr (void)
+_initialize_dwarf2expr ()
 {
   dwarf_arch_cookie
     = gdbarch_data_register_post_init (dwarf_gdbarch_types_init);
diff --git a/gdb/dwarf2loc.c b/gdb/dwarf2loc.c
index 99cac03a5474..1fe6829100db 100644
--- a/gdb/dwarf2loc.c
+++ b/gdb/dwarf2loc.c
@@ -4514,8 +4514,9 @@ const struct symbol_computed_ops dwarf2_loclist_funcs = {
   loclist_generate_c_location
 };
 
+void _initialize_dwarf2loc ();
 void
-_initialize_dwarf2loc (void)
+_initialize_dwarf2loc ()
 {
   add_setshow_zuinteger_cmd ("entry-values", class_maintenance,
 			     &entry_values_debug,
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 04979f3d12fa..216601a61ab5 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -26133,8 +26133,9 @@ show_check_physname (struct ui_file *file, int from_tty,
 		    value);
 }
 
+void _initialize_dwarf2_read ();
 void
-_initialize_dwarf2_read (void)
+_initialize_dwarf2_read ()
 {
   add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
 Set DWARF specific variables.\n\
diff --git a/gdb/elfread.c b/gdb/elfread.c
index 618e4cd566ca..9a6ce0ee3716 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -1469,8 +1469,9 @@ static const struct gnu_ifunc_fns elf_gnu_ifunc_fns =
   elf_gnu_ifunc_resolver_return_stop
 };
 
+void _initialize_elfread ();
 void
-_initialize_elfread (void)
+_initialize_elfread ()
 {
   add_symtab_fns (bfd_target_elf_flavour, &elf_sym_fns);
 
diff --git a/gdb/exec.c b/gdb/exec.c
index 468f9f57f76c..eb07b51dda74 100644
--- a/gdb/exec.c
+++ b/gdb/exec.c
@@ -1063,8 +1063,9 @@ exec_target::find_memory_regions (find_memory_region_ftype func, void *data)
   return objfile_find_memory_regions (this, func, data);
 }
 
+void _initialize_exec ();
 void
-_initialize_exec (void)
+_initialize_exec ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/extension.c b/gdb/extension.c
index f9418de43115..947e440c12c8 100644
--- a/gdb/extension.c
+++ b/gdb/extension.c
@@ -934,8 +934,9 @@ ext_lang_before_prompt (const char *current_gdb_prompt)
     }
 }
 
+void _initialize_extension ();
 void
-_initialize_extension (void)
+_initialize_extension ()
 {
   gdb::observers::before_prompt.attach (ext_lang_before_prompt);
 }
diff --git a/gdb/f-lang.c b/gdb/f-lang.c
index c7c47cf8dcfe..e767f52fc210 100644
--- a/gdb/f-lang.c
+++ b/gdb/f-lang.c
@@ -761,8 +761,9 @@ builtin_f_type (struct gdbarch *gdbarch)
   return (const struct builtin_f_type *) gdbarch_data (gdbarch, f_type_data);
 }
 
+void _initialize_f_language ();
 void
-_initialize_f_language (void)
+_initialize_f_language ()
 {
   f_type_data = gdbarch_data_register_post_init (build_fortran_types);
 }
diff --git a/gdb/f-valprint.c b/gdb/f-valprint.c
index 60611fef4948..168957f6fb85 100644
--- a/gdb/f-valprint.c
+++ b/gdb/f-valprint.c
@@ -479,8 +479,9 @@ info_common_command (const char *comname, int from_tty)
     }
 }
 
+void _initialize_f_valprint ();
 void
-_initialize_f_valprint (void)
+_initialize_f_valprint ()
 {
   add_info ("common", info_common_command,
 	    _("Print out the values contained in a Fortran COMMON block."));
diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c
index 698d1f0b35e1..0e4afb29a009 100644
--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -1669,8 +1669,9 @@ fbsd_nat_target::set_syscall_catchpoint (int pid, bool needed,
 #endif
 #endif
 
+void _initialize_fbsd_nat ();
 void
-_initialize_fbsd_nat (void)
+_initialize_fbsd_nat ()
 {
 #ifdef PT_LWPINFO
   add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance,
diff --git a/gdb/fbsd-tdep.c b/gdb/fbsd-tdep.c
index 9e5d23a4bc8d..bc1b5afd020c 100644
--- a/gdb/fbsd-tdep.c
+++ b/gdb/fbsd-tdep.c
@@ -2085,8 +2085,9 @@ fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_get_syscall_number (gdbarch, fbsd_get_syscall_number);
 }
 
+void _initialize_fbsd_tdep ();
 void
-_initialize_fbsd_tdep (void)
+_initialize_fbsd_tdep ()
 {
   fbsd_gdbarch_data_handle =
     gdbarch_data_register_post_init (init_fbsd_gdbarch_data);
diff --git a/gdb/filesystem.c b/gdb/filesystem.c
index 359b42f1bd15..94a1a9cac056 100644
--- a/gdb/filesystem.c
+++ b/gdb/filesystem.c
@@ -76,8 +76,9 @@ is \"%s\".\n"),
 		      value);
 }
 
+void _initialize_filesystem ();
 void
-_initialize_filesystem (void)
+_initialize_filesystem ()
 {
   add_setshow_enum_cmd ("target-file-system-kind",
 			class_files,
diff --git a/gdb/findcmd.c b/gdb/findcmd.c
index 1f3b3dfc2a33..c8631571f209 100644
--- a/gdb/findcmd.c
+++ b/gdb/findcmd.c
@@ -280,8 +280,9 @@ find_command (const char *args, int from_tty)
 		     found_count > 1 ? "s" : "");
 }
 
+void _initialize_mem_search ();
 void
-_initialize_mem_search (void)
+_initialize_mem_search ()
 {
   add_cmd ("find", class_vars, find_command, _("\
 Search memory for a sequence of bytes.\n\
diff --git a/gdb/findvar.c b/gdb/findvar.c
index 987c8e301a75..5cf1cd4137b8 100644
--- a/gdb/findvar.c
+++ b/gdb/findvar.c
@@ -1088,8 +1088,9 @@ copy_integer_to_size_test ()
 
 #endif
 
+void _initialize_findvar ();
 void
-_initialize_findvar (void)
+_initialize_findvar ()
 {
 #if GDB_SELF_TEST
   selftests::register_test
diff --git a/gdb/fork-child.c b/gdb/fork-child.c
index 65a189e04878..010414cc781b 100644
--- a/gdb/fork-child.c
+++ b/gdb/fork-child.c
@@ -157,8 +157,9 @@ show_startup_with_shell (struct ui_file *file, int from_tty,
 		    value);
 }
 
+void _initialize_fork_child ();
 void
-_initialize_fork_child (void)
+_initialize_fork_child ()
 {
   add_setshow_filename_cmd ("exec-wrapper", class_run, &exec_wrapper, _("\
 Set a wrapper for running programs.\n\
diff --git a/gdb/frame-base.c b/gdb/frame-base.c
index b36c5e3bac4f..9d8dd52daa7a 100644
--- a/gdb/frame-base.c
+++ b/gdb/frame-base.c
@@ -121,8 +121,9 @@ frame_base_find_by_frame (struct frame_info *this_frame)
   return table->default_base;
 }
 
+void _initialize_frame_base ();
 void
-_initialize_frame_base (void)
+_initialize_frame_base ()
 {
   frame_base_data = gdbarch_data_register_pre_init (frame_base_init);
 }
diff --git a/gdb/frame-unwind.c b/gdb/frame-unwind.c
index 079a411c2055..35f2e82c57dd 100644
--- a/gdb/frame-unwind.c
+++ b/gdb/frame-unwind.c
@@ -305,8 +305,9 @@ frame_unwind_got_address (struct frame_info *frame, int regnum,
   return reg_val;
 }
 
+void _initialize_frame_unwind ();
 void
-_initialize_frame_unwind (void)
+_initialize_frame_unwind ()
 {
   frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init);
 }
diff --git a/gdb/frame.c b/gdb/frame.c
index c746a6a231ed..9ec93eb4c740 100644
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -2958,8 +2958,9 @@ the rest of the stack trace."),
   },
 };
 
+void _initialize_frame ();
 void
-_initialize_frame (void)
+_initialize_frame ()
 {
   obstack_init (&frame_cache_obstack);
 
diff --git a/gdb/frv-linux-tdep.c b/gdb/frv-linux-tdep.c
index 54ea43478b23..5014c3ebbf3d 100644
--- a/gdb/frv-linux-tdep.c
+++ b/gdb/frv-linux-tdep.c
@@ -481,8 +481,9 @@ frv_linux_elf_osabi_sniffer (bfd *abfd)
     return GDB_OSABI_UNKNOWN;
 }
 
+void _initialize_frv_linux_tdep ();
 void
-_initialize_frv_linux_tdep (void)
+_initialize_frv_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_frv, 0, GDB_OSABI_LINUX,
 			  frv_linux_init_abi);
diff --git a/gdb/frv-tdep.c b/gdb/frv-tdep.c
index ca5ffe3c1a13..ae383e7aaf8f 100644
--- a/gdb/frv-tdep.c
+++ b/gdb/frv-tdep.c
@@ -1573,8 +1573,9 @@ frv_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_frv_tdep ();
 void
-_initialize_frv_tdep (void)
+_initialize_frv_tdep ()
 {
   register_gdbarch_init (bfd_arch_frv, frv_gdbarch_init);
 }
diff --git a/gdb/ft32-tdep.c b/gdb/ft32-tdep.c
index 2d18b0ac3f1b..99ef69de770f 100644
--- a/gdb/ft32-tdep.c
+++ b/gdb/ft32-tdep.c
@@ -616,8 +616,9 @@ ft32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
 /* Register this machine's init routine.  */
 
+void _initialize_ft32_tdep ();
 void
-_initialize_ft32_tdep (void)
+_initialize_ft32_tdep ()
 {
   register_gdbarch_init (bfd_arch_ft32, ft32_gdbarch_init);
 }
diff --git a/gdb/gcore.c b/gdb/gcore.c
index d3f1b47644aa..d12011e9021d 100644
--- a/gdb/gcore.c
+++ b/gdb/gcore.c
@@ -590,8 +590,9 @@ gcore_memory_sections (bfd *obfd)
   return 1;
 }
 
+void _initialize_gcore ();
 void
-_initialize_gcore (void)
+_initialize_gcore ()
 {
   add_com ("generate-core-file", class_files, gcore_command, _("\
 Save a core file with the current state of the debugged process.\n\
diff --git a/gdb/gdb-demangle.c b/gdb/gdb-demangle.c
index debe395e9315..6a664e99bfc4 100644
--- a/gdb/gdb-demangle.c
+++ b/gdb/gdb-demangle.c
@@ -212,8 +212,9 @@ demangle_command (const char *args, int from_tty)
     error (_("Can't demangle \"%s\""), name);
 }
 
+void _initialize_gdb_demangle ();
 void
-_initialize_gdb_demangle (void)
+_initialize_gdb_demangle ()
 {
   int i, ndems;
 
diff --git a/gdb/gdb_bfd.c b/gdb/gdb_bfd.c
index c82191ee97b1..5a6dee2d51a8 100644
--- a/gdb/gdb_bfd.c
+++ b/gdb/gdb_bfd.c
@@ -962,8 +962,9 @@ maintenance_info_bfds (const char *arg, int from_tty)
   htab_traverse (all_bfds, print_one_bfd, uiout);
 }
 
+void _initialize_gdb_bfd ();
 void
-_initialize_gdb_bfd (void)
+_initialize_gdb_bfd ()
 {
   all_bfds = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
 				NULL, xcalloc, xfree);
diff --git a/gdb/gdbarch-selftests.c b/gdb/gdbarch-selftests.c
index 47f4d99d18c9..c99a900dbfb2 100644
--- a/gdb/gdbarch-selftests.c
+++ b/gdb/gdbarch-selftests.c
@@ -160,8 +160,9 @@ register_to_value_test (struct gdbarch *gdbarch)
 } // namespace selftests
 #endif /* GDB_SELF_TEST */
 
+void _initialize_gdbarch_selftests ();
 void
-_initialize_gdbarch_selftests (void)
+_initialize_gdbarch_selftests ()
 {
 #if GDB_SELF_TEST
   selftests::register_test_foreach_arch ("register_to_value",
diff --git a/gdb/gdbarch.c b/gdb/gdbarch.c
index ab9bf1f5f485..cc8569f5c959 100644
--- a/gdb/gdbarch.c
+++ b/gdb/gdbarch.c
@@ -5548,8 +5548,9 @@ target_gdbarch (void)
   return current_inferior ()->gdbarch;
 }
 
+void _initialize_gdbarch ();
 void
-_initialize_gdbarch (void)
+_initialize_gdbarch ()
 {
   add_setshow_zuinteger_cmd ("arch", class_maintenance, &gdbarch_debug, _("\
 Set architecture debugging."), _("\
diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index 827c622dbf4b..1d5bfd4bc205 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -5694,8 +5694,9 @@ objfile_type (struct objfile *objfile)
   return objfile_type;
 }
 
+void _initialize_gdbtypes ();
 void
-_initialize_gdbtypes (void)
+_initialize_gdbtypes ()
 {
   gdbtypes_data = gdbarch_data_register_post_init (gdbtypes_post_init);
 
diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
index 74a96f1154f5..3b438a9a4346 100644
--- a/gdb/gnu-nat.c
+++ b/gdb/gnu-nat.c
@@ -3500,8 +3500,9 @@ to the thread's initial suspend-count when gdb notices the threads."),
 	   &thread_cmd_list);
 }
 
+void _initialize_gnu_nat ();
 void
-_initialize_gnu_nat (void)
+_initialize_gnu_nat ()
 {
   proc_server = getproc ();
 
diff --git a/gdb/gnu-v2-abi.c b/gdb/gnu-v2-abi.c
index 987f1c33743c..a9b2e0aa8c00 100644
--- a/gdb/gnu-v2-abi.c
+++ b/gdb/gnu-v2-abi.c
@@ -413,8 +413,9 @@ init_gnuv2_ops (void)
   gnu_v2_abi_ops.baseclass_offset = gnuv2_baseclass_offset;
 }
 
+void _initialize_gnu_v2_abi ();
 void
-_initialize_gnu_v2_abi (void)
+_initialize_gnu_v2_abi ()
 {
   init_gnuv2_ops ();
   register_cp_abi (&gnu_v2_abi_ops);
diff --git a/gdb/gnu-v3-abi.c b/gdb/gnu-v3-abi.c
index 88543396526b..89574ec9ed51 100644
--- a/gdb/gnu-v3-abi.c
+++ b/gdb/gnu-v3-abi.c
@@ -1568,8 +1568,9 @@ init_gnuv3_ops (void)
   gnu_v3_abi_ops.pass_by_reference = gnuv3_pass_by_reference;
 }
 
+void _initialize_gnu_v3_abi ();
 void
-_initialize_gnu_v3_abi (void)
+_initialize_gnu_v3_abi ()
 {
   init_gnuv3_ops ();
 
diff --git a/gdb/go-lang.c b/gdb/go-lang.c
index fe60b2904111..9ad456f72e8e 100644
--- a/gdb/go-lang.c
+++ b/gdb/go-lang.c
@@ -682,8 +682,9 @@ builtin_go_type (struct gdbarch *gdbarch)
   return (const struct builtin_go_type *) gdbarch_data (gdbarch, go_type_data);
 }
 
+void _initialize_go_language ();
 void
-_initialize_go_language (void)
+_initialize_go_language ()
 {
   go_type_data = gdbarch_data_register_post_init (build_go_types);
 }
diff --git a/gdb/go32-nat.c b/gdb/go32-nat.c
index bcb400a3e1d7..b3ebd6cf2295 100644
--- a/gdb/go32-nat.c
+++ b/gdb/go32-nat.c
@@ -2081,8 +2081,9 @@ go32_info_dos_command (const char *args, int from_tty)
   help_list (info_dos_cmdlist, "info dos ", class_info, gdb_stdout);
 }
 
+void _initialize_go32_nat ();
 void
-_initialize_go32_nat (void)
+_initialize_go32_nat ()
 {
   x86_dr_low.set_control = go32_set_dr7;
   x86_dr_low.set_addr = go32_set_dr;
diff --git a/gdb/guile/guile.c b/gdb/guile/guile.c
index 506836157ee3..4b0103c93464 100644
--- a/gdb/guile/guile.c
+++ b/gdb/guile/guile.c
@@ -792,8 +792,9 @@ message == an error message without a stack will be printed."),
 			&set_guile_list, &show_guile_list);
 }
 
+void _initialize_guile ();
 void
-_initialize_guile (void)
+_initialize_guile ()
 {
   install_gdb_commands ();
 
diff --git a/gdb/h8300-tdep.c b/gdb/h8300-tdep.c
index f4996ee35a77..5e8ba94b72f8 100644
--- a/gdb/h8300-tdep.c
+++ b/gdb/h8300-tdep.c
@@ -1377,8 +1377,9 @@ h8300_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
 }
 
+void _initialize_h8300_tdep ();
 void
-_initialize_h8300_tdep (void)
+_initialize_h8300_tdep ()
 {
   register_gdbarch_init (bfd_arch_h8300, h8300_gdbarch_init);
 }
diff --git a/gdb/hppa-linux-nat.c b/gdb/hppa-linux-nat.c
index 5a019d5a5569..f352c25a3e63 100644
--- a/gdb/hppa-linux-nat.c
+++ b/gdb/hppa-linux-nat.c
@@ -384,8 +384,9 @@ fill_fpregset (const struct regcache *regcache,
    }
 }
 
+void _initialize_hppa_linux_nat ();
 void
-_initialize_hppa_linux_nat (void)
+_initialize_hppa_linux_nat ()
 {
   /* Register the target.  */
   linux_target = &the_hppa_linux_nat_target;
diff --git a/gdb/hppa-linux-tdep.c b/gdb/hppa-linux-tdep.c
index 159f572d4898..51c84d8e4f0d 100644
--- a/gdb/hppa-linux-tdep.c
+++ b/gdb/hppa-linux-tdep.c
@@ -526,8 +526,9 @@ hppa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
                                              svr4_fetch_objfile_link_map);
 }
 
+void _initialize_hppa_linux_tdep ();
 void
-_initialize_hppa_linux_tdep (void)
+_initialize_hppa_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_LINUX,
 			  hppa_linux_init_abi);
diff --git a/gdb/hppa-nbsd-nat.c b/gdb/hppa-nbsd-nat.c
index 5b8e8f03277b..d8255030ddf0 100644
--- a/gdb/hppa-nbsd-nat.c
+++ b/gdb/hppa-nbsd-nat.c
@@ -228,8 +228,9 @@ hppa_nbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
     }
 }
 
+void _initialize_hppanbsd_nat ();
 void
-_initialize_hppanbsd_nat (void)
+_initialize_hppanbsd_nat ()
 {
   add_inf_child_target (&the_hppa_nbsd_nat_target);
 }
diff --git a/gdb/hppa-nbsd-tdep.c b/gdb/hppa-nbsd-tdep.c
index 383010bef661..b532ab1d5cc5 100644
--- a/gdb/hppa-nbsd-tdep.c
+++ b/gdb/hppa-nbsd-tdep.c
@@ -208,8 +208,9 @@ hppanbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tramp_frame_prepend_unwinder (gdbarch, &hppanbsd_sigtramp_si4);
 }
 
+void _initialize_hppanbsd_tdep ();
 void
-_initialize_hppanbsd_tdep (void)
+_initialize_hppanbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_NETBSD,
 			  hppanbsd_init_abi);
diff --git a/gdb/hppa-obsd-nat.c b/gdb/hppa-obsd-nat.c
index 8c79c0043d18..939a532b7853 100644
--- a/gdb/hppa-obsd-nat.c
+++ b/gdb/hppa-obsd-nat.c
@@ -252,8 +252,9 @@ hppa_obsd_nat_target::store_registers (struct regcache *regcache, int regnum)
     }
 }
 
+void _initialize_hppaobsd_nat ();
 void
-_initialize_hppaobsd_nat (void)
+_initialize_hppaobsd_nat ()
 {
   add_inf_child_target (&the_hppa_obsd_nat_target);
 }
diff --git a/gdb/hppa-obsd-tdep.c b/gdb/hppa-obsd-tdep.c
index aa013ba3d814..d7f72491c703 100644
--- a/gdb/hppa-obsd-tdep.c
+++ b/gdb/hppa-obsd-tdep.c
@@ -168,8 +168,9 @@ hppaobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, hppaobsd_iterate_over_regset_sections);
 }
 
