Support MSYS2 platform

Message ID 20240303110748.1286-1-orgad.shaneh@audiocodes.com
State New
Headers
Series Support MSYS2 platform |

Checks

Context Check Description
linaro-tcwg-bot/tcwg_gdb_build--master-aarch64 success Testing passed
linaro-tcwg-bot/tcwg_gdb_build--master-arm success Testing passed
linaro-tcwg-bot/tcwg_gdb_check--master-arm success Testing passed
linaro-tcwg-bot/tcwg_gdb_check--master-aarch64 success Testing passed

Commit Message

Orgad Shaneh March 3, 2024, 11:07 a.m. UTC
  From: Orgad Shaneh <orgads@gmail.com>

Apply MSYS2 patches upstream.

MSYS2 is similar to (and based on) cygwin, but it supports native paths,
and focuses on building native Windows software.

https://www.msys2.org/docs/what-is-msys2/
---
 ar-lib                                      |  4 +-
 bfd/acinclude.m4                            |  2 +-
 bfd/config.bfd                              |  4 +-
 bfd/configure                               | 36 +++++++-----
 bfd/configure.ac                            |  4 ++
 binutils/NEWS                               |  2 +
 binutils/configure                          | 36 +++++++-----
 binutils/configure.ac                       |  6 +-
 binutils/dllwrap.c                          | 13 ++++-
 binutils/testsuite/binutils-all/dlltool.exp |  1 +
 compile                                     |  4 +-
 config.guess                                |  3 +
 config.rpath                                |  8 +--
 config/dfp.m4                               |  3 +-
 config/elf.m4                               |  2 +-
 config/lthostflags.m4                       |  2 +-
 config/mmap.m4                              |  4 +-
 config/picflag.m4                           |  2 +
 config/tcl.m4                               |  4 +-
 configure                                   | 22 ++++----
 configure.ac                                | 20 +++----
 gas/configure                               | 32 ++++++-----
 gas/configure.tgt                           |  2 +-
 gas/testsuite/gas/all/gas.exp               |  6 +-
 gdb/NEWS                                    |  7 +++
 gdb/configure                               | 53 +++++++++++-------
 gdb/configure.ac                            |  6 +-
 gdb/configure.host                          |  2 +
 gdb/configure.nat                           |  7 ++-
 gdb/configure.tgt                           |  7 ++-
 gdb/testsuite/gdb.base/bigcore.exp          |  3 +-
 gdb/testsuite/gdb.base/fileio.exp           |  2 +-
 gdb/testsuite/gdb.base/maint.exp            |  2 +-
 gdb/testsuite/gdb.base/shreloc.exp          |  4 +-
 gdb/testsuite/gdb.base/solib-weak.exp       |  3 +-
 gdb/testsuite/gdb.dwarf2/dw2-dos-drive.exp  |  3 +-
 gdb/testsuite/gdb.server/wrapper.exp        |  3 +-
 gdb/testsuite/lib/gdb.exp                   | 22 ++++++--
 gdb/windows-nat.c                           |  8 +++
 gdbserver/configure.srv                     |  4 +-
 gnulib/configure                            |  8 +--
 gnulib/import/m4/double-slash-root.m4       |  2 +-
 gnulib/import/m4/dup2.m4                    |  2 +-
 gnulib/import/m4/fcntl.m4                   |  2 +-
 gprof/configure                             | 28 ++++++----
 ld/configure                                | 45 +++++++++------
 ld/configure.tgt                            |  6 +-
 ld/emultempl/pe.em                          |  4 +-
 ld/emultempl/pep.em                         |  2 +-
 ld/pe-dll.c                                 |  9 +++
 ld/testsuite/ld-auto-import/auto-import.exp | 62 +++++++++++++++++++++
 ld/testsuite/ld-fastcall/fastcall.exp       |  1 +
 ld/testsuite/ld-pe/pe-compile.exp           |  1 +
 ld/testsuite/ld-pe/pe.exp                   |  5 +-
 ld/testsuite/ld-pe/weakdef-1.d              |  2 +-
 libctf/configure                            | 32 +++++++----
 libctf/configure.ac                         |  4 ++
 libdecnumber/configure                      |  3 +-
 libiberty/configure                         |  4 +-
 libiberty/configure.ac                      |  2 +-
 libtool.m4                                  | 36 +++++++-----
 ltmain.sh                                   | 52 ++++++++---------
 ltoptions.m4                                |  2 +-
 opcodes/configure                           | 34 +++++++----
 opcodes/configure.ac                        |  4 ++
 readline/readline/configure                 |  2 +-
 readline/readline/configure.ac              |  2 +-
 readline/readline/support/config.guess      |  3 +
 readline/readline/support/config.rpath      | 10 ++--
 readline/readline/support/shlib-install     |  4 +-
 readline/readline/support/shobj-conf        | 18 ++++++
 sim/configure                               | 28 ++++++----
 zlib/configure                              | 28 ++++++----
 73 files changed, 532 insertions(+), 273 deletions(-)
  

