diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b8f52bf..b58ccde 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,42 @@
 2016-06-04  Tom Tromey  <tom@tromey.com>
 
+	* ada-lang.c (ada_extensions): New array.
+	(ada_language_defn): Use it.
+	* c-lang.c (c_extensions): New array.
+	(c_language_defn): Use it.
+	(cplus_extensions): New array.
+	(cplus_language_defn): Use it.
+	(asm_extensions): New array.
+	(asm_language_defn): Use it.
+	(minimal_language_defn): Update.
+	* d-lang.c (d_extensions): New array.
+	(d_language_defn): Use it.
+	* f-lang.c (f_extensions): New array.
+	(f_language_defn): Use it.
+	* go-lang.c (go_language_defn): Update.
+	* jv-lang.c (java_extensions): New array.
+	(java_language_defn): Use it.
+	* language.c (add_language): Call add_filename_language.
+	(unknown_language_defn, auto_language_defn, local_language_defn):
+	Update.
+	* language.h (struct language_defn) <la_filename_extensions>: New
+	field.
+	* m2-lang.c (m2_language_defn): Update.
+	* objc-lang.c (objc_extensions): New array.
+	(objc_language_defn): Use it.
+	* opencl-lang.c (opencl_language_defn): Update.
+	* p-lang.c (p_extensions): New array.
+	(pascal_language_defn): Use it.
+	* rust-lang.c (rust_extensions): New array.
+	(rust_language_defn): Use it.
+	* symfile.c (add_filename_language): No longer static.  Make "ext"
+	const.
+	(init_filename_language_table): Remove.
+	(_initialize_symfile): Update.
+	* symfile.h (add_filename_language): Declare.
+
+2016-06-04  Tom Tromey  <tom@tromey.com>
+
 	* symfile.c (filename_language_table): Now a VEC.
 	(fl_table_size, fl_table_next): Remove.
 	(add_filename_language): Use VEC_safe_push.
diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 412aa97..e3f236f 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -14045,6 +14045,11 @@ ada_read_var_value (struct symbol *var, const struct block *var_block,
   return default_read_var_value (var, var_block, frame);
 }
 
+static const char *ada_extensions[] =
+{
+  ".adb", ".ads", ".a", ".ada", ".dg", NULL
+};
+
 const struct language_defn ada_language_defn = {
   "ada",                        /* Language name */
   "Ada",
@@ -14054,6 +14059,7 @@ const struct language_defn ada_language_defn = {
                                    that's not quite what this means.  */
   array_row_major,
   macro_expansion_no,
+  ada_extensions,
   &ada_exp_descriptor,
   parse,
   ada_yyerror,
diff --git a/gdb/c-lang.c b/gdb/c-lang.c
index 8192e97..9ccb87f 100644
--- a/gdb/c-lang.c
+++ b/gdb/c-lang.c
@@ -824,6 +824,11 @@ const struct exp_descriptor exp_descriptor_c =
   evaluate_subexp_c
 };
 
+static const char *c_extensions[] =
+{
+  ".c", NULL
+};
+
 const struct language_defn c_language_defn =
 {
   "c",				/* Language name */
@@ -833,6 +838,7 @@ const struct language_defn c_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_c,
+  c_extensions,
   &exp_descriptor_c,
   c_parse,
   c_yyerror,
@@ -951,6 +957,11 @@ cplus_language_arch_info (struct gdbarch *gdbarch,
   lai->bool_type_default = builtin->builtin_bool;
 }
 
+static const char *cplus_extensions[] =
+{
+  ".C", ".cc", ".cp", ".cpp", ".cxx", ".c++", NULL
+};
+
 const struct language_defn cplus_language_defn =
 {
   "c++",			/* Language name */
@@ -960,6 +971,7 @@ const struct language_defn cplus_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_c,
+  cplus_extensions,
   &exp_descriptor_c,
   c_parse,
   c_yyerror,
@@ -996,6 +1008,11 @@ const struct language_defn cplus_language_defn =
   LANG_MAGIC
 };
 