+void _initialize_hppabsd_tdep ();
 void
-_initialize_hppabsd_tdep (void)
+_initialize_hppabsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_OPENBSD,
 			  hppaobsd_init_abi);
diff --git a/gdb/hppa-tdep.c b/gdb/hppa-tdep.c
index 1ee1b0ba286e..d8a3a5605733 100644
--- a/gdb/hppa-tdep.c
+++ b/gdb/hppa-tdep.c
@@ -3168,8 +3168,9 @@ hppa_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
   fprintf_unfiltered (file, "elf = %s\n", tdep->is_elf ? "yes" : "no");
 }
 
+void _initialize_hppa_tdep ();
 void
-_initialize_hppa_tdep (void)
+_initialize_hppa_tdep ()
 {
   gdbarch_register (bfd_arch_hppa, hppa_gdbarch_init, hppa_dump_tdep);
 
diff --git a/gdb/i386-bsd-nat.c b/gdb/i386-bsd-nat.c
index 41b4a9c89511..4e22013a7a8d 100644
--- a/gdb/i386-bsd-nat.c
+++ b/gdb/i386-bsd-nat.c
@@ -319,8 +319,9 @@ i386bsd_store_inferior_registers (struct regcache *regcache, int regnum)
     }
 }
 
+void _initialize_i386bsd_nat ();
 void
-_initialize_i386bsd_nat (void)
+_initialize_i386bsd_nat ()
 {
   int offset;
 
diff --git a/gdb/i386-cygwin-tdep.c b/gdb/i386-cygwin-tdep.c
index ee04752b546c..f703579efda9 100644
--- a/gdb/i386-cygwin-tdep.c
+++ b/gdb/i386-cygwin-tdep.c
@@ -247,8 +247,9 @@ i386_cygwin_osabi_sniffer (bfd *abfd)
   return GDB_OSABI_UNKNOWN;
 }
 
+void _initialize_i386_cygwin_tdep ();
 void
-_initialize_i386_cygwin_tdep (void)
+_initialize_i386_cygwin_tdep ()
 {
   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour,
                                   i386_cygwin_osabi_sniffer);
diff --git a/gdb/i386-darwin-nat.c b/gdb/i386-darwin-nat.c
index 8b0b6fbb6a85..55a1f7ce9a24 100644
--- a/gdb/i386-darwin-nat.c
+++ b/gdb/i386-darwin-nat.c
@@ -633,8 +633,9 @@ darwin_set_sstep (thread_t thread, int enable)
     }
 }
 
+void _initialize_i386_darwin_nat ();
 void
-_initialize_i386_darwin_nat (void)
+_initialize_i386_darwin_nat ()
 {
 #ifdef BFD64
   amd64_native_gregset64_reg_offset = amd64_darwin_thread_state_reg_offset;
diff --git a/gdb/i386-darwin-tdep.c b/gdb/i386-darwin-tdep.c
index deeb61353c11..a1c226ba66fa 100644
--- a/gdb/i386-darwin-tdep.c
+++ b/gdb/i386-darwin-tdep.c
@@ -286,8 +286,9 @@ i386_mach_o_osabi_sniffer (bfd *abfd)
   return GDB_OSABI_UNKNOWN;
 }
 
+void _initialize_i386_darwin_tdep ();
 void
-_initialize_i386_darwin_tdep (void)
+_initialize_i386_darwin_tdep ()
 {
   gdbarch_register_osabi_sniffer (bfd_arch_unknown, bfd_target_mach_o_flavour,
                                   i386_mach_o_osabi_sniffer);
diff --git a/gdb/i386-dicos-tdep.c b/gdb/i386-dicos-tdep.c
index ba4803e20452..11c61f862bf0 100644
--- a/gdb/i386-dicos-tdep.c
+++ b/gdb/i386-dicos-tdep.c
@@ -41,8 +41,9 @@ i386_dicos_osabi_sniffer (bfd *abfd)
   return GDB_OSABI_UNKNOWN;
 }
 
+void _initialize_i386_dicos_tdep ();
 void
-_initialize_i386_dicos_tdep (void)
+_initialize_i386_dicos_tdep ()
 {
   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
                                   i386_dicos_osabi_sniffer);
diff --git a/gdb/i386-fbsd-nat.c b/gdb/i386-fbsd-nat.c
index 1a581695e67a..480c017da411 100644
--- a/gdb/i386-fbsd-nat.c
+++ b/gdb/i386-fbsd-nat.c
@@ -174,8 +174,9 @@ i386_fbsd_nat_target::supports_stopped_by_hw_breakpoint ()
 }
 #endif
 
+void _initialize_i386fbsd_nat ();
 void
-_initialize_i386fbsd_nat (void)
+_initialize_i386fbsd_nat ()
 {
   add_inf_child_target (&the_i386_fbsd_nat_target);
 
diff --git a/gdb/i386-fbsd-tdep.c b/gdb/i386-fbsd-tdep.c
index d07270992906..0e53453bb6e3 100644
--- a/gdb/i386-fbsd-tdep.c
+++ b/gdb/i386-fbsd-tdep.c
@@ -451,8 +451,9 @@ i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 					i386fbsd_get_thread_local_address);
 }
 
+void _initialize_i386fbsd_tdep ();
 void
-_initialize_i386fbsd_tdep (void)
+_initialize_i386fbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD,
 			  i386fbsd4_init_abi);
diff --git a/gdb/i386-gnu-nat.c b/gdb/i386-gnu-nat.c
index 1add0c65a078..afbe8eff4935 100644
--- a/gdb/i386-gnu-nat.c
+++ b/gdb/i386-gnu-nat.c
@@ -425,8 +425,9 @@ i386_gnu_dr_get_control (void)
 }
 #endif /* i386_DEBUG_STATE */
 
+void _initialize_i386gnu_nat ();
 void
-_initialize_i386gnu_nat (void)
+_initialize_i386gnu_nat ()
 {
 #ifdef i386_DEBUG_STATE
   x86_dr_low.set_control = i386_gnu_dr_set_control;
diff --git a/gdb/i386-gnu-tdep.c b/gdb/i386-gnu-tdep.c
index 4f32c094a511..57183be759b6 100644
--- a/gdb/i386-gnu-tdep.c
+++ b/gdb/i386-gnu-tdep.c
@@ -61,8 +61,9 @@ i386gnu_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->jb_pc_offset = 20;	/* From <bits/setjmp.h>.  */
 }
 
+void _initialize_i386gnu_tdep ();
 void
-_initialize_i386gnu_tdep (void)
+_initialize_i386gnu_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_HURD, i386gnu_init_abi);
 }
diff --git a/gdb/i386-go32-tdep.c b/gdb/i386-go32-tdep.c
index e4d15cdc62a2..51d79c8da663 100644
--- a/gdb/i386-go32-tdep.c
+++ b/gdb/i386-go32-tdep.c
@@ -62,6 +62,7 @@ i386_coff_osabi_sniffer (bfd *abfd)
 }
 
 
+void _initialize_i386_go32_tdep ();
 void
 _initialize_i386_go32_tdep ()
 {
diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c
index 32cd879de80b..b4224b27c3a2 100644
--- a/gdb/i386-linux-nat.c
+++ b/gdb/i386-linux-nat.c
@@ -711,8 +711,9 @@ i386_linux_nat_target::low_resume (ptid_t ptid, int step, enum gdb_signal signal
     perror_with_name (("ptrace"));
 }
 
+void _initialize_i386_linux_nat ();
 void
-_initialize_i386_linux_nat (void)
+_initialize_i386_linux_nat ()
 {
   linux_target = &the_i386_linux_nat_target;
 
diff --git a/gdb/i386-linux-tdep.c b/gdb/i386-linux-tdep.c
index 5827cb4eec37..6f702b59e7f8 100644
--- a/gdb/i386-linux-tdep.c
+++ b/gdb/i386-linux-tdep.c
@@ -1076,8 +1076,9 @@ i386_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 					 i386_linux_handle_segmentation_fault);
 }
 
+void _initialize_i386_linux_tdep ();
 void
-_initialize_i386_linux_tdep (void)
+_initialize_i386_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_LINUX,
 			  i386_linux_init_abi);
diff --git a/gdb/i386-nbsd-nat.c b/gdb/i386-nbsd-nat.c
index e70a516a37ca..ac775c1ff846 100644
--- a/gdb/i386-nbsd-nat.c
+++ b/gdb/i386-nbsd-nat.c
@@ -73,8 +73,9 @@ i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 
 static i386_bsd_nat_target<nbsd_nat_target> the_i386_nbsd_nat_target;
 
+void _initialize_i386nbsd_nat ();
 void
-_initialize_i386nbsd_nat (void)
+_initialize_i386nbsd_nat ()
 {
   add_inf_child_target (&the_i386_nbsd_nat_target);
 
diff --git a/gdb/i386-nbsd-tdep.c b/gdb/i386-nbsd-tdep.c
index d0743c3ed7fe..3157451e08f5 100644
--- a/gdb/i386-nbsd-tdep.c
+++ b/gdb/i386-nbsd-tdep.c
@@ -421,8 +421,9 @@ i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->struct_return = pcc_struct_return;
 }
 
+void _initialize_i386nbsd_tdep ();
 void
-_initialize_i386nbsd_tdep (void)
+_initialize_i386nbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD,
 			  i386nbsdelf_init_abi);
diff --git a/gdb/i386-nto-tdep.c b/gdb/i386-nto-tdep.c
index 493d5c4f6ab4..cd6837b766ce 100644
--- a/gdb/i386-nto-tdep.c
+++ b/gdb/i386-nto-tdep.c
@@ -367,8 +367,9 @@ i386nto_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_wchar_signed (gdbarch, 0);
 }
 
+void _initialize_i386nto_tdep ();
 void
-_initialize_i386nto_tdep (void)
+_initialize_i386nto_tdep ()
 {
   init_i386nto_ops ();
   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO,
diff --git a/gdb/i386-obsd-nat.c b/gdb/i386-obsd-nat.c
index ebaa83463d46..205c08b1bbe4 100644
--- a/gdb/i386-obsd-nat.c
+++ b/gdb/i386-obsd-nat.c
@@ -90,8 +90,9 @@ i386obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 
 static i386_bsd_nat_target<obsd_nat_target> the_i386_obsd_nat_target;
 
+void _initialize_i386obsd_nat ();
 void
-_initialize_i386obsd_nat (void)
+_initialize_i386obsd_nat ()
 {
   add_inf_child_target (&i386_obsd_nat_target);
 
diff --git a/gdb/i386-obsd-tdep.c b/gdb/i386-obsd-tdep.c
index cb419fc93a28..309f5e68b766 100644
--- a/gdb/i386-obsd-tdep.c
+++ b/gdb/i386-obsd-tdep.c
@@ -443,8 +443,9 @@ i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 }
 
+void _initialize_i386obsd_tdep ();
 void
-_initialize_i386obsd_tdep (void)
+_initialize_i386obsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD,
 			  i386obsd_init_abi);
diff --git a/gdb/i386-sol2-nat.c b/gdb/i386-sol2-nat.c
index 2092c7e6a746..f54b3b109e8d 100644
--- a/gdb/i386-sol2-nat.c
+++ b/gdb/i386-sol2-nat.c
@@ -241,8 +241,9 @@ fill_fpregset (const struct regcache *regcache,
 
 #endif
 
+void _initialize_amd64_sol2_nat ();
 void
-_initialize_amd64_sol2_nat (void)
+_initialize_amd64_sol2_nat ()
 {
 #if PR_MODEL_NATIVE == PR_MODEL_LP64
   amd64_native_gregset32_reg_offset = amd64_sol2_gregset32_reg_offset;
diff --git a/gdb/i386-sol2-tdep.c b/gdb/i386-sol2-tdep.c
index ff797848bdd2..1980485cd4db 100644
--- a/gdb/i386-sol2-tdep.c
+++ b/gdb/i386-sol2-tdep.c
@@ -151,8 +151,9 @@ i386_sol2_osabi_sniffer (bfd *abfd)
   return GDB_OSABI_UNKNOWN;
 }
 
+void _initialize_i386_sol2_tdep ();
 void
-_initialize_i386_sol2_tdep (void)
+_initialize_i386_sol2_tdep ()
 {
   /* Register an ELF OS ABI sniffer for Solaris 2 binaries.  */
   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index a19fc62e8d4a..f120438081de 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -9032,8 +9032,9 @@ show_mpx_cmd (const char *args, int from_tty)
   cmd_show_list (mpx_show_cmdlist, from_tty, "");
 }
 
+void _initialize_i386_tdep ();
 void
-_initialize_i386_tdep (void)
+_initialize_i386_tdep ()
 {
   register_gdbarch_init (bfd_arch_i386, i386_gdbarch_init);
 
diff --git a/gdb/i386-windows-nat.c b/gdb/i386-windows-nat.c
index bcabacc5a06e..958c83eafe66 100644
--- a/gdb/i386-windows-nat.c
+++ b/gdb/i386-windows-nat.c
@@ -79,8 +79,9 @@ i386_windows_segment_register_p (int regnum)
   return regnum >= I386_CS_REGNUM && regnum <= I386_GS_REGNUM;
 }
 
+void _initialize_i386_windows_nat ();
 void
-_initialize_i386_windows_nat (void)
+_initialize_i386_windows_nat ()
 {
   windows_set_context_register_offsets (mappings);
   windows_set_segment_register_p (i386_windows_segment_register_p);
diff --git a/gdb/ia64-libunwind-tdep.c b/gdb/ia64-libunwind-tdep.c
index 1fb018ad9ee1..59b7df13d2fd 100644
--- a/gdb/ia64-libunwind-tdep.c
+++ b/gdb/ia64-libunwind-tdep.c
@@ -591,8 +591,9 @@ libunwind_is_initialized (void)
   return libunwind_initialized;
 }
 
+void _initialize_libunwind_frame ();
 void
-_initialize_libunwind_frame (void)
+_initialize_libunwind_frame ()
 {
   libunwind_descr_handle
     = gdbarch_data_register_post_init (libunwind_descr_init);
diff --git a/gdb/ia64-linux-nat.c b/gdb/ia64-linux-nat.c
index 361fc6ae375f..01cfa0decd5a 100644
--- a/gdb/ia64-linux-nat.c
+++ b/gdb/ia64-linux-nat.c
@@ -921,8 +921,9 @@ ia64_linux_nat_target::low_status_is_event (int status)
 				 || WSTOPSIG (status) == SIGILL);
 }
 
+void _initialize_ia64_linux_nat ();
 void
-_initialize_ia64_linux_nat (void)
+_initialize_ia64_linux_nat ()
 {
   /* Register the target.  */
   linux_target = &the_ia64_linux_nat_target;
diff --git a/gdb/ia64-linux-tdep.c b/gdb/ia64-linux-tdep.c
index 2696f14b2cb0..33684ceb90e2 100644
--- a/gdb/ia64-linux-tdep.c
+++ b/gdb/ia64-linux-tdep.c
@@ -258,8 +258,9 @@ ia64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 				      ia64_linux_stap_is_single_operand);
 }
 
+void _initialize_ia64_linux_tdep ();
 void
-_initialize_ia64_linux_tdep (void)
+_initialize_ia64_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_LINUX,
 			  ia64_linux_init_abi);
diff --git a/gdb/ia64-tdep.c b/gdb/ia64-tdep.c
index 40d4fd3c19d3..dd07b7d4e7ea 100644
--- a/gdb/ia64-tdep.c
+++ b/gdb/ia64-tdep.c
@@ -4012,8 +4012,9 @@ ia64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_ia64_tdep ();
 void
-_initialize_ia64_tdep (void)
+_initialize_ia64_tdep ()
 {
   gdbarch_register (bfd_arch_ia64, ia64_gdbarch_init, NULL);
 }
diff --git a/gdb/ia64-vms-tdep.c b/gdb/ia64-vms-tdep.c
index 211242553bf4..ca0317bc45b3 100644
--- a/gdb/ia64-vms-tdep.c
+++ b/gdb/ia64-vms-tdep.c
@@ -153,8 +153,9 @@ ia64_openvms_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 #endif
 }
 
+void _initialize_ia64_vms_tdep ();
 void
-_initialize_ia64_vms_tdep (void)
+_initialize_ia64_vms_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_OPENVMS,
 			  ia64_openvms_init_abi);
diff --git a/gdb/infcall.c b/gdb/infcall.c
index 240644a4eef9..b13c781c9d46 100644
--- a/gdb/infcall.c
+++ b/gdb/infcall.c
@@ -1507,8 +1507,9 @@ When the function is done executing, GDB will silently stop."),
   gdb_assert_not_reached ("... should not be here");
 }
 
+void _initialize_infcall ();
 void
-_initialize_infcall (void)
+_initialize_infcall ()
 {
   add_setshow_boolean_cmd ("may-call-functions", no_class,
 			   &may_call_functions_p, _("\
diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index 2bf21e26f192..cf8b312f9dbe 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -3162,8 +3162,9 @@ use \"set args\" without arguments.\n\
 \n\
 To start the inferior without using a shell, use \"set startup-with-shell off\"."
 
+void _initialize_infcmd ();
 void
-_initialize_infcmd (void)
+_initialize_infcmd ()
 {
   static struct cmd_list_element *info_proc_cmdlist;
   struct cmd_list_element *c = NULL;
diff --git a/gdb/inflow.c b/gdb/inflow.c
index 00b2235b96ed..e5e595ed981a 100644
--- a/gdb/inflow.c
+++ b/gdb/inflow.c
@@ -953,8 +953,9 @@ initialize_stdin_serial (void)
   stdin_serial = serial_fdopen (0);
 }
 
+void _initialize_inflow ();
 void
-_initialize_inflow (void)
+_initialize_inflow ()
 {
   add_info ("terminal", info_terminal_command,
 	    _("Print inferior's saved terminal status."));
diff --git a/gdb/infrun.c b/gdb/infrun.c
index a0583a8e6586..a8636284f182 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -9319,8 +9319,9 @@ infrun_async_inferior_event_handler (gdb_client_data data)
   inferior_event_handler (INF_REG_EVENT, NULL);
 }
 
+void _initialize_infrun ();
 void
-_initialize_infrun (void)
+_initialize_infrun ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/interps.c b/gdb/interps.c
index 65a01437d580..8c01091e50b9 100644
--- a/gdb/interps.c
+++ b/gdb/interps.c
@@ -439,8 +439,9 @@ current_interpreter (void)
 }
 
 /* This just adds the "interpreter-exec" command.  */
+void _initialize_interpreter ();
 void
-_initialize_interpreter (void)
+_initialize_interpreter ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/iq2000-tdep.c b/gdb/iq2000-tdep.c
index 43a4e7482a01..4b3419ead7b6 100644
--- a/gdb/iq2000-tdep.c
+++ b/gdb/iq2000-tdep.c
@@ -839,8 +839,9 @@ iq2000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
    Initializer function for the iq2000 module.
    Called by gdb at start-up.  */
 
+void _initialize_iq2000_tdep ();
 void
-_initialize_iq2000_tdep (void)
+_initialize_iq2000_tdep ()
 {
   register_gdbarch_init (bfd_arch_iq2000, iq2000_gdbarch_init);
 }
diff --git a/gdb/jit.c b/gdb/jit.c
index 539753717b91..eeaab70bfe0e 100644
--- a/gdb/jit.c
+++ b/gdb/jit.c
@@ -1404,8 +1404,9 @@ jit_gdbarch_data_init (struct obstack *obstack)
   return data;
 }
 
+void _initialize_jit ();
 void
-_initialize_jit (void)
+_initialize_jit ()
 {
   jit_reader_dir = relocate_gdb_directory (JIT_READER_DIR,
 					   JIT_READER_DIR_RELOCATABLE);
diff --git a/gdb/language.c b/gdb/language.c
index 8f50af8b22dd..03985d3e0cc0 100644
--- a/gdb/language.c
+++ b/gdb/language.c
@@ -1136,8 +1136,9 @@ language_lookup_primitive_type_as_symbol (const struct language_defn *la,
 
 /* Initialize the language routines.  */
 
+void _initialize_language ();
 void
-_initialize_language (void)
+_initialize_language ()
 {
   static const char *const type_or_range_names[]
     = { "on", "off", "warn", "auto", NULL };
diff --git a/gdb/linux-fork.c b/gdb/linux-fork.c
index c77fb6c73ac9..284f1985d0dc 100644
--- a/gdb/linux-fork.c
+++ b/gdb/linux-fork.c
@@ -751,8 +751,9 @@ restart_command (const char *args, int from_tty)
   linux_fork_context (fp, from_tty);
 }
 
+void _initialize_linux_fork ();
 void
-_initialize_linux_fork (void)
+_initialize_linux_fork ()
 {
   /* Checkpoint command: create a fork of the inferior process
      and set it aside for later debugging.  */
diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 45b71ea8627f..66004e5be81a 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -4545,8 +4545,9 @@ current_lwp_ptid (void)
   return inferior_ptid;
 }
 