Patch

diff --git a/ar-lib b/ar-lib
index 05094d34c69..1b16134da54 100755
--- a/ar-lib
+++ b/ar-lib
@@ -53,7 +53,7 @@  func_file_conv ()
 	  MINGW*)
 	    file_conv=mingw
 	    ;;
-	  CYGWIN*)
+	  CYGWIN*|MSYS*)
 	    file_conv=cygwin
 	    ;;
 	  *)
@@ -65,7 +65,7 @@  func_file_conv ()
 	mingw)
 	  file=`cmd //C echo "$file " | sed -e 's/"\(.*\) " *$/\1/'`
 	  ;;
-	cygwin)
+	cygwin|msys)
 	  file=`cygpath -m "$file" || echo "$file"`
 	  ;;
 	wine)
diff --git a/bfd/acinclude.m4 b/bfd/acinclude.m4
index 0ba7957760d..4ae2c97951f 100644
--- a/bfd/acinclude.m4
+++ b/bfd/acinclude.m4
@@ -21,7 +21,7 @@  AC_DEFUN([BFD_BINARY_FOPEN],
 [AC_REQUIRE([AC_CANONICAL_TARGET])
 case "${host}" in
 changequote(,)dnl
-*-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-windows*)
+*-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-msys* | *-*-windows*)
 changequote([,])dnl
   AC_DEFINE(USE_BINARY_FOPEN, 1, [Use b modifier when opening binary files?]) ;;
 esac])dnl
diff --git a/bfd/config.bfd b/bfd/config.bfd
index 6553aac1e99..6aa7f2b1c07 100644
--- a/bfd/config.bfd
+++ b/bfd/config.bfd
@@ -715,7 +715,7 @@  case "${targ}" in
     targ_selvecs="i386_elf32_vec iamcu_elf32_vec x86_64_elf32_vec i386_pei_vec x86_64_pe_vec x86_64_pei_vec"
     want64=true
     ;;
-  x86_64-*-mingw* | x86_64-*-pe | x86_64-*-pep | x86_64-*-cygwin)
+  x86_64-*-mingw* | x86_64-*-pe | x86_64-*-pep | x86_64-*-cygwin | x86_64-*-msys)
     targ_defvec=x86_64_pe_vec
     targ_selvecs="x86_64_pe_vec x86_64_pei_vec x86_64_pe_big_vec x86_64_elf64_vec i386_pe_vec i386_pei_vec i386_elf32_vec iamcu_elf32_vec pdb_vec"
     want64=true
@@ -774,7 +774,7 @@  case "${targ}" in
     targ_defvec=i386_elf32_vec
     targ_selvecs="iamcu_elf32_vec i386_coff_vec"
     ;;
-  i[3-7]86-*-mingw32* | i[3-7]86-*-cygwin* | i[3-7]86-*-winnt | i[3-7]86-*-pe)
+  i[3-7]86-*-mingw32* | i[3-7]86-*-cygwin* | i[3-7]86-*-msys* | i[3-7]86-*-winnt | i[3-7]86-*-pe)
     targ_defvec=i386_pe_vec
     targ_selvecs="i386_pe_vec i386_pe_big_vec i386_pei_vec i386_elf32_vec iamcu_elf32_vec pdb_vec"
     targ_underscore=yes
diff --git a/bfd/configure b/bfd/configure
index 23ffa6da332..d3667447d0a 100755
--- a/bfd/configure
+++ b/bfd/configure
@@ -5674,7 +5674,7 @@  else
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -6016,7 +6016,7 @@  bsdi[45]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -6632,7 +6632,7 @@  case $host_os in
 aix*)
   symcode='[BCDT]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[ABCDGISTW]'
   ;;
 hpux*)
@@ -8218,7 +8218,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -8300,7 +8300,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       lt_prog_compiler_pic='-DDLL_EXPORT'
@@ -8762,7 +8762,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -8877,7 +8877,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
       # as there is no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -9308,7 +9308,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       export_dynamic_flag_spec=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -10209,14 +10209,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -10238,6 +10238,12 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+      ;;
+    msys*)
+      # Msys DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
       ;;
     mingw* | cegcc*)
@@ -10890,7 +10896,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;
@@ -15179,7 +15185,7 @@  _ACEOF
 