+static const char *asm_extensions[] =
+{
+  ".s", ".sx", ".S", NULL
+};
+
 const struct language_defn asm_language_defn =
 {
   "asm",			/* Language name */
@@ -1005,6 +1022,7 @@ const struct language_defn asm_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_c,
+  asm_extensions,
   &exp_descriptor_c,
   c_parse,
   c_yyerror,
@@ -1055,6 +1073,7 @@ const struct language_defn minimal_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_c,
+  NULL,
   &exp_descriptor_c,
   c_parse,
   c_yyerror,
diff --git a/gdb/d-lang.c b/gdb/d-lang.c
index 0075fea..b25136d 100644
--- a/gdb/d-lang.c
+++ b/gdb/d-lang.c
@@ -190,6 +190,11 @@ d_language_arch_info (struct gdbarch *gdbarch,
   lai->bool_type_default = builtin->builtin_bool;
 }
 
+static const char *d_extensions[] =
+{
+  ".d", NULL
+};
+
 static const struct language_defn d_language_defn =
 {
   "d",
@@ -199,6 +204,7 @@ static const struct language_defn d_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
+  d_extensions,
   &exp_descriptor_c,
   d_parse,
   d_yyerror,
diff --git a/gdb/f-lang.c b/gdb/f-lang.c
index 22c308f..719083b 100644
--- a/gdb/f-lang.c
+++ b/gdb/f-lang.c
@@ -235,6 +235,13 @@ f_make_symbol_completion_list (const char *text, const char *word,
   return default_make_symbol_completion_list_break_on (text, word, ":", code);
 }
 
+static const char *f_extensions[] =
+{
+  ".f", ".F", ".for", ".FOR", ".ftn", ".FTN", ".fpp", ".FPP",
+  ".f90", ".F90", ".f95", ".F95", ".f03", ".F03", ".f08", ".F08",
+  NULL
+};
+
 const struct language_defn f_language_defn =
 {
   "fortran",
@@ -244,6 +251,7 @@ const struct language_defn f_language_defn =
   case_sensitive_off,
   array_column_major,
   macro_expansion_no,
+  f_extensions,
   &exp_descriptor_standard,
   f_parse,			/* parser */
   f_yyerror,			/* parser error function */
diff --git a/gdb/go-lang.c b/gdb/go-lang.c
index 84a366a..15ca78b 100644
--- a/gdb/go-lang.c
+++ b/gdb/go-lang.c
@@ -565,6 +565,7 @@ static const struct language_defn go_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
+  NULL,
   &exp_descriptor_c,
   go_parse,
   go_yyerror,
diff --git a/gdb/jv-lang.c b/gdb/jv-lang.c
index 14aa0e0..797a7f0 100644
--- a/gdb/jv-lang.c
+++ b/gdb/jv-lang.c
@@ -1162,6 +1162,11 @@ const struct exp_descriptor exp_descriptor_java =
   evaluate_subexp_java
 };
 
+static const char *java_extensions[] =
+{
+  ".java", ".class", NULL
+};
+
 const struct language_defn java_language_defn =
 {
   "java",			/* Language name */
@@ -1171,6 +1176,7 @@ const struct language_defn java_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
+  java_extensions,
   &exp_descriptor_java,
   java_parse,
   java_yyerror,
diff --git a/gdb/language.c b/gdb/language.c
index 8469754..02e21ca 100644
--- a/gdb/language.c
+++ b/gdb/language.c
@@ -575,6 +575,16 @@ add_language (const struct language_defn *lang)
     language_names[i] = languages[i]->la_name;
   language_names[i] = NULL;
 
+  /* Add the filename extensions.  */
+  if (lang->la_filename_extensions != NULL)
+    {
+      int i;
+
+      for (i = 0; lang->la_filename_extensions[i] != NULL; ++i)
+	add_filename_language (lang->la_filename_extensions[i],
+			       lang->la_language);
+    }
+
   /* Build the "help set language" docs.  */
   tmp_stream = mem_fileopen ();
 