+void _initialize_linux_nat ();
 void
-_initialize_linux_nat (void)
+_initialize_linux_nat ()
 {
   add_setshow_zuinteger_cmd ("lin-lwp", class_maintenance,
 			     &debug_linux_nat, _("\
diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c
index 820657a1038e..b6374ce399c7 100644
--- a/gdb/linux-tdep.c
+++ b/gdb/linux-tdep.c
@@ -2486,8 +2486,9 @@ linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
 }
 
+void _initialize_linux_tdep ();
 void
-_initialize_linux_tdep (void)
+_initialize_linux_tdep ()
 {
   linux_gdbarch_data_handle =
     gdbarch_data_register_post_init (init_linux_gdbarch_data);
diff --git a/gdb/linux-thread-db.c b/gdb/linux-thread-db.c
index ed37de6d198d..ae29c51673a4 100644
--- a/gdb/linux-thread-db.c
+++ b/gdb/linux-thread-db.c
@@ -1968,8 +1968,9 @@ maintenance_check_libthread_db (const char *args, int from_tty)
   check_thread_db (info, true);
 }
 
+void _initialize_thread_db ();
 void
-_initialize_thread_db (void)
+_initialize_thread_db ()
 {
   /* Defer loading of libthread_db.so until inferior is running.
      This allows gdb to load correct libthread_db for a given
diff --git a/gdb/lm32-tdep.c b/gdb/lm32-tdep.c
index 78ba1b022703..f2c3fea48a77 100644
--- a/gdb/lm32-tdep.c
+++ b/gdb/lm32-tdep.c
@@ -549,8 +549,9 @@ lm32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_lm32_tdep ();
 void
-_initialize_lm32_tdep (void)
+_initialize_lm32_tdep ()
 {
   register_gdbarch_init (bfd_arch_lm32, lm32_gdbarch_init);
 }
diff --git a/gdb/m2-lang.c b/gdb/m2-lang.c
index 8a167113482d..1a97a58cec4f 100644
--- a/gdb/m2-lang.c
+++ b/gdb/m2-lang.c
@@ -457,8 +457,9 @@ builtin_m2_type (struct gdbarch *gdbarch)
 
 /* Initialization for Modula-2 */
 
+void _initialize_m2_language ();
 void
-_initialize_m2_language (void)
+_initialize_m2_language ()
 {
   m2_type_data = gdbarch_data_register_post_init (build_m2_types);
 }
diff --git a/gdb/m32c-tdep.c b/gdb/m32c-tdep.c
index 0d6324104b9f..31f4d24cac5d 100644
--- a/gdb/m32c-tdep.c
+++ b/gdb/m32c-tdep.c
@@ -2644,8 +2644,9 @@ m32c_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_m32c_tdep ();
 void
-_initialize_m32c_tdep (void)
+_initialize_m32c_tdep ()
 {
   register_gdbarch_init (bfd_arch_m32c, m32c_gdbarch_init);
 
diff --git a/gdb/m32r-linux-nat.c b/gdb/m32r-linux-nat.c
index 6bb833778824..24beeca3b75c 100644
--- a/gdb/m32r-linux-nat.c
+++ b/gdb/m32r-linux-nat.c
@@ -237,8 +237,9 @@ m32r_linux_nat_target::store_registers (struct regcache *regcache, int regno)
 		  _("Got request to store bad register number %d."), regno);
 }
 
+void _initialize_m32r_linux_nat ();
 void
-_initialize_m32r_linux_nat (void)
+_initialize_m32r_linux_nat ()
 {
   /* Register the target.  */
   linux_target = &the_m32r_linux_nat_target;
diff --git a/gdb/m32r-linux-tdep.c b/gdb/m32r-linux-tdep.c
index 8f516b1a70f8..becd6434c221 100644
--- a/gdb/m32r-linux-tdep.c
+++ b/gdb/m32r-linux-tdep.c
@@ -471,8 +471,9 @@ m32r_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
                                              svr4_fetch_objfile_link_map);
 }
 
+void _initialize_m32r_linux_tdep ();
 void
-_initialize_m32r_linux_tdep (void)
+_initialize_m32r_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_m32r, 0, GDB_OSABI_LINUX,
 			  m32r_linux_init_abi);
diff --git a/gdb/m32r-tdep.c b/gdb/m32r-tdep.c
index 59f9bb59be94..60e53876408c 100644
--- a/gdb/m32r-tdep.c
+++ b/gdb/m32r-tdep.c
@@ -911,8 +911,9 @@ m32r_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_m32r_tdep ();
 void
-_initialize_m32r_tdep (void)
+_initialize_m32r_tdep ()
 {
   register_gdbarch_init (bfd_arch_m32r, m32r_gdbarch_init);
 }
diff --git a/gdb/m68hc11-tdep.c b/gdb/m68hc11-tdep.c
index ff0395da4f3d..4e63c2f2fa0d 100644
--- a/gdb/m68hc11-tdep.c
+++ b/gdb/m68hc11-tdep.c
@@ -1512,8 +1512,9 @@ m68hc11_gdbarch_init (struct gdbarch_info info,
   return gdbarch;
 }
 
+void _initialize_m68hc11_tdep ();
 void
-_initialize_m68hc11_tdep (void)
+_initialize_m68hc11_tdep ()
 {
   register_gdbarch_init (bfd_arch_m68hc11, m68hc11_gdbarch_init);
   register_gdbarch_init (bfd_arch_m68hc12, m68hc11_gdbarch_init);
diff --git a/gdb/m68k-bsd-nat.c b/gdb/m68k-bsd-nat.c
index 562505be045a..184b5c25d724 100644
--- a/gdb/m68k-bsd-nat.c
+++ b/gdb/m68k-bsd-nat.c
@@ -221,8 +221,9 @@ m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
   return 1;
 }
 
+void _initialize_m68kbsd_nat ();
 void
-_initialize_m68kbsd_nat (void)
+_initialize_m68kbsd_nat ()
 {
   add_inf_child_target (&the_m68k_bsd_nat_target);
 
diff --git a/gdb/m68k-bsd-tdep.c b/gdb/m68k-bsd-tdep.c
index 48b230df44e4..f18f33dc7e4d 100644
--- a/gdb/m68k-bsd-tdep.c
+++ b/gdb/m68k-bsd-tdep.c
@@ -152,8 +152,9 @@ m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 }
 
+void _initialize_m68kbsd_tdep ();
 void
-_initialize_m68kbsd_tdep (void)
+_initialize_m68kbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD,
 			  m68kbsd_init_abi);
diff --git a/gdb/m68k-linux-nat.c b/gdb/m68k-linux-nat.c
index 3b2971b5a4e2..5e9170d9de72 100644
--- a/gdb/m68k-linux-nat.c
+++ b/gdb/m68k-linux-nat.c
@@ -511,8 +511,9 @@ ps_get_thread_area (struct ps_prochandle *ph,
   return PS_OK;
 }
 
+void _initialize_m68k_linux_nat ();
 void
-_initialize_m68k_linux_nat (void)
+_initialize_m68k_linux_nat ()
 {
   /* Register the target.  */
   linux_target = &the_m68k_linux_nat_target;
diff --git a/gdb/m68k-linux-tdep.c b/gdb/m68k-linux-tdep.c
index 7b571f5db471..dcc7e089608e 100644
--- a/gdb/m68k-linux-tdep.c
+++ b/gdb/m68k-linux-tdep.c
@@ -423,8 +423,9 @@ m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
                                              svr4_fetch_objfile_link_map);
 }
 
+void _initialize_m68k_linux_tdep ();
 void
-_initialize_m68k_linux_tdep (void)
+_initialize_m68k_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_LINUX,
 			  m68k_linux_init_abi);
diff --git a/gdb/m68k-tdep.c b/gdb/m68k-tdep.c
index 365b7c8b623d..ec754a62af93 100644
--- a/gdb/m68k-tdep.c
+++ b/gdb/m68k-tdep.c
@@ -1281,8 +1281,9 @@ m68k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
     return;
 }
 
+void _initialize_m68k_tdep ();
 void
-_initialize_m68k_tdep (void)
+_initialize_m68k_tdep ()
 {
   gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep);
 }
diff --git a/gdb/machoread.c b/gdb/machoread.c
index 2bb3ab32cb30..54e3d2adc115 100644
--- a/gdb/machoread.c
+++ b/gdb/machoread.c
@@ -961,8 +961,9 @@ static const struct sym_fns macho_sym_fns = {
   &psym_functions
 };
 
+void _initialize_machoread ();
 void
-_initialize_machoread (void)
+_initialize_machoread ()
 {
   add_symtab_fns (bfd_target_mach_o_flavour, &macho_sym_fns);
 
diff --git a/gdb/macrocmd.c b/gdb/macrocmd.c
index 70b95b107ea0..54aa35e72fe0 100644
--- a/gdb/macrocmd.c
+++ b/gdb/macrocmd.c
@@ -458,8 +458,9 @@ macro_list_command (const char *exp, int from_tty)
 
 /* Initializing the `macrocmd' module.  */
 
+void _initialize_macrocmd ();
 void
-_initialize_macrocmd (void)
+_initialize_macrocmd ()
 {
   /* We introduce a new command prefix, `macro', under which we'll put
      the various commands for working with preprocessor macros.  */
diff --git a/gdb/macroscope.c b/gdb/macroscope.c
index af8a2eedc4c6..9a1e7fe633be 100644
--- a/gdb/macroscope.c
+++ b/gdb/macroscope.c
@@ -152,8 +152,9 @@ standard_macro_lookup (const char *name, void *baton)
   return result;
 }
 
+void _initialize_macroscope ();
 void
-_initialize_macroscope (void)
+_initialize_macroscope ()
 {
   macro_user_macros = new_macro_table (NULL, NULL, NULL);
   macro_set_main (macro_user_macros, "<user-defined>");
diff --git a/gdb/maint-test-options.c b/gdb/maint-test-options.c
index 842a080460a0..2cbdc7c1a202 100644
--- a/gdb/maint-test-options.c
+++ b/gdb/maint-test-options.c
@@ -424,6 +424,7 @@ maintenance_test_options_command (const char *arg, int from_tty)
 }
 
 
+void _initialize_maint_test_options ();
 void
 _initialize_maint_test_options ()
 {
diff --git a/gdb/maint-test-settings.c b/gdb/maint-test-settings.c
index d8a6e9bb84a2..e8e8874e9a84 100644
--- a/gdb/maint-test-settings.c
+++ b/gdb/maint-test-settings.c
@@ -99,8 +99,9 @@ maintenance_show_test_settings_value_cmd
 }
 
 
+void _initialize_maint_test_settings ();
 void
-_initialize_maint_test_settings (void)
+_initialize_maint_test_settings ()
 {
   maintenance_test_settings_filename = xstrdup ("/foo/bar");
 
diff --git a/gdb/maint.c b/gdb/maint.c
index fcb9f4efb5eb..e8e0f287731f 100644
--- a/gdb/maint.c
+++ b/gdb/maint.c
@@ -1135,8 +1135,9 @@ Selftests have been disabled for this build.\n"));
 }
 
 
+void _initialize_maint_cmds ();
 void
-_initialize_maint_cmds (void)
+_initialize_maint_cmds ()
 {
   struct cmd_list_element *cmd;
 
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index ff1d13032210..b1994f1e0b43 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -4802,8 +4802,9 @@ elfmdebug_build_psymtabs (struct objfile *objfile,
   reader.install ();
 }
 
+void _initialize_mdebugread ();
 void
-_initialize_mdebugread (void)
+_initialize_mdebugread ()
 {
   mdebug_register_index
     = register_symbol_register_impl (LOC_REGISTER, &mdebug_register_funcs);
diff --git a/gdb/memattr.c b/gdb/memattr.c
index f8cd6f4fb1f7..da60df071c5b 100644
--- a/gdb/memattr.c
+++ b/gdb/memattr.c
@@ -594,8 +594,9 @@ dummy_cmd (const char *args, int from_tty)
 static struct cmd_list_element *mem_set_cmdlist;
 static struct cmd_list_element *mem_show_cmdlist;
 
+void _initialize_mem ();
 void
-_initialize_mem (void)
+_initialize_mem ()
 {
   add_com ("mem", class_vars, mem_command, _("\
 Define attributes for memory region or reset memory region handling to "
diff --git a/gdb/mep-tdep.c b/gdb/mep-tdep.c
index 13817555a5e1..7e8247cd6427 100644
--- a/gdb/mep-tdep.c
+++ b/gdb/mep-tdep.c
@@ -2448,8 +2448,9 @@ mep_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_mep_tdep ();
 void
-_initialize_mep_tdep (void)
+_initialize_mep_tdep ()
 {
   mep_csr_reggroup = reggroup_new ("csr", USER_REGGROUP);
   mep_cr_reggroup  = reggroup_new ("cr", USER_REGGROUP); 
diff --git a/gdb/mi/mi-cmd-env.c b/gdb/mi/mi-cmd-env.c
index 7514ba8fb103..88158cee56f7 100644
--- a/gdb/mi/mi-cmd-env.c
+++ b/gdb/mi/mi-cmd-env.c
@@ -261,8 +261,9 @@ mi_cmd_inferior_tty_show (const char *command, char **argv, int argc)
     current_uiout->field_string ("inferior_tty_terminal", inferior_io_terminal);
 }
 
+void _initialize_mi_cmd_env ();
 void 
-_initialize_mi_cmd_env (void)
+_initialize_mi_cmd_env ()
 {
   const char *env;
 
diff --git a/gdb/mi/mi-cmds.c b/gdb/mi/mi-cmds.c
index eadf612b1440..ec6f281c5b96 100644
--- a/gdb/mi/mi-cmds.c
+++ b/gdb/mi/mi-cmds.c
@@ -295,8 +295,9 @@ build_table (struct mi_cmd *commands)
     }
 }
 
+void _initialize_mi_cmds ();
 void
-_initialize_mi_cmds (void)
+_initialize_mi_cmds ()
 {
   build_table (mi_cmds);
   memset (&stats, 0, sizeof (stats));
diff --git a/gdb/mi/mi-interp.c b/gdb/mi/mi-interp.c
index 556f446c2e19..2ac4c119961c 100644
--- a/gdb/mi/mi-interp.c
+++ b/gdb/mi/mi-interp.c
@@ -1335,8 +1335,9 @@ mi_interp_factory (const char *name)
   return new mi_interp (name);
 }
 
+void _initialize_mi_interp ();
 void
-_initialize_mi_interp (void)
+_initialize_mi_interp ()
 {
   /* The various interpreter levels.  */
   interp_factory_register (INTERP_MI1, mi_interp_factory);
diff --git a/gdb/mi/mi-main.c b/gdb/mi/mi-main.c
index 24daf3f88388..014feaf64937 100644
--- a/gdb/mi/mi-main.c
+++ b/gdb/mi/mi-main.c
@@ -2749,8 +2749,9 @@ mi_cmd_complete (const char *command, char **argv, int argc)
 }
 
 
+void _initialize_mi_main ();
 void
-_initialize_mi_main (void)
+_initialize_mi_main ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/microblaze-linux-tdep.c b/gdb/microblaze-linux-tdep.c
index 3bb9b5682ac7..be710bedb649 100644
--- a/gdb/microblaze-linux-tdep.c
+++ b/gdb/microblaze-linux-tdep.c
@@ -131,8 +131,9 @@ microblaze_linux_init_abi (struct gdbarch_info info,
 				&microblaze_linux_sighandler_tramp_frame);
 }
 
+void _initialize_microblaze_linux_tdep ();
 void
-_initialize_microblaze_linux_tdep (void)
+_initialize_microblaze_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_microblaze, 0, GDB_OSABI_LINUX, 
 			  microblaze_linux_init_abi);
diff --git a/gdb/microblaze-tdep.c b/gdb/microblaze-tdep.c
index 17871229c807..a05088c36a10 100644
--- a/gdb/microblaze-tdep.c
+++ b/gdb/microblaze-tdep.c
@@ -753,8 +753,9 @@ microblaze_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_microblaze_tdep ();
 void
-_initialize_microblaze_tdep (void)
+_initialize_microblaze_tdep ()
 {
   register_gdbarch_init (bfd_arch_microblaze, microblaze_gdbarch_init);
 
diff --git a/gdb/mips-fbsd-nat.c b/gdb/mips-fbsd-nat.c
index cb74f19333b0..4a29ee1cb563 100644
--- a/gdb/mips-fbsd-nat.c
+++ b/gdb/mips-fbsd-nat.c
@@ -126,8 +126,9 @@ mips_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
     }
 }
 
+void _initialize_mips_fbsd_nat ();
 void
-_initialize_mips_fbsd_nat (void)
+_initialize_mips_fbsd_nat ()
 {
   add_inf_child_target (&the_mips_fbsd_nat_target);
 }
diff --git a/gdb/mips-fbsd-tdep.c b/gdb/mips-fbsd-tdep.c
index 76073f01e631..abaf7f2474ab 100644
--- a/gdb/mips-fbsd-tdep.c
+++ b/gdb/mips-fbsd-tdep.c
@@ -553,8 +553,9 @@ mips_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 	       mips_fbsd_lp64_fetch_link_map_offsets));
 }
 
+void _initialize_mips_fbsd_tdep ();
 void
-_initialize_mips_fbsd_tdep (void)
+_initialize_mips_fbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_FREEBSD,
 			  mips_fbsd_init_abi);
diff --git a/gdb/mips-linux-nat.c b/gdb/mips-linux-nat.c
index 104c972f2463..38ff461a35b3 100644
--- a/gdb/mips-linux-nat.c
+++ b/gdb/mips-linux-nat.c
@@ -783,8 +783,9 @@ mips_linux_nat_target::close ()
   linux_nat_trad_target::close ();
 }
 
+void _initialize_mips_linux_nat ();
 void
-_initialize_mips_linux_nat (void)
+_initialize_mips_linux_nat ()
 {
   add_setshow_boolean_cmd ("show-debug-regs", class_maintenance,
 			   &show_debug_regs, _("\
diff --git a/gdb/mips-linux-tdep.c b/gdb/mips-linux-tdep.c
index 002c5c51d96c..aa7b8d11f3fb 100644
--- a/gdb/mips-linux-tdep.c
+++ b/gdb/mips-linux-tdep.c
@@ -1642,8 +1642,9 @@ mips_linux_init_abi (struct gdbarch_info info,
     }
 }
 
+void _initialize_mips_linux_tdep ();
 void
-_initialize_mips_linux_tdep (void)
+_initialize_mips_linux_tdep ()
 {
   const struct bfd_arch_info *arch_info;
 
diff --git a/gdb/mips-nbsd-nat.c b/gdb/mips-nbsd-nat.c
index 4f6a8eedb0a1..527c67a7abc5 100644
--- a/gdb/mips-nbsd-nat.c
+++ b/gdb/mips-nbsd-nat.c
@@ -113,8 +113,9 @@ mips_nbsd_nat_target::store_registers (struct regcache *regcache, int regno)
     }
 }
 
+void _initialize_mipsnbsd_nat ();
 void
-_initialize_mipsnbsd_nat (void)
+_initialize_mipsnbsd_nat ()
 {
   add_inf_child_target (&the_mips_nbsd_nat_target);
 }
diff --git a/gdb/mips-nbsd-tdep.c b/gdb/mips-nbsd-tdep.c
index a2901c09edff..38bc7ce636b0 100644
--- a/gdb/mips-nbsd-tdep.c
+++ b/gdb/mips-nbsd-tdep.c
@@ -371,8 +371,9 @@ mipsnbsd_init_abi (struct gdbarch_info info,
 	       mipsnbsd_lp64_fetch_link_map_offsets));
 }
 
+void _initialize_mipsnbsd_tdep ();
 void
-_initialize_mipsnbsd_tdep (void)
+_initialize_mipsnbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_NETBSD,
 			  mipsnbsd_init_abi);
diff --git a/gdb/mips-sde-tdep.c b/gdb/mips-sde-tdep.c
index 01afafb1fa61..685c3c7263c0 100644
--- a/gdb/mips-sde-tdep.c
+++ b/gdb/mips-sde-tdep.c
@@ -256,8 +256,9 @@ mips_sde_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   frame_base_append_sniffer (gdbarch, mips_sde_frame_base_sniffer);
 }
 
+void _initialize_mips_sde_tdep ();
 void
-_initialize_mips_sde_tdep (void)
+_initialize_mips_sde_tdep ()
 {
   gdbarch_register_osabi_sniffer (bfd_arch_mips,
 				  bfd_target_elf_flavour,
diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
index f89e37b503e3..90ec3707c5db 100644
--- a/gdb/mips-tdep.c
+++ b/gdb/mips-tdep.c
@@ -8971,8 +8971,9 @@ mips_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
 		      mips_fpu_type_str (MIPS_FPU_TYPE (gdbarch)));
 }
 