 
 case "${host}" in
-*-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-windows*)
+*-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-msys* | *-*-windows*)
 
 $as_echo "#define USE_BINARY_FOPEN 1" >>confdefs.h
  ;;
@@ -15550,7 +15556,7 @@  $as_echo "$bfd_cv_ld_as_needed" >&6; }
 
 LIBM=
 case $host in
-*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
+*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-msys* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
   # These system don't have libm, or don't need it
   ;;
 *-ncr-sysv4.3*)
@@ -15704,6 +15710,10 @@  if test "$enable_shared" = "yes"; then
     SHARED_LDFLAGS="-no-undefined"
     SHARED_LIBADD="-L`pwd`/../libiberty -liberty $SHARED_LIBADD -lcygwin -lkernel32"
   ;;
+  *-*-msys*)
+    SHARED_LDFLAGS="-no-undefined"
+    SHARED_LIBADD="-L`pwd`/../libiberty -liberty -L`pwd`/../intl -lintl -lmsys-2.0 -lkernel32"
+  ;;
   esac
 
   if test -n "$SHARED_LIBADD"; then
diff --git a/bfd/configure.ac b/bfd/configure.ac
index 7fcc5d4a947..b5dfe025c71 100644
--- a/bfd/configure.ac
+++ b/bfd/configure.ac
@@ -289,6 +289,10 @@  if test "$enable_shared" = "yes"; then
     SHARED_LDFLAGS="-no-undefined"
     SHARED_LIBADD="-L`pwd`/../libiberty -liberty $SHARED_LIBADD -lcygwin -lkernel32"
   ;;
+  *-*-msys*)
+    SHARED_LDFLAGS="-no-undefined"
+    SHARED_LIBADD="-L`pwd`/../libiberty -liberty $SHARED_LIBADD -lmsys-2.0 -lkernel32"
+  ;;
   esac
 
   if test -n "$SHARED_LIBADD"; then
diff --git a/binutils/NEWS b/binutils/NEWS
index 9c7c8f1f603..2cf7b86bb7f 100644
--- a/binutils/NEWS
+++ b/binutils/NEWS
@@ -6,6 +6,8 @@ 
   section they will now also display the contents of the .eh_frame_hdr section,
   if present.
 