@@ -815,6 +825,7 @@ const struct language_defn unknown_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
+  NULL,
   &exp_descriptor_standard,
   unk_lang_parser,
   unk_lang_error,
@@ -862,6 +873,7 @@ const struct language_defn auto_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
+  NULL,
   &exp_descriptor_standard,
   unk_lang_parser,
   unk_lang_error,
@@ -907,6 +919,7 @@ const struct language_defn local_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
+  NULL,
   &exp_descriptor_standard,
   unk_lang_parser,
   unk_lang_error,
diff --git a/gdb/language.h b/gdb/language.h
index 49243a9..d57c60e 100644
--- a/gdb/language.h
+++ b/gdb/language.h
@@ -164,6 +164,13 @@ struct language_defn
     /* Style of macro expansion, if any, supported by this language.  */
     enum macro_expansion la_macro_expansion;
 
+    /* A NULL-terminated array of file extensions for this language.
+       The extension must include the ".", like ".c".  If this
+       language doesn't need to provide any filename extensions, this
+       may be NULL.  */
+
+    const char *const *la_filename_extensions;
+
     /* Definitions related to expression printing, prefixifying, and
        dumping.  */
 
diff --git a/gdb/m2-lang.c b/gdb/m2-lang.c
index 917da15..4626bfc 100644
--- a/gdb/m2-lang.c
+++ b/gdb/m2-lang.c
@@ -363,6 +363,7 @@ const struct language_defn m2_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
+  NULL,
   &exp_descriptor_modula2,
   m2_parse,			/* parser */
   m2_yyerror,			/* parser error function */
diff --git a/gdb/objc-lang.c b/gdb/objc-lang.c
index 34f90e8..fe3e082 100644
--- a/gdb/objc-lang.c
+++ b/gdb/objc-lang.c
@@ -350,6 +350,11 @@ static const struct op_print objc_op_print_tab[] =
     {NULL, OP_NULL, PREC_NULL, 0}
 };
 
+static const char *objc_extensions[] =
+{
+  ".m", NULL
+};
+
 const struct language_defn objc_language_defn = {
   "objective-c",		/* Language name */
   "Objective-C",
@@ -358,6 +363,7 @@ const struct language_defn objc_language_defn = {
   case_sensitive_on,
   array_row_major,
   macro_expansion_c,
+  objc_extensions,
   &exp_descriptor_standard,
   c_parse,
   c_yyerror,
diff --git a/gdb/opencl-lang.c b/gdb/opencl-lang.c
index 767d3bc..74651bc 100644
--- a/gdb/opencl-lang.c
+++ b/gdb/opencl-lang.c
@@ -1052,6 +1052,7 @@ const struct language_defn opencl_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_c,
+  NULL,
   &exp_descriptor_opencl,
   c_parse,
   c_yyerror,
diff --git a/gdb/p-lang.c b/gdb/p-lang.c
index 8ff2682..0897be2 100644
--- a/gdb/p-lang.c
+++ b/gdb/p-lang.c
@@ -412,6 +412,11 @@ pascal_language_arch_info (struct gdbarch *gdbarch,
   lai->bool_type_default = builtin->builtin_bool;
 }
 
+static const char *p_extensions[] =
+{
+  ".pas", ".p", ".pp", NULL
+};
+
 const struct language_defn pascal_language_defn =
 {
   "pascal",			/* Language name */
@@ -421,6 +426,7 @@ const struct language_defn pascal_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
+  p_extensions,
   &exp_descriptor_standard,
   pascal_parse,
   pascal_yyerror,
diff --git a/gdb/rust-lang.c b/gdb/rust-lang.c
index 5df99ce..36dab67 100644
--- a/gdb/rust-lang.c
+++ b/gdb/rust-lang.c
@@ -1998,6 +1998,11 @@ static const struct exp_descriptor exp_descriptor_rust =
   rust_evaluate_subexp
 };
 
+static const char *rust_extensions[] =
+{
+  ".rs", NULL
+};
+
 static const struct language_defn rust_language_defn =
 {
   "rust",
@@ -2007,6 +2012,7 @@ static const struct language_defn rust_language_defn =
   case_sensitive_on,
   array_row_major,
   macro_expansion_no,
+  rust_extensions,
   &exp_descriptor_rust,
   rust_parse,
   rustyyerror,
diff --git a/gdb/symfile.c b/gdb/symfile.c
index f7f56c6..d29e96c 100644
--- a/gdb/symfile.c
+++ b/gdb/symfile.c
@@ -114,12 +114,8 @@ static int simple_read_overlay_table (void);
 
 static int simple_overlay_update_1 (struct obj_section *);
 