+void _initialize_mips_tdep ();
 void
-_initialize_mips_tdep (void)
+_initialize_mips_tdep ()
 {
   static struct cmd_list_element *mipsfpulist = NULL;
 
diff --git a/gdb/mips64-obsd-nat.c b/gdb/mips64-obsd-nat.c
index 8ea8fb1cc9ad..3661fff097a0 100644
--- a/gdb/mips64-obsd-nat.c
+++ b/gdb/mips64-obsd-nat.c
@@ -115,8 +115,9 @@ mips64_obsd_nat_target::store_registers (struct regcache *regcache, int regnum)
     perror_with_name (_("Couldn't write registers"));
 }
 
+void _initialize_mips64obsd_nat ();
 void
-_initialize_mips64obsd_nat (void)
+_initialize_mips64obsd_nat ()
 {
   add_inf_child_target (&the_mips64_obsd_nat_target);
 }
diff --git a/gdb/mips64-obsd-tdep.c b/gdb/mips64-obsd-tdep.c
index 857ff7a3362e..3194ce862bd4 100644
--- a/gdb/mips64-obsd-tdep.c
+++ b/gdb/mips64-obsd-tdep.c
@@ -159,8 +159,9 @@ mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 }
 
+void _initialize_mips64obsd_tdep ();
 void
-_initialize_mips64obsd_tdep (void)
+_initialize_mips64obsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD,
 			  mips64obsd_init_abi);
diff --git a/gdb/mipsread.c b/gdb/mipsread.c
index 2c11873d4449..6e39538e952d 100644
--- a/gdb/mipsread.c
+++ b/gdb/mipsread.c
@@ -379,8 +379,9 @@ static const struct sym_fns ecoff_sym_fns =
   &psym_functions
 };
 
+void _initialize_mipsread ();
 void
-_initialize_mipsread (void)
+_initialize_mipsread ()
 {
   add_symtab_fns (bfd_target_ecoff_flavour, &ecoff_sym_fns);
 }
diff --git a/gdb/mn10300-linux-tdep.c b/gdb/mn10300-linux-tdep.c
index 24f40b9b22ef..1dfe2a21cf93 100644
--- a/gdb/mn10300-linux-tdep.c
+++ b/gdb/mn10300-linux-tdep.c
@@ -715,8 +715,9 @@ am33_linux_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tramp_frame_prepend_unwinder (gdbarch, &am33_linux_rt_sigframe);
 }
 
+void _initialize_mn10300_linux_tdep ();
 void
-_initialize_mn10300_linux_tdep (void)
+_initialize_mn10300_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_mn10300, 0,
 			  GDB_OSABI_LINUX, am33_linux_init_osabi);
diff --git a/gdb/mn10300-tdep.c b/gdb/mn10300-tdep.c
index b472c36ebf1b..d779ad1dd0d8 100644
--- a/gdb/mn10300-tdep.c
+++ b/gdb/mn10300-tdep.c
@@ -1417,8 +1417,9 @@ mn10300_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
 		      tdep->am33_mode);
 }
 
+void _initialize_mn10300_tdep ();
 void
-_initialize_mn10300_tdep (void)
+_initialize_mn10300_tdep ()
 {
   gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep);
 }
diff --git a/gdb/moxie-tdep.c b/gdb/moxie-tdep.c
index b3ffbfb62ed8..1f552481662c 100644
--- a/gdb/moxie-tdep.c
+++ b/gdb/moxie-tdep.c
@@ -1103,8 +1103,9 @@ moxie_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
 /* Register this machine's init routine.  */
 
+void _initialize_moxie_tdep ();
 void
-_initialize_moxie_tdep (void)
+_initialize_moxie_tdep ()
 {
   register_gdbarch_init (bfd_arch_moxie, moxie_gdbarch_init);
 }
diff --git a/gdb/msp430-tdep.c b/gdb/msp430-tdep.c
index 1b38396a8b3e..0893274686ee 100644
--- a/gdb/msp430-tdep.c
+++ b/gdb/msp430-tdep.c
@@ -986,8 +986,9 @@ msp430_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
 /* Register the initialization routine.  */
 
+void _initialize_msp430_tdep ();
 void
-_initialize_msp430_tdep (void)
+_initialize_msp430_tdep ()
 {
   register_gdbarch_init (bfd_arch_msp430, msp430_gdbarch_init);
 }
diff --git a/gdb/nds32-tdep.c b/gdb/nds32-tdep.c
index 8d9bac085b6e..5238fe54a71b 100644
--- a/gdb/nds32-tdep.c
+++ b/gdb/nds32-tdep.c
@@ -2096,8 +2096,9 @@ nds32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_nds32_tdep ();
 void
-_initialize_nds32_tdep (void)
+_initialize_nds32_tdep ()
 {
   /* Initialize gdbarch.  */
   register_gdbarch_init (bfd_arch_nds32, nds32_gdbarch_init);
diff --git a/gdb/nios2-linux-tdep.c b/gdb/nios2-linux-tdep.c
index 3078bc4bb672..345dfeb9235e 100644
--- a/gdb/nios2-linux-tdep.c
+++ b/gdb/nios2-linux-tdep.c
@@ -248,8 +248,9 @@ nios2_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->jb_pc = 10;
 }
 
+void _initialize_nios2_linux_tdep ();
 void
-_initialize_nios2_linux_tdep (void)
+_initialize_nios2_linux_tdep ()
 {
 
   const struct bfd_arch_info *arch_info;
diff --git a/gdb/nios2-tdep.c b/gdb/nios2-tdep.c
index 6e00a322d24e..cb669da24802 100644
--- a/gdb/nios2-tdep.c
+++ b/gdb/nios2-tdep.c
@@ -2390,8 +2390,9 @@ nios2_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_nios2_tdep ();
 void
-_initialize_nios2_tdep (void)
+_initialize_nios2_tdep ()
 {
   gdbarch_register (bfd_arch_nios2, nios2_gdbarch_init, NULL);
   initialize_tdesc_nios2 ();
diff --git a/gdb/nto-procfs.c b/gdb/nto-procfs.c
index c31dbf136c8c..58e572c094db 100644
--- a/gdb/nto-procfs.c
+++ b/gdb/nto-procfs.c
@@ -1505,8 +1505,9 @@ init_procfs_targets (void)
 
 #define OSTYPE_NTO 1
 
+void _initialize_procfs ();
 void
-_initialize_procfs (void)
+_initialize_procfs ()
 {
   sigset_t set;
 
diff --git a/gdb/objc-lang.c b/gdb/objc-lang.c
index c423d575db80..5adf913a5e33 100644
--- a/gdb/objc-lang.c
+++ b/gdb/objc-lang.c
@@ -1332,8 +1332,9 @@ find_objc_msgcall (CORE_ADDR pc, CORE_ADDR *new_pc)
   return 0;
 }
 
+void _initialize_objc_language ();
 void
-_initialize_objc_language (void)
+_initialize_objc_language ()
 {
   add_info ("selectors", info_selectors_command,
 	    _("All Objective-C selectors, or those matching REGEXP."));
diff --git a/gdb/observable.c b/gdb/observable.c
index 5a66be080192..81aa392cc21f 100644
--- a/gdb/observable.c
+++ b/gdb/observable.c
@@ -87,8 +87,9 @@ show_observer_debug (struct ui_file *file, int from_tty,
   fprintf_filtered (file, _("Observer debugging is %s.\n"), value);
 }
 
+void _initialize_observer ();
 void
-_initialize_observer (void)
+_initialize_observer ()
 {
   add_setshow_zuinteger_cmd ("observer", class_maintenance,
 			     &gdb::observers::observer_debug, _("\
diff --git a/gdb/opencl-lang.c b/gdb/opencl-lang.c
index e5052bbd6ceb..1763590214fd 100644
--- a/gdb/opencl-lang.c
+++ b/gdb/opencl-lang.c
@@ -1178,8 +1178,9 @@ build_opencl_types (struct gdbarch *gdbarch)
   return types;
 }
 
+void _initialize_opencl_language ();
 void
-_initialize_opencl_language (void)
+_initialize_opencl_language ()
 {
   opencl_type_data = gdbarch_data_register_post_init (build_opencl_types);
 }
diff --git a/gdb/or1k-linux-tdep.c b/gdb/or1k-linux-tdep.c
index 860144aa350e..15677f9cfaf6 100644
--- a/gdb/or1k-linux-tdep.c
+++ b/gdb/or1k-linux-tdep.c
@@ -163,8 +163,9 @@ or1k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
 /* Initialize OpenRISC Linux target support.  */
 
+void _initialize_or1k_linux_tdep ();
 void
-_initialize_or1k_linux_tdep (void)
+_initialize_or1k_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_or1k, 0, GDB_OSABI_LINUX,
 			  or1k_linux_init_abi);
diff --git a/gdb/or1k-tdep.c b/gdb/or1k-tdep.c
index eca780a9c12a..772ecff33491 100644
--- a/gdb/or1k-tdep.c
+++ b/gdb/or1k-tdep.c
@@ -1269,8 +1269,9 @@ or1k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
 }
 
 
+void _initialize_or1k_tdep ();
 void
-_initialize_or1k_tdep (void)
+_initialize_or1k_tdep ()
 {
   /* Register this architecture.  */
   gdbarch_register (bfd_arch_or1k, or1k_gdbarch_init, or1k_dump_tdep);
diff --git a/gdb/osabi.c b/gdb/osabi.c
index dec1bddc4cef..b9a8687a7cc3 100644
--- a/gdb/osabi.c
+++ b/gdb/osabi.c
@@ -653,8 +653,9 @@ show_osabi (struct ui_file *file, int from_tty, struct cmd_list_element *c,
 		      gdbarch_osabi_name (GDB_OSABI_DEFAULT));
 }
 
+void _initialize_gdb_osabi ();
 void
-_initialize_gdb_osabi (void)
+_initialize_gdb_osabi ()
 {
   if (strcmp (gdb_osabi_names[GDB_OSABI_INVALID].pretty, "<invalid>") != 0)
     internal_error
diff --git a/gdb/osdata.c b/gdb/osdata.c
index 19b663693dd7..9b0604752129 100644
--- a/gdb/osdata.c
+++ b/gdb/osdata.c
@@ -289,8 +289,9 @@ info_osdata_command (const char *arg, int from_tty)
   info_osdata (arg);
 }
 
+void _initialize_osdata ();
 void
-_initialize_osdata (void)
+_initialize_osdata ()
 {
   add_info ("os", info_osdata_command,
            _("Show OS data ARG."));
diff --git a/gdb/p-valprint.c b/gdb/p-valprint.c
index e337132a07d6..aaeb4b67e983 100644
--- a/gdb/p-valprint.c
+++ b/gdb/p-valprint.c
@@ -891,8 +891,9 @@ pascal_object_print_static_field (struct value *val,
   common_val_print (val, stream, recurse, &opts, current_language);
 }
 
+void _initialize_pascal_valprint ();
 void
-_initialize_pascal_valprint (void)
+_initialize_pascal_valprint ()
 {
   add_setshow_boolean_cmd ("pascal_static-members", class_support,
 			   &user_print_options.pascal_static_field_print, _("\
diff --git a/gdb/parse.c b/gdb/parse.c
index 65e3c6008cdf..b4d9005de55d 100644
--- a/gdb/parse.c
+++ b/gdb/parse.c
@@ -1436,8 +1436,9 @@ increase_expout_size (struct expr_builder *ps, size_t lenelt)
     }
 }
 
+void _initialize_parse ();
 void
-_initialize_parse (void)
+_initialize_parse ()
 {
   add_setshow_zuinteger_cmd ("expression", class_maintenance,
 			     &expressiondebug,
diff --git a/gdb/ppc-fbsd-nat.c b/gdb/ppc-fbsd-nat.c
index 5643fab82e7f..a1b268ab2892 100644
--- a/gdb/ppc-fbsd-nat.c
+++ b/gdb/ppc-fbsd-nat.c
@@ -201,8 +201,9 @@ ppcfbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
   return 1;
 }
 
+void _initialize_ppcfbsd_nat ();
 void
-_initialize_ppcfbsd_nat (void)
+_initialize_ppcfbsd_nat ()
 {
   add_inf_child_target (&the_ppc_fbsd_nat_target);
 
diff --git a/gdb/ppc-fbsd-tdep.c b/gdb/ppc-fbsd-tdep.c
index 8ae108438d3b..349396f52b2c 100644
--- a/gdb/ppc-fbsd-tdep.c
+++ b/gdb/ppc-fbsd-tdep.c
@@ -361,8 +361,9 @@ ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 					ppcfbsd_get_thread_local_address);
 }
 
+void _initialize_ppcfbsd_tdep ();
 void
-_initialize_ppcfbsd_tdep (void)
+_initialize_ppcfbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD,
 			  ppcfbsd_init_abi);
diff --git a/gdb/ppc-linux-nat.c b/gdb/ppc-linux-nat.c
index d619971a001d..27fa7f93e2b3 100644
--- a/gdb/ppc-linux-nat.c
+++ b/gdb/ppc-linux-nat.c
@@ -2671,8 +2671,9 @@ ppc_linux_nat_target::read_description ()
   return ppc_linux_match_description (features);
 }
 
+void _initialize_ppc_linux_nat ();
 void
-_initialize_ppc_linux_nat (void)
+_initialize_ppc_linux_nat ()
 {
   linux_target = &the_ppc_linux_nat_target;
 
diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index 901b938f257a..676be7252176 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -2155,8 +2155,9 @@ ppc_linux_init_abi (struct gdbarch_info info,
   ppc_init_linux_record_tdep (&ppc64_linux_record_tdep, 8);
 }
 
+void _initialize_ppc_linux_tdep ();
 void
-_initialize_ppc_linux_tdep (void)
+_initialize_ppc_linux_tdep ()
 {
   /* Register for all sub-families of the POWER/PowerPC: 32-bit and
      64-bit PowerPC, and the older rs6k.  */
diff --git a/gdb/ppc-nbsd-nat.c b/gdb/ppc-nbsd-nat.c
index a6175f9e0685..a2a0c0b958e9 100644
--- a/gdb/ppc-nbsd-nat.c
+++ b/gdb/ppc-nbsd-nat.c
@@ -179,8 +179,9 @@ ppcnbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
   return 1;
 }
 
+void _initialize_ppcnbsd_nat ();
 void
-_initialize_ppcnbsd_nat (void)
+_initialize_ppcnbsd_nat ()
 {
   /* Support debugging kernel virtual memory images.  */
   bsd_kvm_add_target (ppcnbsd_supply_pcb);
diff --git a/gdb/ppc-nbsd-tdep.c b/gdb/ppc-nbsd-tdep.c
index 387f0221462d..d75930c9f8d7 100644
--- a/gdb/ppc-nbsd-tdep.c
+++ b/gdb/ppc-nbsd-tdep.c
@@ -188,8 +188,9 @@ ppcnbsd_init_abi (struct gdbarch_info info,
   tramp_frame_prepend_unwinder (gdbarch, &ppcnbsd2_sigtramp);
 }
 
+void _initialize_ppcnbsd_tdep ();
 void
-_initialize_ppcnbsd_tdep (void)
+_initialize_ppcnbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_NETBSD,
 			  ppcnbsd_init_abi);
diff --git a/gdb/ppc-obsd-nat.c b/gdb/ppc-obsd-nat.c
index 7c8335c9ad7e..8d36d2b5caf6 100644
--- a/gdb/ppc-obsd-nat.c
+++ b/gdb/ppc-obsd-nat.c
@@ -187,8 +187,9 @@ ppcobsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
   return 1;
 }
 
+void _initialize_ppcobsd_nat ();
 void
-_initialize_ppcobsd_nat (void)
+_initialize_ppcobsd_nat ()
 {
   add_inf_child_target (&the_ppc_obsd_nat_target);
 
diff --git a/gdb/ppc-obsd-tdep.c b/gdb/ppc-obsd-tdep.c
index 1288766eb48f..5f70d35180c2 100644
--- a/gdb/ppc-obsd-tdep.c
+++ b/gdb/ppc-obsd-tdep.c
@@ -261,8 +261,9 @@ ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   frame_unwind_append_unwinder (gdbarch, &ppcobsd_sigtramp_frame_unwind);
 }
 
+void _initialize_ppcobsd_tdep ();
 void
-_initialize_ppcobsd_tdep (void)
+_initialize_ppcobsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD,
 			  ppcobsd_init_abi);
diff --git a/gdb/printcmd.c b/gdb/printcmd.c
index 281ee4d284a7..5f2678c8c70b 100644
--- a/gdb/printcmd.c
+++ b/gdb/printcmd.c
@@ -2737,8 +2737,9 @@ eval_command (const char *arg, int from_tty)
   execute_command (expanded.c_str (), from_tty);
 }
 
+void _initialize_printcmd ();
 void
-_initialize_printcmd (void)
+_initialize_printcmd ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/probe.c b/gdb/probe.c
index d813b3e5e8b6..a21df73d0ec8 100644
--- a/gdb/probe.c
+++ b/gdb/probe.c
@@ -876,8 +876,9 @@ static const struct internalvar_funcs probe_funcs =
 
 std::vector<const static_probe_ops *> all_static_probe_ops;
 
+void _initialize_probe ();
 void
-_initialize_probe (void)
+_initialize_probe ()
 {
   all_static_probe_ops.push_back (&any_static_probe_ops);
 
diff --git a/gdb/proc-api.c b/gdb/proc-api.c
index 4ad1cdc06323..d7ad5031b0a2 100644
--- a/gdb/proc-api.c
+++ b/gdb/proc-api.c
@@ -416,8 +416,9 @@ proc_prettyfprint_status (long flags, int why, int what, int thread)
     }
 }
 
+void _initialize_proc_api ();
 void
-_initialize_proc_api (void)
+_initialize_proc_api ()
 {
   add_setshow_boolean_cmd ("procfs-trace", no_class, &procfs_trace, _("\
 Set tracing for /proc api calls."), _("\
diff --git a/gdb/proc-events.c b/gdb/proc-events.c
index 5fd92b5328ec..e921c47f8f05 100644
--- a/gdb/proc-events.c
+++ b/gdb/proc-events.c
@@ -762,8 +762,9 @@ proc_prettyprint_actionset (struct sigaction *actions, int verbose)
 {
 }
 
+void _initialize_proc_events ();
 void
-_initialize_proc_events (void)
+_initialize_proc_events ()
 {
   init_syscall_table ();
 }
diff --git a/gdb/proc-service.c b/gdb/proc-service.c
index 86f79ad58389..e0383700a1d7 100644
--- a/gdb/proc-service.c
+++ b/gdb/proc-service.c
@@ -212,8 +212,9 @@ ps_getpid (struct ps_prochandle *ph)
   return ph->thread->ptid.pid ();
 }
 
+void _initialize_proc_service ();
 void
-_initialize_proc_service (void)
+_initialize_proc_service ()
 {
   /* This function solely exists to make sure this module is linked
      into the final binary.  */
diff --git a/gdb/procfs.c b/gdb/procfs.c
index a59e32c6d7ad..09a036f90b98 100644
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -3700,8 +3700,9 @@ proc_untrace_sysexit_cmd (const char *args, int from_tty)
   proc_trace_syscalls (args, from_tty, PR_SYSEXIT, FLAG_RESET);
 }
 
+void _initialize_procfs ();
 void
-_initialize_procfs (void)
+_initialize_procfs ()
 {
   gdb::observers::inferior_created.attach (procfs_inferior_created);
 
diff --git a/gdb/producer.c b/gdb/producer.c
index 7e5d4478c8be..735a928f335a 100644
--- a/gdb/producer.c
+++ b/gdb/producer.c
@@ -208,6 +208,7 @@ Version 18.0 Beta";
 }
 #endif
 
+void _initialize_producer ();
 void
 _initialize_producer ()
 {
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 7caf1c6029a9..09231bf981d2 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -2154,8 +2154,9 @@ maintenance_check_psymtabs (const char *ignore, int from_tty)
       }
 }
 
+void _initialize_psymtab ();
 void
-_initialize_psymtab (void)
+_initialize_psymtab ()
 {
   add_cmd ("psymbols", class_maintenance, maintenance_print_psymbols, _("\
 Print dump of current partial symbol definitions.\n\
diff --git a/gdb/python/python.c b/gdb/python/python.c
index bf214fae6e2d..f7aadb1633c8 100644
--- a/gdb/python/python.c
+++ b/gdb/python/python.c
@@ -1730,8 +1730,9 @@ do_start_initialization ()
 /* See python.h.  */
 cmd_list_element *python_cmd_element = nullptr;
 