+* Added built-in support for building on MSYS2 platform.
+
 Changes in 2.42:
 
 * The objdump program has a new command line option -Z/--decompress which
diff --git a/binutils/configure b/binutils/configure
index 2b9f52720c3..cf2b7face1b 100755
--- a/binutils/configure
+++ b/binutils/configure
@@ -5569,7 +5569,7 @@  else
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -5911,7 +5911,7 @@  bsdi[45]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -6527,7 +6527,7 @@  case $host_os in
 aix*)
   symcode='[BCDT]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[ABCDGISTW]'
   ;;
 hpux*)
@@ -8144,7 +8144,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -8226,7 +8226,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       lt_prog_compiler_pic='-DDLL_EXPORT'
@@ -8688,7 +8688,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -8803,7 +8803,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
       # as there is no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -9234,7 +9234,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       export_dynamic_flag_spec=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -10135,14 +10135,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -10164,6 +10164,12 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+      ;;
+    msys*)
+      # MSYS DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
       ;;
     mingw* | cegcc*)
@@ -10816,7 +10822,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;
@@ -15901,7 +15907,7 @@  fi
 
 
 case "${host}" in
-*-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-windows*)
+*-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-msys* | *-*-windows*)
 
 $as_echo "#define USE_BINARY_FOPEN 1" >>confdefs.h
  ;;
@@ -16454,7 +16460,7 @@  do
 	BUILD_WINDRES='$(WINDRES_PROG)$(EXEEXT)'
 	BUILD_WINDMC='$(WINDMC_PROG)$(EXEEXT)'
 	;;
-    i[3-7]86-*-pe* | i[3-7]86-*-cygwin* | i[3-7]86-*-mingw32** | all)
+    i[3-7]86-*-pe* | i[3-7]86-*-cygwin* |  i[3-7]86-*-msys* | i[3-7]86-*-mingw32** | all)
 	BUILD_DLLTOOL='$(DLLTOOL_PROG)$(EXEEXT)'
 	if test -z "$DLLTOOL_DEFAULT"; then
 	    DLLTOOL_DEFAULT="-DDLLTOOL_DEFAULT_I386"
@@ -16496,7 +16502,7 @@  do
 	BUILD_WINDRES='$(WINDRES_PROG)$(EXEEXT)'
 	BUILD_WINDMC='$(WINDMC_PROG)$(EXEEXT)'
 	;;
-    x86_64-*-mingw* | x86_64-*-cygwin*)
+    x86_64-*-mingw* | x86_64-*-cygwin* | x86_64-*-msys*)
 	BUILD_DLLTOOL='$(DLLTOOL_PROG)$(EXEEXT)'
 	if test -z "$DLLTOOL_DEFAULT"; then
 	    DLLTOOL_DEFAULT="-DDLLTOOL_DEFAULT_MX86_64"
@@ -16520,7 +16526,7 @@  do
     powerpc*-*-aix* | rs6000-*-aix*)
 	od_vectors="$od_vectors objdump_private_desc_xcoff"
 	;;
-    *-*-pe* | *-*-cygwin* | *-*-mingw*)
+    *-*-pe* | *-*-cygwin* | *-*-msys* | *-*-mingw*)
 	 od_vectors="$od_vectors objdump_private_desc_pe"
 	 ;;
     *-*-darwin*)
diff --git a/binutils/configure.ac b/binutils/configure.ac
index dac72c1bdd4..5555efcf789 100644
--- a/binutils/configure.ac
+++ b/binutils/configure.ac
@@ -398,7 +398,7 @@  changequote([,])dnl
 	BUILD_WINDMC='$(WINDMC_PROG)$(EXEEXT)'
 	;;
 changequote(,)dnl
-    i[3-7]86-*-pe* | i[3-7]86-*-cygwin* | i[3-7]86-*-mingw32** | all)
+    i[3-7]86-*-pe* | i[3-7]86-*-cygwin* | i[3-7]86-*-msys* | i[3-7]86-*-mingw32** | all)
 changequote([,])dnl
 	BUILD_DLLTOOL='$(DLLTOOL_PROG)$(EXEEXT)'
 	if test -z "$DLLTOOL_DEFAULT"; then
@@ -443,7 +443,7 @@  changequote([,])dnl
 	BUILD_WINDRES='$(WINDRES_PROG)$(EXEEXT)'
 	BUILD_WINDMC='$(WINDMC_PROG)$(EXEEXT)'
 	;;
-    x86_64-*-mingw* | x86_64-*-cygwin*)
+    x86_64-*-mingw* | x86_64-*-cygwin* | x86_64-*-msys*)
 	BUILD_DLLTOOL='$(DLLTOOL_PROG)$(EXEEXT)'
 	if test -z "$DLLTOOL_DEFAULT"; then
 	    DLLTOOL_DEFAULT="-DDLLTOOL_DEFAULT_MX86_64"
@@ -467,7 +467,7 @@  changequote([,])dnl
     powerpc*-*-aix* | rs6000-*-aix*)
 	od_vectors="$od_vectors objdump_private_desc_xcoff"
 	;;
-    *-*-pe* | *-*-cygwin* | *-*-mingw*)
+    *-*-pe* | *-*-cygwin* | *-*-msys* | *-*-mingw*)
 	 od_vectors="$od_vectors objdump_private_desc_pe"
 	 ;;
     *-*-darwin*)
diff --git a/binutils/dllwrap.c b/binutils/dllwrap.c
index bf119cee5d6..99d9bfb6779 100644
--- a/binutils/dllwrap.c
+++ b/binutils/dllwrap.c
@@ -78,6 +78,7 @@  static int is_leading_underscore = -1;
 typedef enum {
   UNKNOWN_TARGET,
   CYGWIN_TARGET,
+  MSYS_TARGET,
   MINGW_TARGET
 }
 target_type;
@@ -833,6 +834,8 @@  Creating one, but that may not be what you want"));
   /* Set the target platform.  */
   if (strstr (target, "cygwin"))
     which_target = CYGWIN_TARGET;
+  else if (strstr (target, "msys"))
+    which_target = MSYS_TARGET;
   else if (strstr (target, "mingw"))
     which_target = MINGW_TARGET;
   else
@@ -884,6 +887,10 @@  Creating one, but that may not be what you want"));
 	  driver_flags = cygwin_driver_flags;
 	  break;
 