-static void add_filename_language (char *ext, enum language lang);
-
 static void info_ext_lang_command (char *args, int from_tty);
 
-static void init_filename_language_table (void);
-
 static void symfile_find_segment_sections (struct objfile *objfile);
 
 void _initialize_symfile (void);
@@ -2719,8 +2715,10 @@ DEF_VEC_O (filename_language);
 
 static VEC (filename_language) *filename_language_table;
 
-static void
-add_filename_language (char *ext, enum language lang)
+/* See symfile.h.  */
+
+void
+add_filename_language (const char *ext, enum language lang)
 {
   filename_language entry;
 
@@ -2818,54 +2816,6 @@ info_ext_lang_command (char *args, int from_tty)
     printf_filtered ("\t%s\t- %s\n", entry->ext, language_str (entry->lang));
 }
 
-static void
-init_filename_language_table (void)
-{
-  /* Protect against repetition.  */
-  if (VEC_empty (filename_language, filename_language_table))
-    {
-      add_filename_language (".c", language_c);
-      add_filename_language (".d", language_d);
-      add_filename_language (".C", language_cplus);
-      add_filename_language (".cc", language_cplus);
-      add_filename_language (".cp", language_cplus);
-      add_filename_language (".cpp", language_cplus);
-      add_filename_language (".cxx", language_cplus);
-      add_filename_language (".c++", language_cplus);
-      add_filename_language (".java", language_java);
-      add_filename_language (".class", language_java);
-      add_filename_language (".m", language_objc);
-      add_filename_language (".f", language_fortran);
-      add_filename_language (".F", language_fortran);
-      add_filename_language (".for", language_fortran);
-      add_filename_language (".FOR", language_fortran);
-      add_filename_language (".ftn", language_fortran);
-      add_filename_language (".FTN", language_fortran);
-      add_filename_language (".fpp", language_fortran);
-      add_filename_language (".FPP", language_fortran);
-      add_filename_language (".f90", language_fortran);
-      add_filename_language (".F90", language_fortran);
-      add_filename_language (".f95", language_fortran);
-      add_filename_language (".F95", language_fortran);
-      add_filename_language (".f03", language_fortran);
-      add_filename_language (".F03", language_fortran);
-      add_filename_language (".f08", language_fortran);
-      add_filename_language (".F08", language_fortran);
-      add_filename_language (".s", language_asm);
-      add_filename_language (".sx", language_asm);
-      add_filename_language (".S", language_asm);
-      add_filename_language (".pas", language_pascal);
-      add_filename_language (".p", language_pascal);
-      add_filename_language (".pp", language_pascal);
-      add_filename_language (".adb", language_ada);
-      add_filename_language (".ads", language_ada);
-      add_filename_language (".a", language_ada);
-      add_filename_language (".ada", language_ada);
-      add_filename_language (".dg", language_ada);
-      add_filename_language (".rs", language_rust);
-    }
-}
-
 enum language
 deduce_language_from_filename (const char *filename)
 {
@@ -4018,7 +3968,6 @@ A load OFFSET may also be given."), &cmdlist);
 	   _("Read the overlay mapping state from the target."), &overlaylist);
 
   /* Filename extension to source language lookup table: */
-  init_filename_language_table ();
   add_setshow_string_noescape_cmd ("extension-language", class_files,
 				   &ext_args, _("\
 Set mapping between filename extension and source language."), _("\
diff --git a/gdb/symfile.h b/gdb/symfile.h
index c538e05..a11c48a 100644
--- a/gdb/symfile.h
+++ b/gdb/symfile.h
@@ -440,6 +440,11 @@ extern void clear_symtab_users (int add_flags);
 
 extern enum language deduce_language_from_filename (const char *);
 
+/* Map the filename extension EXT to the language LANG.  Any previous
+   association of EXT will be removed.  EXT will be copied by this
+   function.  */
+extern void add_filename_language (const char *ext, enum language lang);
+
 /* This enum encodes bit-flags passed as ADD_FLAGS parameter to
    symbol_file_add, etc.  */
 