+void _initialize_python ();
 void
-_initialize_python (void)
+_initialize_python ()
 {
   add_com ("python-interactive", class_obscure,
 	   python_interactive_command,
diff --git a/gdb/ravenscar-thread.c b/gdb/ravenscar-thread.c
index 59fdfaba7946..5d24c59e9969 100644
--- a/gdb/ravenscar-thread.c
+++ b/gdb/ravenscar-thread.c
@@ -598,6 +598,7 @@ Support for Ravenscar task/thread switching is disabled\n"));
 /* Module startup initialization function, automagically called by
    init.c.  */
 
+void _initialize_ravenscar ();
 void
 _initialize_ravenscar ()
 {
diff --git a/gdb/record-btrace.c b/gdb/record-btrace.c
index 7e5b7860df6e..33ee4e9d8170 100644
--- a/gdb/record-btrace.c
+++ b/gdb/record-btrace.c
@@ -3147,8 +3147,9 @@ show_record_pt_buffer_size_value (struct ui_file *file, int from_tty,
 
 /* Initialize btrace commands.  */
 
+void _initialize_record_btrace ();
 void
-_initialize_record_btrace (void)
+_initialize_record_btrace ()
 {
   add_prefix_cmd ("btrace", class_obscure, cmd_record_btrace_start,
 		  _("Start branch trace recording."), &record_btrace_cmdlist,
diff --git a/gdb/record-full.c b/gdb/record-full.c
index f759a5185fd2..16966220e0f0 100644
--- a/gdb/record-full.c
+++ b/gdb/record-full.c
@@ -2812,8 +2812,9 @@ show_record_full_command (const char *args, int from_tty)
   cmd_show_list (show_record_full_cmdlist, from_tty, "");
 }
 
+void _initialize_record_full ();
 void
-_initialize_record_full (void)
+_initialize_record_full ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/record.c b/gdb/record.c
index 51d2a94a2bf7..94600eb5e7ee 100644
--- a/gdb/record.c
+++ b/gdb/record.c
@@ -772,8 +772,9 @@ set_record_call_history_size (const char *args, int from_tty,
 			 &record_call_history_size);
 }
 
+void _initialize_record ();
 void
-_initialize_record (void)
+_initialize_record ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/regcache-dump.c b/gdb/regcache-dump.c
index 7d4455ad57c0..10f6e49a786d 100644
--- a/gdb/regcache-dump.c
+++ b/gdb/regcache-dump.c
@@ -305,8 +305,9 @@ maintenance_print_remote_registers (const char *args, int from_tty)
   regcache_print (args, regcache_dump_remote);
 }
 
+void _initialize_regcache_dump ();
 void
-_initialize_regcache_dump (void)
+_initialize_regcache_dump ()
 {
   add_cmd ("registers", class_maintenance, maintenance_print_registers,
 	   _("Print the internal register configuration.\n"
diff --git a/gdb/regcache.c b/gdb/regcache.c
index b9f1b0a349fd..4f079c91a7f2 100644
--- a/gdb/regcache.c
+++ b/gdb/regcache.c
@@ -1854,8 +1854,9 @@ cooked_write_test (struct gdbarch *gdbarch)
 } // namespace selftests
 #endif /* GDB_SELF_TEST */
 
+void _initialize_regcache ();
 void
-_initialize_regcache (void)
+_initialize_regcache ()
 {
   regcache_descr_handle
     = gdbarch_data_register_post_init (init_regcache_descr);
diff --git a/gdb/reggroups.c b/gdb/reggroups.c
index 52b13fc9af88..aaaadd7d3946 100644
--- a/gdb/reggroups.c
+++ b/gdb/reggroups.c
@@ -321,8 +321,9 @@ struct reggroup *const all_reggroup = &all_group;
 struct reggroup *const save_reggroup = &save_group;
 struct reggroup *const restore_reggroup = &restore_group;
 
+void _initialize_reggroup ();
 void
-_initialize_reggroup (void)
+_initialize_reggroup ()
 {
   reggroups_data = gdbarch_data_register_pre_init (reggroups_init);
 
diff --git a/gdb/remote-notif.c b/gdb/remote-notif.c
index b6e70a434806..cc0011f958cf 100644
--- a/gdb/remote-notif.c
+++ b/gdb/remote-notif.c
@@ -237,8 +237,9 @@ remote_notif_state::~remote_notif_state ()
     delete pending_event[i];
 }
 
+void _initialize_notif ();
 void
-_initialize_notif (void)
+_initialize_notif ()
 {
   add_setshow_boolean_cmd ("notification", no_class, &notif_debug,
 			   _("\
diff --git a/gdb/remote-sim.c b/gdb/remote-sim.c
index 582d206d60c7..6f78350a02c9 100644
--- a/gdb/remote-sim.c
+++ b/gdb/remote-sim.c
@@ -1294,8 +1294,9 @@ gdbsim_target::has_memory ()
   return true;
 }
 
+void _initialize_remote_sim ();
 void
-_initialize_remote_sim (void)
+_initialize_remote_sim ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/remote.c b/gdb/remote.c
index 665e2773e15b..03a00db0e8ce 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -14312,8 +14312,9 @@ set_range_stepping (const char *ignore_args, int from_tty,
     }
 }
 
+void _initialize_remote ();
 void
-_initialize_remote (void)
+_initialize_remote ()
 {
   struct cmd_list_element *cmd;
   const char *cmd_name;
diff --git a/gdb/reverse.c b/gdb/reverse.c
index fbffa5227dfa..1ccb9d279719 100644
--- a/gdb/reverse.c
+++ b/gdb/reverse.c
@@ -322,8 +322,9 @@ info_bookmarks_command (const char *args, int from_tty)
     }
 }
 
+void _initialize_reverse ();
 void
-_initialize_reverse (void)
+_initialize_reverse ()
 {
   add_com ("reverse-step", class_run, reverse_step, _("\
 Step program backward until it reaches the beginning of another source line.\n\
diff --git a/gdb/riscv-fbsd-nat.c b/gdb/riscv-fbsd-nat.c
index ca30506c12f7..27a093552f29 100644
--- a/gdb/riscv-fbsd-nat.c
+++ b/gdb/riscv-fbsd-nat.c
@@ -128,8 +128,9 @@ riscv_fbsd_nat_target::store_registers (struct regcache *regcache,
     }
 }
 
+void _initialize_riscv_fbsd_nat ();
 void
-_initialize_riscv_fbsd_nat (void)
+_initialize_riscv_fbsd_nat ()
 {
   add_inf_child_target (&the_riscv_fbsd_nat_target);
 }
diff --git a/gdb/riscv-fbsd-tdep.c b/gdb/riscv-fbsd-tdep.c
index 157907373c4e..8a9295904de7 100644
--- a/gdb/riscv-fbsd-tdep.c
+++ b/gdb/riscv-fbsd-tdep.c
@@ -225,8 +225,9 @@ riscv_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 					riscv_fbsd_get_thread_local_address);
 }
 
+void _initialize_riscv_fbsd_tdep ();
 void
-_initialize_riscv_fbsd_tdep (void)
+_initialize_riscv_fbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_riscv, 0, GDB_OSABI_FREEBSD,
 			  riscv_fbsd_init_abi);
diff --git a/gdb/riscv-linux-nat.c b/gdb/riscv-linux-nat.c
index 2f95cb3951ad..7a96b7b0743a 100644
--- a/gdb/riscv-linux-nat.c
+++ b/gdb/riscv-linux-nat.c
@@ -310,8 +310,9 @@ riscv_linux_nat_target::store_registers (struct regcache *regcache, int regnum)
 
 /* Initialize RISC-V Linux native support.  */
 
+void _initialize_riscv_linux_nat ();
 void
-_initialize_riscv_linux_nat (void)
+_initialize_riscv_linux_nat ()
 {
   /* Register the target.  */
   linux_target = &the_riscv_linux_nat_target;
diff --git a/gdb/riscv-linux-tdep.c b/gdb/riscv-linux-tdep.c
index 919c7e56e4f8..12c0eef223cb 100644
--- a/gdb/riscv-linux-tdep.c
+++ b/gdb/riscv-linux-tdep.c
@@ -186,8 +186,9 @@ riscv_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
 /* Initialize RISC-V Linux target support.  */
 
+void _initialize_riscv_linux_tdep ();
 void
-_initialize_riscv_linux_tdep (void)
+_initialize_riscv_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_riscv, 0, GDB_OSABI_LINUX,
 			  riscv_linux_init_abi);
diff --git a/gdb/riscv-tdep.c b/gdb/riscv-tdep.c
index 9b06f7c08d35..d585b0be5ab0 100644
--- a/gdb/riscv-tdep.c
+++ b/gdb/riscv-tdep.c
@@ -3511,8 +3511,9 @@ riscv_init_reggroups ()
   csr_reggroup = reggroup_new ("csr", USER_REGGROUP);
 }
 
+void _initialize_riscv_tdep ();
 void
-_initialize_riscv_tdep (void)
+_initialize_riscv_tdep ()
 {
   riscv_create_csr_aliases ();
   riscv_init_reggroups ();
diff --git a/gdb/rl78-tdep.c b/gdb/rl78-tdep.c
index f34f4c6d7f61..3705efdbe89a 100644
--- a/gdb/rl78-tdep.c
+++ b/gdb/rl78-tdep.c
@@ -1480,8 +1480,9 @@ rl78_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
 /* Register the above initialization routine.  */
 
+void _initialize_rl78_tdep ();
 void
-_initialize_rl78_tdep (void)
+_initialize_rl78_tdep ()
 {
   register_gdbarch_init (bfd_arch_rl78, rl78_gdbarch_init);
 }
diff --git a/gdb/rs6000-aix-tdep.c b/gdb/rs6000-aix-tdep.c
index 45fd7c4e7e9c..b5add6409954 100644
--- a/gdb/rs6000-aix-tdep.c
+++ b/gdb/rs6000-aix-tdep.c
@@ -1177,8 +1177,9 @@ rs6000_aix_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
   frame_unwind_append_unwinder (gdbarch, &aix_sighandle_frame_unwind);
 }
 
+void _initialize_rs6000_aix_tdep ();
 void
-_initialize_rs6000_aix_tdep (void)
+_initialize_rs6000_aix_tdep ()
 {
   gdbarch_register_osabi_sniffer (bfd_arch_rs6000,
                                   bfd_target_xcoff_flavour,
diff --git a/gdb/rs6000-lynx178-tdep.c b/gdb/rs6000-lynx178-tdep.c
index bf5d9d859d22..0a20a1783cd5 100644
--- a/gdb/rs6000-lynx178-tdep.c
+++ b/gdb/rs6000-lynx178-tdep.c
@@ -406,8 +406,9 @@ rs6000_lynx178_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT);
 }
 
+void _initialize_rs6000_lynx178_tdep ();
 void
-_initialize_rs6000_lynx178_tdep (void)
+_initialize_rs6000_lynx178_tdep ()
 {
   gdbarch_register_osabi_sniffer (bfd_arch_rs6000,
                                   bfd_target_xcoff_flavour,
diff --git a/gdb/rs6000-nat.c b/gdb/rs6000-nat.c
index 7c916090165b..654e06e3e4bf 100644
--- a/gdb/rs6000-nat.c
+++ b/gdb/rs6000-nat.c
@@ -668,8 +668,9 @@ rs6000_nat_target::xfer_shared_libraries
     }
 }
 
+void _initialize_rs6000_nat ();
 void
-_initialize_rs6000_nat (void)
+_initialize_rs6000_nat ()
 {
   add_inf_child_target (&the_rs6000_nat_target);
 }
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index f61009941da2..ccffc39508a6 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -7307,8 +7307,9 @@ ppc_insn_ds_field (unsigned int insn)
 
 /* Initialization code.  */
 
+void _initialize_rs6000_tdep ();
 void
-_initialize_rs6000_tdep (void)
+_initialize_rs6000_tdep ()
 {
   gdbarch_register (bfd_arch_rs6000, rs6000_gdbarch_init, rs6000_dump_tdep);
   gdbarch_register (bfd_arch_powerpc, rs6000_gdbarch_init, rs6000_dump_tdep);
diff --git a/gdb/run-on-main-thread.c b/gdb/run-on-main-thread.c
index 0676d9d6005e..74ab1e19a57a 100644
--- a/gdb/run-on-main-thread.c
+++ b/gdb/run-on-main-thread.c
@@ -89,6 +89,7 @@ run_on_main_thread (std::function<void ()> &&func)
   serial_event_set (runnable_event);
 }
 
+void _initialize_run_on_main_thread ();
 void
 _initialize_run_on_main_thread ()
 {
diff --git a/gdb/rust-exp.y b/gdb/rust-exp.y
index 3ab9e26246c2..de4a8161635d 100644
--- a/gdb/rust-exp.y
+++ b/gdb/rust-exp.y
@@ -2826,8 +2826,9 @@ rust_lex_tests (void)
 
 #endif /* GDB_SELF_TEST */
 
+void _initialize_rust_exp ();
 void
-_initialize_rust_exp (void)
+_initialize_rust_exp ()
 {
   int code = regcomp (&number_regex, number_regex_text, REG_EXTENDED);
   /* If the regular expression was incorrect, it was a programming
diff --git a/gdb/rx-tdep.c b/gdb/rx-tdep.c
index f282fa32a430..766eaa06ed3e 100644
--- a/gdb/rx-tdep.c
+++ b/gdb/rx-tdep.c
@@ -1057,8 +1057,9 @@ rx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
 /* Register the above initialization routine.  */
 
+void _initialize_rx_tdep ();
 void
-_initialize_rx_tdep (void)
+_initialize_rx_tdep ()
 {
   register_gdbarch_init (bfd_arch_rx, rx_gdbarch_init);
   initialize_tdesc_rx ();
diff --git a/gdb/s12z-tdep.c b/gdb/s12z-tdep.c
index 8fa050589785..922268d1ef21 100644
--- a/gdb/s12z-tdep.c
+++ b/gdb/s12z-tdep.c
@@ -685,8 +685,9 @@ s12z_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_s12z_tdep ();
 void
-_initialize_s12z_tdep (void)
+_initialize_s12z_tdep ()
 {
   gdbarch_register (bfd_arch_s12z, s12z_gdbarch_init, NULL);
 }
diff --git a/gdb/s390-linux-nat.c b/gdb/s390-linux-nat.c
index d1634bd3a6ae..9ec806f5b591 100644
--- a/gdb/s390-linux-nat.c
+++ b/gdb/s390-linux-nat.c
@@ -1045,8 +1045,9 @@ s390_linux_nat_target::read_description ()
 	  tdesc_s390_linux32);
 }
 
+void _initialize_s390_nat ();
 void
-_initialize_s390_nat (void)
+_initialize_s390_nat ()
 {
   /* Register the target.  */
   linux_target = &the_s390_linux_nat_target;
diff --git a/gdb/s390-linux-tdep.c b/gdb/s390-linux-tdep.c
index 65de27731948..e27ce2781f5f 100644
--- a/gdb/s390-linux-tdep.c
+++ b/gdb/s390-linux-tdep.c
@@ -1177,8 +1177,9 @@ s390_linux_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_S390X);
 }
 
+void _initialize_s390_linux_tdep ();
 void
-_initialize_s390_linux_tdep (void)
+_initialize_s390_linux_tdep ()
 {
   /* Hook us into the OSABI mechanism.  */
   gdbarch_register_osabi (bfd_arch_s390, bfd_mach_s390_31, GDB_OSABI_LINUX,
diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c
index b08f331b0a1d..e01505549e67 100644
--- a/gdb/s390-tdep.c
+++ b/gdb/s390-tdep.c
@@ -7215,8 +7215,9 @@ s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_s390_tdep ();
 void
-_initialize_s390_tdep (void)
+_initialize_s390_tdep ()
 {
   /* Hook us into the gdbarch mechanism.  */
   register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
diff --git a/gdb/score-tdep.c b/gdb/score-tdep.c
index 0ec0e35943a0..14eeee9eb8c1 100644
--- a/gdb/score-tdep.c
+++ b/gdb/score-tdep.c
@@ -1510,8 +1510,9 @@ score_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_score_tdep ();
 void
-_initialize_score_tdep (void)
+_initialize_score_tdep ()
 {
   gdbarch_register (bfd_arch_score, score_gdbarch_init, NULL);
 }
diff --git a/gdb/ser-go32.c b/gdb/ser-go32.c
index a1a8f29c7124..9a5b6dcd0e45 100644
--- a/gdb/ser-go32.c
+++ b/gdb/ser-go32.c
@@ -915,8 +915,9 @@ info_serial_command (const char *arg, int from_tty)
 #endif
 }
 
+void _initialize_ser_dos ();
 void
-_initialize_ser_dos (void)
+_initialize_ser_dos ()
 {
   serial_add_interface (&dos_ops);
 
diff --git a/gdb/ser-mingw.c b/gdb/ser-mingw.c
index e6363a1053d9..d204e861a7a8 100644
--- a/gdb/ser-mingw.c
+++ b/gdb/ser-mingw.c
@@ -1338,8 +1338,9 @@ static const struct serial_ops tcp_ops =
   net_windows_done_wait_handle
 };
 
+void _initialize_ser_windows ();
 void
-_initialize_ser_windows (void)
+_initialize_ser_windows ()
 {
   WSADATA wsa_data;
 
diff --git a/gdb/ser-pipe.c b/gdb/ser-pipe.c
index bdc6b054c5d0..db4c8e0e1a4c 100644
--- a/gdb/ser-pipe.c
+++ b/gdb/ser-pipe.c
@@ -228,8 +228,9 @@ static const struct serial_ops pipe_ops =
   ser_unix_write_prim
 };
 
+void _initialize_ser_pipe ();
 void
-_initialize_ser_pipe (void)
+_initialize_ser_pipe ()
 {
   serial_add_interface (&pipe_ops);
 }
diff --git a/gdb/ser-tcp.c b/gdb/ser-tcp.c
index cecdfb2626bb..c5581744f996 100644
--- a/gdb/ser-tcp.c
+++ b/gdb/ser-tcp.c
@@ -469,8 +469,9 @@ static const struct serial_ops tcp_ops =
 
 #endif /* USE_WIN32API */
 
+void _initialize_ser_tcp ();
 void
-_initialize_ser_tcp (void)
+_initialize_ser_tcp ()
 {
 #ifdef USE_WIN32API
   /* Do nothing; the TCP serial operations will be initialized in
diff --git a/gdb/ser-uds.c b/gdb/ser-uds.c
index 7d216de13d50..eb4fe2cb44e3 100644
--- a/gdb/ser-uds.c
+++ b/gdb/ser-uds.c
@@ -111,8 +111,9 @@ static const struct serial_ops uds_ops =
   uds_write_prim
 };
 
+void _initialize_ser_socket ();
 void
-_initialize_ser_socket (void)
+_initialize_ser_socket ()
 {
   serial_add_interface (&uds_ops);
 }
diff --git a/gdb/ser-unix.c b/gdb/ser-unix.c
index df6bc4c7c4ce..8000e352a09b 100644
--- a/gdb/ser-unix.c
+++ b/gdb/ser-unix.c
@@ -498,8 +498,9 @@ static const struct serial_ops hardwire_ops =
   ser_unix_write_prim
 };
 
+void _initialize_ser_hardwire ();
 void
-_initialize_ser_hardwire (void)
+_initialize_ser_hardwire ()
 {
   serial_add_interface (&hardwire_ops);
 
diff --git a/gdb/serial.c b/gdb/serial.c
index a1c3b91c7c2f..e0d64dd627f1 100644
--- a/gdb/serial.c
+++ b/gdb/serial.c
@@ -676,8 +676,9 @@ set_parity (const char *ignore_args, int from_tty, struct cmd_list_element *c)
     serial_parity = GDBPARITY_NONE;
 }
 
+void _initialize_serial ();
 void
-_initialize_serial (void)
+_initialize_serial ()
 {
 #if 0
   add_com ("connect", class_obscure, connect_command, _("\
diff --git a/gdb/sh-linux-tdep.c b/gdb/sh-linux-tdep.c
index 13c10eeeda65..5d2f38f5801e 100644
--- a/gdb/sh-linux-tdep.c
+++ b/gdb/sh-linux-tdep.c
@@ -208,8 +208,9 @@ sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame);
 }
 
+void _initialize_sh_linux_tdep ();
 void
-_initialize_sh_linux_tdep (void)
+_initialize_sh_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_LINUX, sh_linux_init_abi);
 }
diff --git a/gdb/sh-nbsd-nat.c b/gdb/sh-nbsd-nat.c
index 873bdba00281..47cae00d4f53 100644
--- a/gdb/sh-nbsd-nat.c
+++ b/gdb/sh-nbsd-nat.c
@@ -96,8 +96,9 @@ sh_nbsd_nat_target::store_registers (struct regcache *regcache, int regno)
     }
 }
 