+	case MSYS_TARGET:
+	  driver_flags = cygwin_driver_flags;
+	  break;
+
 	case MINGW_TARGET:
 	  driver_flags = mingw32_driver_flags;
 	  break;
@@ -917,6 +924,10 @@  Creating one, but that may not be what you want"));
 	  name_entry = "_cygwin_dll_entry";
 	  break;
 
+	case MSYS_TARGET:
+	  name_entry = "_msys_dll_entry";
+	  break;
+
 	case MINGW_TARGET:
 	  name_entry = "DllMainCRTStartup";
 	  break;
@@ -980,7 +991,7 @@  Creating one, but that may not be what you want"));
 	{
 	  dyn_string_append_cstr (step_pre1, " --export-all --exclude-symbol=");
 	  dyn_string_append_cstr (step_pre1,
-	  "_cygwin_dll_entry@12,DllMainCRTStartup@12,DllMain@12,DllEntryPoint@12");
+	  "_cygwin_dll_entry@12,_msys_dll_entry@12,DllMainCRTStartup@12,DllMain@12,DllEntryPoint@12");
 	}
       dyn_string_append_cstr (step_pre1, " --output-def ");
       dyn_string_append_cstr (step_pre1, def_file_name);
diff --git a/binutils/testsuite/binutils-all/dlltool.exp b/binutils/testsuite/binutils-all/dlltool.exp
index ac1306bdf77..0a9e61336ff 100644
--- a/binutils/testsuite/binutils-all/dlltool.exp
+++ b/binutils/testsuite/binutils-all/dlltool.exp
@@ -22,6 +22,7 @@  if {![istarget "i*86-*-*"]
 