+void _initialize_shnbsd_nat ();
 void
-_initialize_shnbsd_nat (void)
+_initialize_shnbsd_nat ()
 {
   add_inf_child_target (&the_sh_nbsd_nat_target);
 }
diff --git a/gdb/sh-nbsd-tdep.c b/gdb/sh-nbsd-tdep.c
index bdf5e4f61308..aa319261684a 100644
--- a/gdb/sh-nbsd-tdep.c
+++ b/gdb/sh-nbsd-tdep.c
@@ -71,8 +71,9 @@ shnbsd_init_abi (struct gdbarch_info info,
     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 }
 
+void _initialize_shnbsd_tdep ();
 void
-_initialize_shnbsd_tdep (void)
+_initialize_shnbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_NETBSD,
 			  shnbsd_init_abi);
diff --git a/gdb/sh-tdep.c b/gdb/sh-tdep.c
index e3aee0ac286b..b69313d050ff 100644
--- a/gdb/sh-tdep.c
+++ b/gdb/sh-tdep.c
@@ -2422,8 +2422,9 @@ set_sh_command (const char *args, int from_tty)
   help_list (setshcmdlist, "set sh ", all_commands, gdb_stdout);
 }
 
+void _initialize_sh_tdep ();
 void
-_initialize_sh_tdep (void)
+_initialize_sh_tdep ()
 {
   gdbarch_register (bfd_arch_sh, sh_gdbarch_init, NULL);
 
diff --git a/gdb/skip.c b/gdb/skip.c
index b27bebaa26a5..05be42ab58d7 100644
--- a/gdb/skip.c
+++ b/gdb/skip.c
@@ -665,8 +665,9 @@ complete_skip_number (cmd_list_element *cmd,
     }
 }
 
+void _initialize_step_skip ();
 void
-_initialize_step_skip (void)
+_initialize_step_skip ()
 {
   static struct cmd_list_element *skiplist = NULL;
   struct cmd_list_element *c;
diff --git a/gdb/sol-thread.c b/gdb/sol-thread.c
index bf2325b6a9e7..333fb961931b 100644
--- a/gdb/sol-thread.c
+++ b/gdb/sol-thread.c
@@ -1190,8 +1190,9 @@ sol_thread_target::get_ada_task_ptid (long lwp, long thread)
   return (thread_info->ptid);
 }
 
+void _initialize_sol_thread ();
 void
-_initialize_sol_thread (void)
+_initialize_sol_thread ()
 {
   void *dlhandle;
 
diff --git a/gdb/solib-aix.c b/gdb/solib-aix.c
index f44ea937d947..125c8960c20c 100644
--- a/gdb/solib-aix.c
+++ b/gdb/solib-aix.c
@@ -719,8 +719,9 @@ show_solib_aix_debug (struct ui_file *file, int from_tty,
 /* The target_so_ops for AIX targets.  */
 struct target_so_ops solib_aix_so_ops;
 
+void _initialize_solib_aix ();
 void
-_initialize_solib_aix (void)
+_initialize_solib_aix ()
 {
   solib_aix_so_ops.relocate_section_addresses
     = solib_aix_relocate_section_addresses;
diff --git a/gdb/solib-darwin.c b/gdb/solib-darwin.c
index 1ad781d686bd..03d91d1690a2 100644
--- a/gdb/solib-darwin.c
+++ b/gdb/solib-darwin.c
@@ -669,8 +669,9 @@ darwin_bfd_open (const char *pathname)
 
 struct target_so_ops darwin_so_ops;
 
+void _initialize_darwin_solib ();
 void
-_initialize_darwin_solib (void)
+_initialize_darwin_solib ()
 {
   darwin_so_ops.relocate_section_addresses = darwin_relocate_section_addresses;
   darwin_so_ops.free_so = darwin_free_so;
diff --git a/gdb/solib-dsbt.c b/gdb/solib-dsbt.c
index 52fa0e868aac..2acad96b5d9a 100644
--- a/gdb/solib-dsbt.c
+++ b/gdb/solib-dsbt.c
@@ -1022,8 +1022,9 @@ show_dsbt_debug (struct ui_file *file, int from_tty,
 
 struct target_so_ops dsbt_so_ops;
 
+void _initialize_dsbt_solib ();
 void
-_initialize_dsbt_solib (void)
+_initialize_dsbt_solib ()
 {
   dsbt_so_ops.relocate_section_addresses = dsbt_relocate_section_addresses;
   dsbt_so_ops.free_so = dsbt_free_so;
diff --git a/gdb/solib-frv.c b/gdb/solib-frv.c
index 10476f6250c9..582f2d5ede60 100644
--- a/gdb/solib-frv.c
+++ b/gdb/solib-frv.c
@@ -1142,8 +1142,9 @@ frv_fetch_objfile_link_map (struct objfile *objfile)
 
 struct target_so_ops frv_so_ops;
 
+void _initialize_frv_solib ();
 void
-_initialize_frv_solib (void)
+_initialize_frv_solib ()
 {
   frv_so_ops.relocate_section_addresses = frv_relocate_section_addresses;
   frv_so_ops.free_so = frv_free_so;
diff --git a/gdb/solib-svr4.c b/gdb/solib-svr4.c
index 3122f06939f5..1c769bb4015b 100644
--- a/gdb/solib-svr4.c
+++ b/gdb/solib-svr4.c
@@ -3260,8 +3260,9 @@ svr4_iterate_over_objfiles_in_search_order
     }
 }
 
+void _initialize_svr4_solib ();
 void
-_initialize_svr4_solib (void)
+_initialize_svr4_solib ()
 {
   solib_svr4_data = gdbarch_data_register_pre_init (solib_svr4_init);
 
diff --git a/gdb/solib-target.c b/gdb/solib-target.c
index 625f0990d109..93d95fdda652 100644
--- a/gdb/solib-target.c
+++ b/gdb/solib-target.c
@@ -438,8 +438,9 @@ solib_target_in_dynsym_resolve_code (CORE_ADDR pc)
 
 struct target_so_ops solib_target_so_ops;
 
+void _initialize_solib_target ();
 void
-_initialize_solib_target (void)
+_initialize_solib_target ()
 {
   solib_target_so_ops.relocate_section_addresses
     = solib_target_relocate_section_addresses;
diff --git a/gdb/solib.c b/gdb/solib.c
index 962ce32dcf03..ba388d77e8d0 100644
--- a/gdb/solib.c
+++ b/gdb/solib.c
@@ -1569,8 +1569,9 @@ remove_user_added_objfile (struct objfile *objfile)
     }
 }
 
+void _initialize_solib ();
 void
-_initialize_solib (void)
+_initialize_solib ()
 {
   solib_data = gdbarch_data_register_pre_init (solib_init);
 
diff --git a/gdb/source-cache.c b/gdb/source-cache.c
index 965dc380b14c..d546ae595248 100644
--- a/gdb/source-cache.c
+++ b/gdb/source-cache.c
@@ -329,6 +329,7 @@ static void extract_lines_test ()
 }
 #endif
 
+void _initialize_source_cache ();
 void
 _initialize_source_cache ()
 {
diff --git a/gdb/source.c b/gdb/source.c
index 1bc98d376e55..327e9c1229eb 100644
--- a/gdb/source.c
+++ b/gdb/source.c
@@ -1865,8 +1865,9 @@ source_lines_range::source_lines_range (int startline,
 }
 
 
+void _initialize_source ();
 void
-_initialize_source (void)
+_initialize_source ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/sparc-linux-nat.c b/gdb/sparc-linux-nat.c
index 03e2c6ebba80..1489d0980e1c 100644
--- a/gdb/sparc-linux-nat.c
+++ b/gdb/sparc-linux-nat.c
@@ -66,8 +66,9 @@ fill_fpregset (const struct regcache *regcache,
   sparc32_collect_fpregset (sparc_fpregmap, regcache, regnum, fpregs);
 }
 
+void _initialize_sparc_linux_nat ();
 void
-_initialize_sparc_linux_nat (void)
+_initialize_sparc_linux_nat ()
 {
   sparc_fpregmap = &sparc32_bsd_fpregmap;
 
diff --git a/gdb/sparc-linux-tdep.c b/gdb/sparc-linux-tdep.c
index e1ba8c60b2ea..1c4adb836745 100644
--- a/gdb/sparc-linux-tdep.c
+++ b/gdb/sparc-linux-tdep.c
@@ -465,8 +465,9 @@ sparc32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 				    sparc32_linux_gdb_signal_to_target);
 }
 
+void _initialize_sparc_linux_tdep ();
 void
-_initialize_sparc_linux_tdep (void)
+_initialize_sparc_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_LINUX,
 			  sparc32_linux_init_abi);
diff --git a/gdb/sparc-nat.c b/gdb/sparc-nat.c
index 81d16cecfdc3..dff0f5215657 100644
--- a/gdb/sparc-nat.c
+++ b/gdb/sparc-nat.c
@@ -305,8 +305,9 @@ sparc_xfer_wcookie (enum target_object object,
 }
 
 
+void _initialize_sparc_nat ();
 void
-_initialize_sparc_nat (void)
+_initialize_sparc_nat ()
 {
   /* Default to using SunOS 4 register sets.  */
   if (sparc_gregmap == NULL)
diff --git a/gdb/sparc-nbsd-nat.c b/gdb/sparc-nbsd-nat.c
index cf940f658378..7138d7df7376 100644
--- a/gdb/sparc-nbsd-nat.c
+++ b/gdb/sparc-nbsd-nat.c
@@ -57,8 +57,9 @@ sparc32nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 
 static sparc_target<inf_ptrace_target> the_sparc_nbsd_nat_target;
 
+void _initialize_sparcnbsd_nat ();
 void
-_initialize_sparcnbsd_nat (void)
+_initialize_sparcnbsd_nat ()
 {
   sparc_gregmap = &sparc32nbsd_gregmap;
   sparc_fpregmap = &sparc32_bsd_fpregmap;
diff --git a/gdb/sparc-nbsd-tdep.c b/gdb/sparc-nbsd-tdep.c
index c1574bbdc617..7aba6020d27e 100644
--- a/gdb/sparc-nbsd-tdep.c
+++ b/gdb/sparc-nbsd-tdep.c
@@ -315,8 +315,9 @@ sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 }
 
+void _initialize_sparcnbsd_tdep ();
 void
-_initialize_sparcnbsd_tdep (void)
+_initialize_sparcnbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD,
 			  sparc32nbsd_init_abi);
diff --git a/gdb/sparc-obsd-tdep.c b/gdb/sparc-obsd-tdep.c
index b5392d2aed16..53bdf6c15124 100644
--- a/gdb/sparc-obsd-tdep.c
+++ b/gdb/sparc-obsd-tdep.c
@@ -246,8 +246,9 @@ sparc32obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   bsd_uthread_set_collect_uthread (gdbarch, sparc32obsd_collect_uthread);
 }
 
+void _initialize_sparc32obsd_tdep ();
 void
-_initialize_sparc32obsd_tdep (void)
+_initialize_sparc32obsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_OPENBSD,
 			  sparc32obsd_init_abi);
diff --git a/gdb/sparc-sol2-tdep.c b/gdb/sparc-sol2-tdep.c
index a886449902dd..2df66d512cef 100644
--- a/gdb/sparc-sol2-tdep.c
+++ b/gdb/sparc-sol2-tdep.c
@@ -293,8 +293,9 @@ sparc32_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);
 }
 
+void _initialize_sparc_sol2_tdep ();
 void
-_initialize_sparc_sol2_tdep (void)
+_initialize_sparc_sol2_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sparc, 0,
 			  GDB_OSABI_SOLARIS, sparc32_sol2_init_abi);
diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c
index 16d1c48755d3..e048f872c2a2 100644
--- a/gdb/sparc-tdep.c
+++ b/gdb/sparc-tdep.c
@@ -2258,8 +2258,9 @@ const struct sparc_fpregmap sparc32_bsd_fpregmap =
   32 * 4,			/* %fsr */
 };
 
+void _initialize_sparc_tdep ();
 void
-_initialize_sparc_tdep (void)
+_initialize_sparc_tdep ()
 {
   register_gdbarch_init (bfd_arch_sparc, sparc32_gdbarch_init);
 }
diff --git a/gdb/sparc64-fbsd-nat.c b/gdb/sparc64-fbsd-nat.c
index d7d874836700..a3ca6705b084 100644
--- a/gdb/sparc64-fbsd-nat.c
+++ b/gdb/sparc64-fbsd-nat.c
@@ -62,8 +62,9 @@ sparc64fbsd_kvm_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 /* Add some extra features to the generic SPARC target.  */
 static sparc_target<fbsd_nat_target> the_sparc64_fbsd_nat_target;
 
+void _initialize_sparc64fbsd_nat ();
 void
-_initialize_sparc64fbsd_nat (void)
+_initialize_sparc64fbsd_nat ()
 {
   add_inf_child_target (&the_sparc64_fbsd_nat_target);
 
diff --git a/gdb/sparc64-fbsd-tdep.c b/gdb/sparc64-fbsd-tdep.c
index 873a888a25fd..0b4cbfaa3735 100644
--- a/gdb/sparc64-fbsd-tdep.c
+++ b/gdb/sparc64-fbsd-tdep.c
@@ -242,8 +242,9 @@ sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 }
 
+void _initialize_sparc64fbsd_tdep ();
 void
-_initialize_sparc64fbsd_tdep (void)
+_initialize_sparc64fbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 			  GDB_OSABI_FREEBSD, sparc64fbsd_init_abi);
diff --git a/gdb/sparc64-linux-nat.c b/gdb/sparc64-linux-nat.c
index bb2bc7175e48..b7f27792b8f3 100644
--- a/gdb/sparc64-linux-nat.c
+++ b/gdb/sparc64-linux-nat.c
@@ -88,8 +88,9 @@ fill_fpregset (const struct regcache *regcache,
   sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
 }
 
+void _initialize_sparc64_linux_nat ();
 void
-_initialize_sparc64_linux_nat (void)
+_initialize_sparc64_linux_nat ()
 {
   sparc_fpregmap = &sparc64_bsd_fpregmap;
 
diff --git a/gdb/sparc64-linux-tdep.c b/gdb/sparc64-linux-tdep.c
index 78de22a3bfdd..de6c04790099 100644
--- a/gdb/sparc64-linux-tdep.c
+++ b/gdb/sparc64-linux-tdep.c
@@ -408,8 +408,9 @@ sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 					 sparc64_linux_handle_segmentation_fault);
 }
 
+void _initialize_sparc64_linux_tdep ();
 void
-_initialize_sparc64_linux_tdep (void)
+_initialize_sparc64_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 			  GDB_OSABI_LINUX, sparc64_linux_init_abi);
diff --git a/gdb/sparc64-nat.c b/gdb/sparc64-nat.c
index 50c312f262a0..fa34c8ca04c9 100644
--- a/gdb/sparc64-nat.c
+++ b/gdb/sparc64-nat.c
@@ -69,8 +69,9 @@ sparc64_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum)
   return 0;
 }
 
+void _initialize_sparc64_nat ();
 void
-_initialize_sparc64_nat (void)
+_initialize_sparc64_nat ()
 {
   sparc_supply_gregset = sparc64_supply_gregset;
   sparc_collect_gregset = sparc64_collect_gregset;
diff --git a/gdb/sparc64-nbsd-nat.c b/gdb/sparc64-nbsd-nat.c
index 65ca2fb1b8e9..5e249b629d16 100644
--- a/gdb/sparc64-nbsd-nat.c
+++ b/gdb/sparc64-nbsd-nat.c
@@ -170,8 +170,9 @@ sparc64nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 /* We've got nothing to add to the generic SPARC target.  */
 static sparc_target<inf_ptrace_target> the_sparc64_nbsd_nat_target;
 
+void _initialize_sparc64nbsd_nat ();
 void
-_initialize_sparc64nbsd_nat (void)
+_initialize_sparc64nbsd_nat ()
 {
   sparc_supply_gregset = sparc64nbsd_supply_gregset;
   sparc_collect_gregset = sparc64nbsd_collect_gregset;
diff --git a/gdb/sparc64-nbsd-tdep.c b/gdb/sparc64-nbsd-tdep.c
index a292bf13c1a0..cd5bfe89410f 100644
--- a/gdb/sparc64-nbsd-tdep.c
+++ b/gdb/sparc64-nbsd-tdep.c
@@ -268,8 +268,9 @@ sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 }
 
+void _initialize_sparc64nbsd_tdep ();
 void
-_initialize_sparc64nbsd_tdep (void)
+_initialize_sparc64nbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 			  GDB_OSABI_NETBSD, sparc64nbsd_init_abi);
diff --git a/gdb/sparc64-obsd-nat.c b/gdb/sparc64-obsd-nat.c
index 6c2a02d6ed7f..502599badec1 100644
--- a/gdb/sparc64-obsd-nat.c
+++ b/gdb/sparc64-obsd-nat.c
@@ -109,8 +109,9 @@ sparc64obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 /* Add some extra features to the generic SPARC target.  */
 static sparc_target<obsd_nat_target> the_sparc64_obsd_nat_target;
 
+void _initialize_sparc64obsd_nat ();
 void
-_initialize_sparc64obsd_nat (void)
+_initialize_sparc64obsd_nat ()
 {
   sparc_supply_gregset = sparc64_supply_gregset;
   sparc_collect_gregset = sparc64_collect_gregset;
diff --git a/gdb/sparc64-obsd-tdep.c b/gdb/sparc64-obsd-tdep.c
index 19715c26a500..fe55124ea022 100644
--- a/gdb/sparc64-obsd-tdep.c
+++ b/gdb/sparc64-obsd-tdep.c
@@ -440,8 +440,9 @@ sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   bsd_uthread_set_collect_uthread (gdbarch, sparc64obsd_collect_uthread);
 }
 
+void _initialize_sparc64obsd_tdep ();
 void
-_initialize_sparc64obsd_tdep (void)
+_initialize_sparc64obsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 			  GDB_OSABI_OPENBSD, sparc64obsd_init_abi);
diff --git a/gdb/sparc64-sol2-tdep.c b/gdb/sparc64-sol2-tdep.c
index a1367423c35f..550fed724fc3 100644
--- a/gdb/sparc64-sol2-tdep.c
+++ b/gdb/sparc64-sol2-tdep.c
@@ -243,8 +243,9 @@ sparc64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);
 }
 
+void _initialize_sparc64_sol2_tdep ();
 void
-_initialize_sparc64_sol2_tdep (void)
+_initialize_sparc64_sol2_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 			  GDB_OSABI_SOLARIS, sparc64_sol2_init_abi);
diff --git a/gdb/sparc64-tdep.c b/gdb/sparc64-tdep.c
index 25de497d9221..a11da6ab2e80 100644
--- a/gdb/sparc64-tdep.c
+++ b/gdb/sparc64-tdep.c
@@ -534,8 +534,9 @@ adi_assign_command (const char *args, int from_tty)
   do_assign (next_address, cnt, version);
 }
 
+void _initialize_sparc64_adi_tdep ();
 void
-_initialize_sparc64_adi_tdep (void)
+_initialize_sparc64_adi_tdep ()
 {
 
   add_prefix_cmd ("adi", class_support, info_adi_command,
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index 736839a0b0ed..a23ebf6b6061 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -4779,8 +4779,9 @@ hashname (const char *name)
 
 /* Initializer for this module.  */
 
+void _initialize_stabsread ();
 void
-_initialize_stabsread (void)
+_initialize_stabsread ()
 {
   undef_types_allocated = 20;
   undef_types_length = 0;
diff --git a/gdb/stack.c b/gdb/stack.c
index 92784c933968..af30405f29ef 100644
--- a/gdb/stack.c
+++ b/gdb/stack.c
@@ -3339,8 +3339,9 @@ static struct cmd_list_element *select_frame_cmd_list = NULL;
 /* Commands with a prefix of `info frame'.  */
 static struct cmd_list_element *info_frame_cmd_list = NULL;
 
+void _initialize_stack ();
 void
-_initialize_stack (void)
+_initialize_stack ()
 {
   struct cmd_list_element *cmd;
 
diff --git a/gdb/stap-probe.c b/gdb/stap-probe.c
index 50f6d518133a..2d1521225163 100644
--- a/gdb/stap-probe.c
+++ b/gdb/stap-probe.c
@@ -1709,8 +1709,9 @@ info_probes_stap_command (const char *arg, int from_tty)
   info_probes_for_spops (arg, from_tty, &stap_static_probe_ops);
 }
 
+void _initialize_stap_probe ();
 void
-_initialize_stap_probe (void)
+_initialize_stap_probe ()
 {
   all_static_probe_ops.push_back (&stap_static_probe_ops);
 
diff --git a/gdb/std-regs.c b/gdb/std-regs.c
index b9c906b9c3f4..c4220733a819 100644
--- a/gdb/std-regs.c
+++ b/gdb/std-regs.c
@@ -91,8 +91,9 @@ value_of_builtin_frame_ps_reg (struct frame_info *frame, const void *baton)
   error (_("Standard register ``$ps'' is not available for this target"));
 }
 
+void _initialize_frame_reg ();
 void
-_initialize_frame_reg (void)
+_initialize_frame_reg ()
 {
   /* Frame based $fp, $pc, $sp and $ps.  These only come into play
      when the target does not define its own version of these
diff --git a/gdb/symfile-debug.c b/gdb/symfile-debug.c
index f233b963062f..53a77a5405dc 100644
--- a/gdb/symfile-debug.c
+++ b/gdb/symfile-debug.c
@@ -645,8 +645,9 @@ show_debug_symfile (struct ui_file *file, int from_tty,
   fprintf_filtered (file, _("Symfile debugging is %s.\n"), value);
 }
 
+void _initialize_symfile_debug ();
 void
-_initialize_symfile_debug (void)
+_initialize_symfile_debug ()
 {
   add_setshow_boolean_cmd ("symfile", no_class, &debug_symfile, _("\
 Set debugging of the symfile functions."), _("\
diff --git a/gdb/symfile-mem.c b/gdb/symfile-mem.c
index 6dcd6555eda9..a62d0d0c8f47 100644
--- a/gdb/symfile-mem.c
+++ b/gdb/symfile-mem.c
@@ -203,8 +203,9 @@ add_vsyscall_page (struct target_ops *target, int from_tty)
     }
 }
 
+void _initialize_symfile_mem ();
 void
-_initialize_symfile_mem (void)
+_initialize_symfile_mem ()
 {
   add_cmd ("add-symbol-file-from-memory", class_files,
            add_symbol_file_from_memory_command,
diff --git a/gdb/symfile.c b/gdb/symfile.c
index d5a797a32cba..f7bada75f350 100644
--- a/gdb/symfile.c
+++ b/gdb/symfile.c
@@ -3864,8 +3864,9 @@ test_set_ext_lang_command ()
 
 #endif /* GDB_SELF_TEST */
 
+void _initialize_symfile ();
 void
-_initialize_symfile (void)
+_initialize_symfile ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/symmisc.c b/gdb/symmisc.c
index a5b17ffa3810..393a0343b90b 100644
--- a/gdb/symmisc.c
+++ b/gdb/symmisc.c
@@ -1040,8 +1040,9 @@ maintenance_info_line_tables (const char *regexp, int from_tty)
 
 /* Do early runtime initializations.  */
 
+void _initialize_symmisc ();
 void
-_initialize_symmisc (void)
+_initialize_symmisc ()
 {
   std_in = stdin;
   std_out = stdout;
diff --git a/gdb/symtab.c b/gdb/symtab.c
index cdd9f2e4c12c..d5ba249ced60 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -6689,8 +6689,9 @@ info_module_var_func_command_completer (struct cmd_list_element *ignore,
 
 
 
+void _initialize_symtab ();
 void
-_initialize_symtab (void)
+_initialize_symtab ()
 {
   cmd_list_element *c;
 
diff --git a/gdb/target-dcache.c b/gdb/target-dcache.c
index 9bdc3df79880..0226d6727808 100644
--- a/gdb/target-dcache.c
+++ b/gdb/target-dcache.c
@@ -152,8 +152,9 @@ code_cache_enabled_p (void)
   return code_cache_enabled;
 }
 
+void _initialize_target_dcache ();
 void
-_initialize_target_dcache (void)
+_initialize_target_dcache ()
 {
   add_setshow_boolean_cmd ("stack-cache", class_support,
 			   &stack_cache_enabled_1, _("\
diff --git a/gdb/target-descriptions.c b/gdb/target-descriptions.c
index 46b123cd5921..04711ba2fa52 100644
--- a/gdb/target-descriptions.c
+++ b/gdb/target-descriptions.c
@@ -1824,8 +1824,9 @@ maintenance_check_xml_descriptions (const char *dir, int from_tty)
 		   (long) selftests::xml_tdesc.size (), failed);
 }
 
+void _initialize_target_descriptions ();
 void
-_initialize_target_descriptions (void)
+_initialize_target_descriptions ()
 {
   tdesc_data = gdbarch_data_register_pre_init (tdesc_data_init);
 
diff --git a/gdb/thread.c b/gdb/thread.c
index 03fdc05140c1..001fdd42c5e9 100644
--- a/gdb/thread.c
+++ b/gdb/thread.c
@@ -2189,8 +2189,9 @@ static const struct internalvar_funcs gthread_funcs =
   NULL
 };
 
+void _initialize_thread ();
 void
-_initialize_thread (void)
+_initialize_thread ()
 {
   static struct cmd_list_element *thread_apply_list = NULL;
   cmd_list_element *c;
diff --git a/gdb/tic6x-linux-tdep.c b/gdb/tic6x-linux-tdep.c
index 2dfd40df3265..1b626b5a174d 100644
--- a/gdb/tic6x-linux-tdep.c
+++ b/gdb/tic6x-linux-tdep.c
@@ -204,8 +204,9 @@ tic6x_uclinux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 				&tic6x_linux_rt_sigreturn_tramp_frame);
 }
 
+void _initialize_tic6x_linux_tdep ();
 void
-_initialize_tic6x_linux_tdep (void)
+_initialize_tic6x_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_tic6x, 0, GDB_OSABI_LINUX,
 			  tic6x_uclinux_init_abi);
diff --git a/gdb/tic6x-tdep.c b/gdb/tic6x-tdep.c
index 35a85129fda3..a05675c570cc 100644
--- a/gdb/tic6x-tdep.c
+++ b/gdb/tic6x-tdep.c
@@ -1301,8 +1301,9 @@ tic6x_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_tic6x_tdep ();
 void
-_initialize_tic6x_tdep (void)
+_initialize_tic6x_tdep ()
 {
   register_gdbarch_init (bfd_arch_tic6x, tic6x_gdbarch_init);
 }
diff --git a/gdb/tilegx-linux-nat.c b/gdb/tilegx-linux-nat.c
index ac40baf4482c..219693b966fd 100644
--- a/gdb/tilegx-linux-nat.c
+++ b/gdb/tilegx-linux-nat.c
@@ -164,8 +164,9 @@ tilegx_linux_nat_target::store_registers (struct regcache *regcache,
     perror_with_name (_("Couldn't write registers"));
 }
 
+void _initialize_tile_linux_nat ();
 void
-_initialize_tile_linux_nat (void)
+_initialize_tile_linux_nat ()
 {
   linux_target = &the_tilegx_linux_nat_target;
   add_inf_child_target (&the_tilegx_linux_nat_target);
diff --git a/gdb/tilegx-linux-tdep.c b/gdb/tilegx-linux-tdep.c
index db82bc78f52a..e656187849cb 100644
--- a/gdb/tilegx-linux-tdep.c
+++ b/gdb/tilegx-linux-tdep.c
@@ -135,8 +135,9 @@ tilegx_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
 }
 
+void _initialize_tilegx_linux_tdep ();
 void
-_initialize_tilegx_linux_tdep (void)
+_initialize_tilegx_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_tilegx, bfd_mach_tilegx, GDB_OSABI_LINUX,
 			  tilegx_linux_init_abi);
diff --git a/gdb/tilegx-tdep.c b/gdb/tilegx-tdep.c
index 13dfc2b36b08..9290bc3878b7 100644
--- a/gdb/tilegx-tdep.c
+++ b/gdb/tilegx-tdep.c
@@ -1032,8 +1032,9 @@ tilegx_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_tilegx_tdep ();
 void
-_initialize_tilegx_tdep (void)
+_initialize_tilegx_tdep ()
 {
   register_gdbarch_init (bfd_arch_tilegx, tilegx_gdbarch_init);
 }
diff --git a/gdb/tracectf.c b/gdb/tracectf.c
index 374e9bbcc507..1c7003c2c9a9 100644
--- a/gdb/tracectf.c
+++ b/gdb/tracectf.c
@@ -1721,8 +1721,9 @@ ctf_target::traceframe_info ()
 
 /* module initialization */
 
+void _initialize_ctf ();
 void
-_initialize_ctf (void)
+_initialize_ctf ()
 {
 #if HAVE_LIBBABELTRACE
   add_target (ctf_target_info, ctf_target_open, filename_completer);
diff --git a/gdb/tracefile-tfile.c b/gdb/tracefile-tfile.c
index c1a4a4933724..ea1917747517 100644
--- a/gdb/tracefile-tfile.c
+++ b/gdb/tracefile-tfile.c
@@ -1131,8 +1131,9 @@ tfile_append_tdesc_line (const char *line)
   buffer_grow_str (&trace_tdesc, "\n");
 }
 
+void _initialize_tracefile_tfile ();
 void
-_initialize_tracefile_tfile (void)
+_initialize_tracefile_tfile ()
 {
   add_target (tfile_target_info, tfile_target_open, filename_completer);
 }
diff --git a/gdb/tracefile.c b/gdb/tracefile.c
index df00b56ba9ce..7f1a25a2cc29 100644
--- a/gdb/tracefile.c
+++ b/gdb/tracefile.c
@@ -471,8 +471,9 @@ tracefile_target::get_trace_status (struct trace_status *ts)
   return -1;
 }
 
+void _initialize_tracefile ();
 void
-_initialize_tracefile (void)
+_initialize_tracefile ()
 {
   add_com ("tsave", class_trace, tsave_command, _("\
 Save the trace data to a file.\n\
diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
index a934e56d3b97..aa6bea4a8f4a 100644
--- a/gdb/tracepoint.c
+++ b/gdb/tracepoint.c
@@ -3980,8 +3980,9 @@ static const struct internalvar_funcs sdata_funcs =
 cmd_list_element *while_stepping_cmd_element = nullptr;
 
 /* module initialization */
+void _initialize_tracepoint ();
 void
-_initialize_tracepoint (void)
+_initialize_tracepoint ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/tui/tui-hooks.c b/gdb/tui/tui-hooks.c
index 76a50fc4b2bf..0e45e0e7507f 100644
--- a/gdb/tui/tui-hooks.c
+++ b/gdb/tui/tui-hooks.c
@@ -277,8 +277,9 @@ tui_remove_hooks (void)
   tui_attach_detach_observers (false);
 }
 
+void _initialize_tui_hooks ();
 void
-_initialize_tui_hooks (void)
+_initialize_tui_hooks ()
 {
   /* Install the permanent hooks.  */
   gdb::observers::new_objfile.attach (tui_new_objfile_hook);
diff --git a/gdb/tui/tui-interp.c b/gdb/tui/tui-interp.c
index 808a77dfd10c..978b5022152b 100644
--- a/gdb/tui/tui-interp.c
+++ b/gdb/tui/tui-interp.c
@@ -306,8 +306,9 @@ tui_interp_factory (const char *name)
   return new tui_interp (name);
 }
 
+void _initialize_tui_interp ();
 void
-_initialize_tui_interp (void)
+_initialize_tui_interp ()
 {
   interp_factory_register (INTERP_TUI, tui_interp_factory);
 
diff --git a/gdb/tui/tui-layout.c b/gdb/tui/tui-layout.c
index 3720d3edc3c2..01961f550c26 100644
--- a/gdb/tui/tui-layout.c
+++ b/gdb/tui/tui-layout.c
@@ -790,8 +790,9 @@ initialize_layouts ()
 /* Function to initialize gdb commands, for tui window layout
    manipulation.  */
 
+void _initialize_tui_layout ();
 void
-_initialize_tui_layout (void)
+_initialize_tui_layout ()
 {
   struct cmd_list_element *cmd;
 
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index 50b3e72e5103..80d1a270e637 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -650,8 +650,9 @@ tui_reggroup_completer (struct cmd_list_element *ignore,
     }
 }
 
+void _initialize_tui_regs ();
 void
-_initialize_tui_regs (void)
+_initialize_tui_regs ()
 {
   struct cmd_list_element **tuicmd, *cmd;
 
diff --git a/gdb/tui/tui-stack.c b/gdb/tui/tui-stack.c
index 18e918827703..7758f2f40d59 100644
--- a/gdb/tui/tui-stack.c
+++ b/gdb/tui/tui-stack.c
@@ -370,8 +370,9 @@ tui_update_command (const char *arg, int from_tty)
 /* Function to initialize gdb commands, for tui window stack
    manipulation.  */
 
+void _initialize_tui_stack ();
 void
-_initialize_tui_stack (void)
+_initialize_tui_stack ()
 {
   add_com ("update", class_tui, tui_update_command,
 	   _("Update the source window and locator to "
diff --git a/gdb/tui/tui-win.c b/gdb/tui/tui-win.c
index df9bf43681e9..8b7c39916a3c 100644
--- a/gdb/tui/tui-win.c
+++ b/gdb/tui/tui-win.c
@@ -1012,8 +1012,9 @@ parse_scrolling_args (const char *arg,
 /* Function to initialize gdb commands, for tui window
    manipulation.  */
 
+void _initialize_tui_win ();
 void
-_initialize_tui_win (void)
+_initialize_tui_win ()
 {
   static struct cmd_list_element *tui_setlist;
   static struct cmd_list_element *tui_showlist;
diff --git a/gdb/tui/tui.c b/gdb/tui/tui.c
index 99d30a55a153..be19ef701d7b 100644
--- a/gdb/tui/tui.c
+++ b/gdb/tui/tui.c
@@ -605,8 +605,9 @@ tui_get_command_dimension (unsigned int *width,
   return true;
 }
 
+void _initialize_tui ();
 void
-_initialize_tui (void)
+_initialize_tui ()
 {
   struct cmd_list_element **tuicmd;
 
diff --git a/gdb/typeprint.c b/gdb/typeprint.c
index effc511e5bb6..e58cd5da289c 100644
--- a/gdb/typeprint.c
+++ b/gdb/typeprint.c
@@ -798,8 +798,9 @@ show_print_type_nested_types  (struct ui_file *file, int from_tty,
     }
 }
 
+void _initialize_typeprint ();
 void
-_initialize_typeprint (void)
+_initialize_typeprint ()
 {
   struct cmd_list_element *c;
 
diff --git a/gdb/ui-style.c b/gdb/ui-style.c
index 28024f57b6f4..2d6640bc700c 100644
--- a/gdb/ui-style.c
+++ b/gdb/ui-style.c
@@ -404,6 +404,7 @@ skip_ansi_escape (const char *buf, int *n_read)
   return true;
 }
 
+void _initialize_ui_style ();
 void
 _initialize_ui_style ()
 {
diff --git a/gdb/unittests/array-view-selftests.c b/gdb/unittests/array-view-selftests.c
index c1079bd505bb..b4fc86646ef5 100644
--- a/gdb/unittests/array-view-selftests.c
+++ b/gdb/unittests/array-view-selftests.c
@@ -523,6 +523,7 @@ run_tests ()
 } /* namespace array_view_tests */
 } /* namespace selftests */
 
+void _initialize_array_view_selftests ();
 void
 _initialize_array_view_selftests ()
 {
diff --git a/gdb/unittests/child-path-selftests.c b/gdb/unittests/child-path-selftests.c
index fdd692d736b0..24b918aef08d 100644
--- a/gdb/unittests/child-path-selftests.c
+++ b/gdb/unittests/child-path-selftests.c
@@ -59,6 +59,7 @@ test ()
 }
 }
 
+void _initialize_child_path_selftests ();
 void
 _initialize_child_path_selftests ()
 {
diff --git a/gdb/unittests/cli-utils-selftests.c b/gdb/unittests/cli-utils-selftests.c
index bc308f60b6d1..09c8565ce927 100644
--- a/gdb/unittests/cli-utils-selftests.c
+++ b/gdb/unittests/cli-utils-selftests.c
@@ -110,6 +110,7 @@ test_cli_utils ()
 }
 }
 
+void _initialize_cli_utils_selftests ();
 void
 _initialize_cli_utils_selftests ()
 {
diff --git a/gdb/unittests/common-utils-selftests.c b/gdb/unittests/common-utils-selftests.c
index 8934a3da4121..e24c3fdf0b47 100644
--- a/gdb/unittests/common-utils-selftests.c
+++ b/gdb/unittests/common-utils-selftests.c
@@ -125,6 +125,7 @@ string_vappendf_tests ()
 
 } /* namespace selftests */
 
+void _initialize_common_utils_selftests ();
 void
 _initialize_common_utils_selftests ()
 {
diff --git a/gdb/unittests/copy_bitwise-selftests.c b/gdb/unittests/copy_bitwise-selftests.c
index 80e09e711df6..d9e9132cf095 100644
--- a/gdb/unittests/copy_bitwise-selftests.c
+++ b/gdb/unittests/copy_bitwise-selftests.c
@@ -152,6 +152,7 @@ copy_bitwise_tests (void)
 
 } /* namespace selftests */
 
+void _initialize_copy_bitwise_utils_selftests ();
 void
 _initialize_copy_bitwise_utils_selftests ()
 {
diff --git a/gdb/unittests/environ-selftests.c b/gdb/unittests/environ-selftests.c
index 65a9c66bcee3..55318605a3b8 100644
--- a/gdb/unittests/environ-selftests.c
+++ b/gdb/unittests/environ-selftests.c
@@ -298,6 +298,7 @@ run_tests ()
 } /* namespace gdb_environ */
 } /* namespace selftests */
 
+void _initialize_environ_selftests ();
 void
 _initialize_environ_selftests ()
 {
diff --git a/gdb/unittests/filtered_iterator-selftests.c b/gdb/unittests/filtered_iterator-selftests.c
index 604d3c5d72d4..14060e1d0afb 100644
--- a/gdb/unittests/filtered_iterator-selftests.c
+++ b/gdb/unittests/filtered_iterator-selftests.c
@@ -155,6 +155,7 @@ test_filtered_iterator_eq ()
 
 } /* namespace selftests */
 
+void _initialize_filtered_iterator_selftests ();
 void
 _initialize_filtered_iterator_selftests ()
 {
diff --git a/gdb/unittests/format_pieces-selftests.c b/gdb/unittests/format_pieces-selftests.c
index bc1bc15c9338..80b408aae11f 100644
--- a/gdb/unittests/format_pieces-selftests.c
+++ b/gdb/unittests/format_pieces-selftests.c
@@ -142,6 +142,7 @@ run_tests ()
 } /* namespace format_pieces */
 } /* namespace selftests */
 
+void _initialize_format_pieces_selftests ();
 void
 _initialize_format_pieces_selftests ()
 {
diff --git a/gdb/unittests/function-view-selftests.c b/gdb/unittests/function-view-selftests.c
index fd0f81222fc5..610b53cb4837 100644
--- a/gdb/unittests/function-view-selftests.c
+++ b/gdb/unittests/function-view-selftests.c
@@ -171,6 +171,7 @@ run_tests ()
 } /* namespace function_view */
 } /* namespace selftests */
 
+void _initialize_function_view_selftests ();
 void
 _initialize_function_view_selftests ()
 {
diff --git a/gdb/unittests/help-doc-selftests.c b/gdb/unittests/help-doc-selftests.c
index 77b6d015bb9a..16ffc4f99073 100644
--- a/gdb/unittests/help-doc-selftests.c
+++ b/gdb/unittests/help-doc-selftests.c
@@ -98,6 +98,7 @@ help_doc_invariants_tests ()
 } /* namespace help_doc_tests */
 } /* namespace selftests */
 
+void _initialize_help_doc_selftests ();
 void
 _initialize_help_doc_selftests ()
 {
diff --git a/gdb/unittests/lookup_name_info-selftests.c b/gdb/unittests/lookup_name_info-selftests.c
index d5f26a4b0d33..002fc6979550 100644
--- a/gdb/unittests/lookup_name_info-selftests.c
+++ b/gdb/unittests/lookup_name_info-selftests.c
@@ -103,6 +103,7 @@ run_tests ()
 
 }} // namespace selftests::lookup_name
 
+void _initialize_lookup_name_info_selftests ();
 void
 _initialize_lookup_name_info_selftests ()
 {
diff --git a/gdb/unittests/main-thread-selftests.c b/gdb/unittests/main-thread-selftests.c
index 7f50ab43da5b..c51f34ef41d2 100644
--- a/gdb/unittests/main-thread-selftests.c
+++ b/gdb/unittests/main-thread-selftests.c
@@ -70,6 +70,7 @@ run_tests ()
 }
 }
 
+void _initialize_main_thread_selftests ();
 void
 _initialize_main_thread_selftests ()
 {
diff --git a/gdb/unittests/memory-map-selftests.c b/gdb/unittests/memory-map-selftests.c
index 904a306aabe2..42b5db6974ac 100644
--- a/gdb/unittests/memory-map-selftests.c
+++ b/gdb/unittests/memory-map-selftests.c
@@ -76,6 +76,7 @@ parse_memory_map_tests ()
 