 if {![istarget "i*86-*-*pe*"] \
     && ![istarget "i*86-*-cygwin*"] \
+    && ![istarget "i*86-*-msys*"] \
     && ![istarget "i*86-*-mingw32*"] \
     && ![istarget "arm-*-pe*"] \
     && ![istarget "x86_64-*-mingw*"] } {
diff --git a/compile b/compile
index a85b723c7e6..a4ecdb2519c 100755
--- a/compile
+++ b/compile
@@ -53,7 +53,7 @@  func_file_conv ()
 	  MINGW*)
 	    file_conv=mingw
 	    ;;
-	  CYGWIN*)
+	  CYGWIN*|MSYS*)
 	    file_conv=cygwin
 	    ;;
 	  *)
@@ -67,7 +67,7 @@  func_file_conv ()
 	mingw/*)
 	  file=`cmd //C echo "$file " | sed -e 's/"\(.*\) " *$/\1/'`
 	  ;;
-	cygwin/*)
+	cygwin/*|msys/*)
 	  file=`cygpath -m "$file" || echo "$file"`
 	  ;;
 	wine/*)
diff --git a/config.guess b/config.guess
index cdfc4392047..2f27dc5a459 100755
--- a/config.guess
+++ b/config.guess
@@ -953,6 +953,9 @@  EOF
 	;;
     amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*)
 	GUESS=x86_64-pc-cygwin
+	exit ;;
+    amd64:MSYS*:*:* | x86_64:MSYS*:*:*)
+	echo x86_64-pc-msys
 	;;
     prep*:SunOS:5.*:*)
 	SUN_REL=`echo "$UNAME_RELEASE" | sed -e 's/[^.]*//'`
diff --git a/config.rpath b/config.rpath
index 4dea75957c2..4f12c27e029 100755
--- a/config.rpath
+++ b/config.rpath
@@ -109,7 +109,7 @@  hardcode_direct=no
 hardcode_minus_L=no
 
 case "$host_os" in
-  cygwin* | mingw* | pw32*)
+  cygwin* | msys* | mingw* | pw32*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -149,7 +149,7 @@  if test "$with_gnu_ld" = yes; then
         ld_shlibs=no
       fi
       ;;
-    cygwin* | mingw* | pw32*)
+    cygwin* | msys* | mingw* | pw32*)
       # hardcode_libdir_flag_spec is actually meaningless, as there is
       # no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -268,7 +268,7 @@  else
       ;;
     bsdi4*)
       ;;
-    cygwin* | mingw* | pw32*)
+    cygwin* | msys* | mingw* | pw32*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -437,7 +437,7 @@  case "$host_os" in
     ;;
   bsdi4*)
     ;;
-  cygwin* | mingw* | pw32*)
+  cygwin* | msys* | mingw* | pw32*)
     shrext=.dll
     ;;
   darwin* | rhapsody*)
diff --git a/config/dfp.m4 b/config/dfp.m4
index d1d151b2da7..6cc4d27ca6d 100644
--- a/config/dfp.m4
+++ b/config/dfp.m4
@@ -42,7 +42,8 @@  Valid choices are 'yes', 'bid', 'dpd', and 'no'.]) ;;
     powerpc*-*-linux* | i?86*-*-linux* | x86_64*-*-linux* | s390*-*-linux* | \
     i?86*-*-elfiamcu | i?86*-*-gnu* | x86_64*-*-gnu* | \
     i?86*-*-mingw* | x86_64*-*-mingw* | \
-    i?86*-*-cygwin* | x86_64*-*-cygwin*)
+    i?86*-*-cygwin* | x86_64*-*-cygwin* | \
+    i?86*-*-msys* | x86_64*-*-msys*)
       enable_decimal_float=yes
       ;;
     *)
diff --git a/config/elf.m4 b/config/elf.m4
index 1772a44318e..7d4f5054562 100644
--- a/config/elf.m4
+++ b/config/elf.m4
@@ -15,7 +15,7 @@  AC_REQUIRE([AC_CANONICAL_TARGET])
 