 #endif /* HAVE_LIBEXPAT */
 
+void _initialize_memory_map_selftests ();
 void
 _initialize_memory_map_selftests ()
 {
diff --git a/gdb/unittests/memrange-selftests.c b/gdb/unittests/memrange-selftests.c
index e8b4dece93e1..b0402685d38a 100644
--- a/gdb/unittests/memrange-selftests.c
+++ b/gdb/unittests/memrange-selftests.c
@@ -106,6 +106,7 @@ normalize_mem_ranges_tests ()
 } /* namespace memrange_tests */
 } /* namespace selftests */
 
+void _initialize_memrange_selftests ();
 void
 _initialize_memrange_selftests ()
 {
diff --git a/gdb/unittests/mkdir-recursive-selftests.c b/gdb/unittests/mkdir-recursive-selftests.c
index a0e9341ca325..8647515e0625 100644
--- a/gdb/unittests/mkdir-recursive-selftests.c
+++ b/gdb/unittests/mkdir-recursive-selftests.c
@@ -81,6 +81,7 @@ test ()
 }
 }
 
+void _initialize_mkdir_recursive_selftests ();
 void
 _initialize_mkdir_recursive_selftests ()
 {
diff --git a/gdb/unittests/observable-selftests.c b/gdb/unittests/observable-selftests.c
index 7e3235b6ec0e..b14c3b71112c 100644
--- a/gdb/unittests/observable-selftests.c
+++ b/gdb/unittests/observable-selftests.c
@@ -127,6 +127,7 @@ run_tests ()
 } /* namespace observers */
 } /* namespace selftests */
 
+void _initialize_observer_selftest ();
 void
 _initialize_observer_selftest ()
 {
diff --git a/gdb/unittests/offset-type-selftests.c b/gdb/unittests/offset-type-selftests.c
index 86dac3e1d66c..1e0428bfd4cb 100644
--- a/gdb/unittests/offset-type-selftests.c
+++ b/gdb/unittests/offset-type-selftests.c
@@ -171,6 +171,7 @@ run_tests ()
 } /* namespace offset_type */
 } /* namespace selftests */
 
+void _initialize_offset_type_selftests ();
 void
 _initialize_offset_type_selftests ()
 {
diff --git a/gdb/unittests/optional-selftests.c b/gdb/unittests/optional-selftests.c
index ddaaeef261cf..c1b9e53ac410 100644
--- a/gdb/unittests/optional-selftests.c
+++ b/gdb/unittests/optional-selftests.c
@@ -87,6 +87,7 @@ run_tests ()
 } /* namespace optional */
 } /* namespace selftests */
 
+void _initialize_optional_selftests ();
 void
 _initialize_optional_selftests ()
 {
diff --git a/gdb/unittests/parse-connection-spec-selftests.c b/gdb/unittests/parse-connection-spec-selftests.c
index 3f71ec647954..6c0df356425d 100644
--- a/gdb/unittests/parse-connection-spec-selftests.c
+++ b/gdb/unittests/parse-connection-spec-selftests.c
@@ -239,6 +239,7 @@ run_tests ()
 } /* namespace parse_connection_spec_tests */
 } /* namespace selftests */
 
+void _initialize_parse_connection_spec_selftests ();
 void
 _initialize_parse_connection_spec_selftests ()
 {
diff --git a/gdb/unittests/rsp-low-selftests.c b/gdb/unittests/rsp-low-selftests.c
index 9e75c2374f1b..e848e58143ed 100644
--- a/gdb/unittests/rsp-low-selftests.c
+++ b/gdb/unittests/rsp-low-selftests.c
@@ -61,6 +61,7 @@ static void test_hex2str ()
 } /* namespace rsp_low */
 } /* namespace selftests */
 
+void _initialize_rsp_low_selftests ();
 void
 _initialize_rsp_low_selftests ()
 {
diff --git a/gdb/unittests/scoped_fd-selftests.c b/gdb/unittests/scoped_fd-selftests.c
index 73c1e2de5e34..3f0247642453 100644
--- a/gdb/unittests/scoped_fd-selftests.c
+++ b/gdb/unittests/scoped_fd-selftests.c
@@ -93,6 +93,7 @@ run_tests ()
 } /* namespace scoped_fd */
 } /* namespace selftests */
 
+void _initialize_scoped_fd_selftests ();
 void
 _initialize_scoped_fd_selftests ()
 {
diff --git a/gdb/unittests/scoped_mmap-selftests.c b/gdb/unittests/scoped_mmap-selftests.c
index fffad74536d5..fa963d1b47f3 100644
--- a/gdb/unittests/scoped_mmap-selftests.c
+++ b/gdb/unittests/scoped_mmap-selftests.c
@@ -135,6 +135,7 @@ run_tests ()
 
 #endif /* !defined(HAVE_SYS_MMAN_H) */
 
+void _initialize_scoped_mmap_selftests ();
 void
 _initialize_scoped_mmap_selftests ()
 {
diff --git a/gdb/unittests/scoped_restore-selftests.c b/gdb/unittests/scoped_restore-selftests.c
index b92103545fcf..d989678fbf83 100644
--- a/gdb/unittests/scoped_restore-selftests.c
+++ b/gdb/unittests/scoped_restore-selftests.c
@@ -103,6 +103,7 @@ run_tests ()
 } /* namespace scoped_restore_tests */
 } /* namespace selftests */
 
+void _initialize_scoped_restore_selftests ();
 void
 _initialize_scoped_restore_selftests ()
 {
diff --git a/gdb/unittests/string_view-selftests.c b/gdb/unittests/string_view-selftests.c
index 49fc95b7fb9b..a52419bb28a5 100644
--- a/gdb/unittests/string_view-selftests.c
+++ b/gdb/unittests/string_view-selftests.c
@@ -172,6 +172,7 @@ run_tests ()
 
 #endif /* __cplusplus < 201703L */
 
+void _initialize_string_view_selftests ();
 void
 _initialize_string_view_selftests ()
 {
diff --git a/gdb/unittests/style-selftests.c b/gdb/unittests/style-selftests.c
index 2cf6cf6932d5..eeab40f6bc7d 100644
--- a/gdb/unittests/style-selftests.c
+++ b/gdb/unittests/style-selftests.c
@@ -101,6 +101,7 @@ run_tests ()
 } /* namespace style */
 } /* namespace selftests */
 
+void _initialize_style_selftest ();
 void
 _initialize_style_selftest ()
 {
diff --git a/gdb/unittests/tracepoint-selftests.c b/gdb/unittests/tracepoint-selftests.c
index 62172b6bd2b4..63a4784f66d8 100644
--- a/gdb/unittests/tracepoint-selftests.c
+++ b/gdb/unittests/tracepoint-selftests.c
@@ -61,6 +61,7 @@ test_parse_static_tracepoint_marker_definition ()
 } /* namespace tracepoint_tests */
 } /* namespace selftests */
 
+void _initialize_tracepoint_selftests ();
 void
 _initialize_tracepoint_selftests ()
 {
diff --git a/gdb/unittests/tui-selftests.c b/gdb/unittests/tui-selftests.c
index b2dffaf49302..6144e23f3949 100644
--- a/gdb/unittests/tui-selftests.c
+++ b/gdb/unittests/tui-selftests.c
@@ -46,6 +46,7 @@ run_tests ()
 
 #endif /* TUI */
 
+void _initialize_tui_selftest ();
 void
 _initialize_tui_selftest ()
 {
diff --git a/gdb/unittests/unpack-selftests.c b/gdb/unittests/unpack-selftests.c
index 503412ef8d61..b02a79644bb4 100644
--- a/gdb/unittests/unpack-selftests.c
+++ b/gdb/unittests/unpack-selftests.c
@@ -53,6 +53,7 @@ unpack_field_as_long_tests (struct gdbarch *arch)
 }
 }
 
+void _initialize_unpack_selftests ();
 void
 _initialize_unpack_selftests ()
 {
diff --git a/gdb/unittests/utils-selftests.c b/gdb/unittests/utils-selftests.c
index 2b59266befda..f6ea2b9fac00 100644
--- a/gdb/unittests/utils-selftests.c
+++ b/gdb/unittests/utils-selftests.c
@@ -51,6 +51,7 @@ test_substitute_path_component ()
 }
 }
 
+void _initialize_utils_selftests ();
 void
 _initialize_utils_selftests ()
 {
diff --git a/gdb/unittests/vec-utils-selftests.c b/gdb/unittests/vec-utils-selftests.c
index 027c1216180e..38e817ae7653 100644
--- a/gdb/unittests/vec-utils-selftests.c
+++ b/gdb/unittests/vec-utils-selftests.c
@@ -66,6 +66,7 @@ unordered_remove_tests ()
 } /* namespace vector_utils_tests */
 } /* amespace selftests */
 
+void _initialize_vec_utils_selftests ();
 void
 _initialize_vec_utils_selftests ()
 {
diff --git a/gdb/unittests/xml-utils-selftests.c b/gdb/unittests/xml-utils-selftests.c
index 88e8dfaac874..421b28ef3f61 100644
--- a/gdb/unittests/xml-utils-selftests.c
+++ b/gdb/unittests/xml-utils-selftests.c
@@ -48,6 +48,7 @@ static void test_xml_escape_text_append ()
 }
 }
 
+void _initialize_xml_utils ();
 void
 _initialize_xml_utils ()
 {
diff --git a/gdb/user-regs.c b/gdb/user-regs.c
index 4117067a0f81..a232b1eb0005 100644
--- a/gdb/user-regs.c
+++ b/gdb/user-regs.c
@@ -233,8 +233,9 @@ maintenance_print_user_registers (const char *args, int from_tty)
     fprintf_unfiltered (gdb_stdout, " %-11s %3d\n", reg->name, regnum);
 }
 
+void _initialize_user_regs ();
 void
-_initialize_user_regs (void)
+_initialize_user_regs ()
 {
   user_regs_data = gdbarch_data_register_post_init (user_regs_init);
 
diff --git a/gdb/utils.c b/gdb/utils.c
index 508c114687ea..fe874fb7844d 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -3415,8 +3415,9 @@ copy_bitwise (gdb_byte *dest, ULONGEST dest_offset,
     }
 }
 
+void _initialize_utils ();
 void
-_initialize_utils (void)
+_initialize_utils ()
 {
   add_setshow_uinteger_cmd ("width", class_support, &chars_per_line, _("\
 Set number of characters where GDB should wrap lines of its output."), _("\
diff --git a/gdb/v850-tdep.c b/gdb/v850-tdep.c
index e5625a3f14ef..9b2e9b62e717 100644
--- a/gdb/v850-tdep.c
+++ b/gdb/v850-tdep.c
@@ -1453,8 +1453,9 @@ v850_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return gdbarch;
 }
 
+void _initialize_v850_tdep ();
 void
-_initialize_v850_tdep (void)
+_initialize_v850_tdep ()
 {
   register_gdbarch_init (bfd_arch_v850, v850_gdbarch_init);
   register_gdbarch_init (bfd_arch_v850_rh850, v850_gdbarch_init);
diff --git a/gdb/valops.c b/gdb/valops.c
index 8488576ef810..7fc555a81088 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -3909,8 +3909,9 @@ cast_into_complex (struct type *type, struct value *val)
     error (_("cannot cast non-number to complex"));
 }
 
+void _initialize_valops ();
 void
-_initialize_valops (void)
+_initialize_valops ()
 {
   add_setshow_boolean_cmd ("overload-resolution", class_support,
 			   &overload_resolution, _("\
diff --git a/gdb/valprint.c b/gdb/valprint.c
index f7088d4d4984..f26a87da3bd4 100644
--- a/gdb/valprint.c
+++ b/gdb/valprint.c
@@ -3262,8 +3262,9 @@ make_value_print_options_def_group (value_print_options *opts)
   return {{value_print_option_defs}, opts};
 }
 
+void _initialize_valprint ();
 void
-_initialize_valprint (void)
+_initialize_valprint ()
 {
   cmd_list_element *cmd;
 
diff --git a/gdb/value.c b/gdb/value.c
index 53b51755d1d9..ceaeb835fa7f 100644
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -4127,8 +4127,9 @@ test_insert_into_bit_range_vector ()
 } /* namespace selftests */
 #endif /* GDB_SELF_TEST */
 
+void _initialize_values ();
 void
-_initialize_values (void)
+_initialize_values ()
 {
   add_cmd ("convenience", no_class, show_convenience, _("\
 Debugger convenience (\"$foo\") variables and functions.\n\
diff --git a/gdb/varobj.c b/gdb/varobj.c
index 48d3c3d9c532..8a7b7108f894 100644
--- a/gdb/varobj.c
+++ b/gdb/varobj.c
@@ -2520,8 +2520,9 @@ varobj_invalidate (void)
   all_root_varobjs (varobj_invalidate_iter, NULL);
 }
 
+void _initialize_varobj ();
 void
-_initialize_varobj (void)
+_initialize_varobj ()
 {
   varobj_table = XCNEWVEC (struct vlist *, VAROBJ_TABLE_SIZE);
 
diff --git a/gdb/vax-bsd-nat.c b/gdb/vax-bsd-nat.c
index 0fe8fbc09be0..899f3e3ed9ce 100644
--- a/gdb/vax-bsd-nat.c
+++ b/gdb/vax-bsd-nat.c
@@ -132,8 +132,9 @@ vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
   return 1;
 }
 
+void _initialize_vaxbsd_nat ();
 void
-_initialize_vaxbsd_nat (void)
+_initialize_vaxbsd_nat ()
 {
   add_inf_child_target (&the_vax_bsd_nat_target);
 
diff --git a/gdb/vax-nbsd-tdep.c b/gdb/vax-nbsd-tdep.c
index 26e8251318e3..c2c08cc16036 100644
--- a/gdb/vax-nbsd-tdep.c
+++ b/gdb/vax-nbsd-tdep.c
@@ -34,8 +34,9 @@ vaxnbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 }
 
+void _initialize_vaxnbsd_tdep ();
 void
-_initialize_vaxnbsd_tdep (void)
+_initialize_vaxnbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_vax, 0, GDB_OSABI_NETBSD,
 			  vaxnbsd_elf_init_abi);
diff --git a/gdb/vax-tdep.c b/gdb/vax-tdep.c
index a83decd6bd62..9373dc848d41 100644
--- a/gdb/vax-tdep.c
+++ b/gdb/vax-tdep.c
@@ -507,8 +507,9 @@ vax_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   return (gdbarch);
 }
 
+void _initialize_vax_tdep ();
 void
-_initialize_vax_tdep (void)
+_initialize_vax_tdep ()
 {
   gdbarch_register (bfd_arch_vax, vax_gdbarch_init, NULL);
 }
diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index be5955d379fb..901e64263c63 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -3056,8 +3056,9 @@ windows_nat_target::thread_name (struct thread_info *thr)
 }
 
 
+void _initialize_windows_nat ();
 void
-_initialize_windows_nat (void)
+_initialize_windows_nat ()
 {
   x86_dr_low.set_control = cygwin_set_dr7;
   x86_dr_low.set_addr = cygwin_set_dr;
@@ -3218,8 +3219,9 @@ windows_nat_target::thread_alive (ptid_t ptid)
   return WaitForSingleObject (thread_rec (tid, FALSE)->h, 0) != WAIT_OBJECT_0;
 }
 
+void _initialize_check_for_gdb_ini ();
 void
-_initialize_check_for_gdb_ini (void)
+_initialize_check_for_gdb_ini ()
 {
   char *homedir;
   if (inhibit_gdbinit)
@@ -3315,8 +3317,9 @@ bad_GetConsoleFontSize (HANDLE w, DWORD nFont)
 /* Load any functions which may not be available in ancient versions
    of Windows.  */
 
+void _initialize_loadable ();
 void
-_initialize_loadable (void)
+_initialize_loadable ()
 {
   HMODULE hm = NULL;
 
diff --git a/gdb/windows-tdep.c b/gdb/windows-tdep.c
index b6e5b9ff7c26..12438e87af36 100644
--- a/gdb/windows-tdep.c
+++ b/gdb/windows-tdep.c
@@ -619,8 +619,9 @@ static const struct internalvar_funcs tlb_funcs =
   NULL
 };
 
+void _initialize_windows_tdep ();
 void
-_initialize_windows_tdep (void)
+_initialize_windows_tdep ()
 {
   init_w32_command_list ();
   add_cmd ("thread-information-block", class_info, display_tib,
diff --git a/gdb/x86-bsd-nat.c b/gdb/x86-bsd-nat.c
index 3fc6f6278276..2bb8f8a2347d 100644
--- a/gdb/x86-bsd-nat.c
+++ b/gdb/x86-bsd-nat.c
@@ -122,6 +122,7 @@ x86bsd_dr_get_control (void)
 
 #endif /* PT_GETDBREGS */
 
+void _initialize_x86_bsd_nat ();
 void
 _initialize_x86_bsd_nat ()
 {
diff --git a/gdb/x86-linux-nat.c b/gdb/x86-linux-nat.c
index f07ef8582547..fb2c92c425b3 100644
--- a/gdb/x86-linux-nat.c
+++ b/gdb/x86-linux-nat.c
@@ -310,6 +310,7 @@ x86_linux_get_thread_area (pid_t pid, void *addr, unsigned int *base_addr)
 }
 
 
+void _initialize_x86_linux_nat ();
 void
 _initialize_x86_linux_nat ()
 {
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index d0fa90e49fb6..5c6061077f54 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -3128,8 +3128,9 @@ xcoff_get_n_import_files (bfd *abfd)
   return l_nimpid - 1;
 }
 
+void _initialize_xcoffread ();
 void
-_initialize_xcoffread (void)
+_initialize_xcoffread ()
 {
   add_symtab_fns (bfd_target_xcoff_flavour, &xcoff_sym_fns);
 }
diff --git a/gdb/xml-support.c b/gdb/xml-support.c
index bace5243ec08..c906b69fda0b 100644
--- a/gdb/xml-support.c
+++ b/gdb/xml-support.c
@@ -1008,8 +1008,10 @@ xml_fetch_content_from_file (const char *filename, void *baton)
   return text;
 }
 
+void _initialize_xml_support ();
+void _initialize_xml_support ();
 void
-_initialize_xml_support (void)
+_initialize_xml_support ()
 {
   add_setshow_boolean_cmd ("xml", class_maintenance, &debug_xml,
 			   _("Set XML parser debugging."),
diff --git a/gdb/xstormy16-tdep.c b/gdb/xstormy16-tdep.c
index 988d78e6934f..0206af8bebc5 100644
--- a/gdb/xstormy16-tdep.c
+++ b/gdb/xstormy16-tdep.c
@@ -833,8 +833,9 @@ xstormy16_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
    Initializer function for the Sanyo Xstormy16a module.
    Called by gdb at start-up.  */
 
+void _initialize_xstormy16_tdep ();
 void
-_initialize_xstormy16_tdep (void)
+_initialize_xstormy16_tdep ()
 {
   register_gdbarch_init (bfd_arch_xstormy16, xstormy16_gdbarch_init);
 }
diff --git a/gdb/xtensa-linux-nat.c b/gdb/xtensa-linux-nat.c
index 097d7bd6f968..57ad8a697224 100644
--- a/gdb/xtensa-linux-nat.c
+++ b/gdb/xtensa-linux-nat.c
@@ -328,8 +328,9 @@ ps_get_thread_area (struct ps_prochandle *ph,
   return PS_OK;
 }
 
+void _initialize_xtensa_linux_nat ();
 void
-_initialize_xtensa_linux_nat (void)
+_initialize_xtensa_linux_nat ()
 {
   const xtensa_regtable_t *ptr;
 
diff --git a/gdb/xtensa-linux-tdep.c b/gdb/xtensa-linux-tdep.c
index ab07eedd0e8e..028c8ea034c9 100644
--- a/gdb/xtensa-linux-tdep.c
+++ b/gdb/xtensa-linux-tdep.c
@@ -125,8 +125,9 @@ xtensa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
                                              svr4_fetch_objfile_link_map);
 }
 
+void _initialize_xtensa_linux_tdep ();
 void
-_initialize_xtensa_linux_tdep (void)
+_initialize_xtensa_linux_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_xtensa, bfd_mach_xtensa, GDB_OSABI_LINUX,
 			  xtensa_linux_init_abi);
diff --git a/gdb/xtensa-tdep.c b/gdb/xtensa-tdep.c
index d44c5b52c09f..bbd92d5cf8f0 100644
--- a/gdb/xtensa-tdep.c
+++ b/gdb/xtensa-tdep.c
@@ -3253,8 +3253,9 @@ xtensa_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
   error (_("xtensa_dump_tdep(): not implemented"));
 }
 
+void _initialize_xtensa_tdep ();
 void
-_initialize_xtensa_tdep (void)
+_initialize_xtensa_tdep ()
 {
   gdbarch_register (bfd_arch_xtensa, xtensa_gdbarch_init, xtensa_dump_tdep);
   xtensa_init_reggroups ();