 target_elf=no
 case $target in
-  *-darwin* | *-aix* | *-cygwin* | *-mingw* | *-aout* | *-*coff* | \
+  *-darwin* | *-aix* | *-cygwin* |*-msys* |  *-mingw* | *-aout* | *-*coff* | \
   *-msdosdjgpp* | *-vms* | *-wince* | *-*-pe* | \
   alpha*-dec-osf* | *-interix* | hppa[[12]]*-*-hpux* | \
   nvptx-*-none)
diff --git a/config/lthostflags.m4 b/config/lthostflags.m4
index bc0f59ee79e..ad977d43dc5 100644
--- a/config/lthostflags.m4
+++ b/config/lthostflags.m4
@@ -13,7 +13,7 @@  AC_DEFUN([ACX_LT_HOST_FLAGS], [
 AC_REQUIRE([AC_CANONICAL_SYSTEM])
 
 case $host in
-  *-cygwin* | *-mingw*)
+  *-cygwin* | *-msys* | *-mingw*)
     # 'host' will be top-level target in the case of a target lib,
     # we must compare to with_cross_host to decide if this is a native
     # or cross-compiler and select where to install dlls appropriately.
diff --git a/config/mmap.m4 b/config/mmap.m4
index fba0d9d3657..df2c778524c 100644
--- a/config/mmap.m4
+++ b/config/mmap.m4
@@ -42,7 +42,7 @@  else
    # Systems known to be in this category are Windows (all variants),
    # VMS, and Darwin.
    case "$host_os" in
-     *vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00)
+     *vms* | cygwin* | msys* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00)
         gcc_cv_func_mmap_dev_zero=no ;;
      *)
         gcc_cv_func_mmap_dev_zero=yes;;
@@ -74,7 +74,7 @@  else
    # above for use of /dev/zero.
    # Systems known to be in this category are Windows, VMS, and SCO Unix.
    case "$host_os" in
-     *vms* | cygwin* | pe | mingw* | sco* | udk* )
+     *vms* | cygwin* | msys* | pe | mingw* | sco* | udk* )
         gcc_cv_func_mmap_anon=no ;;
      *)
         gcc_cv_func_mmap_anon=yes;;
diff --git a/config/picflag.m4 b/config/picflag.m4
index 3f3ac744c96..e7eb1f51989 100644
--- a/config/picflag.m4
+++ b/config/picflag.m4
@@ -25,6 +25,8 @@  case "${$2}" in
 	;;
     i[[34567]]86-*-cygwin* | x86_64-*-cygwin*)
 	;;
+    i[[34567]]86-*-msys* | x86_64-*-msys*)
+	;;
     i[[34567]]86-*-mingw* | x86_64-*-mingw*)
 	;;
     i[[34567]]86-*-interix[[3-9]]*)
diff --git a/config/tcl.m4 b/config/tcl.m4
index 4542a4b23d7..209bd8d9b8e 100644
--- a/config/tcl.m4
+++ b/config/tcl.m4
@@ -33,7 +33,7 @@  AC_DEFUN([SC_PATH_TCLCONFIG], [
 
 	    # First check to see if --with-tcl was specified.
 	    case "${host}" in
-		*-*-cygwin*) platDir="win" ;;
+		*-*-cygwin* | *-*-msys*) platDir="win" ;;
 		*) platDir="unix" ;;
 	    esac
 	    if test x"${with_tclconfig}" != x ; then
@@ -165,7 +165,7 @@  AC_DEFUN([SC_PATH_TKCONFIG], [
 
 	    # then check for a private Tk library
 	    case "${host}" in
-		*-*-cygwin*) platDir="win" ;;
+		*-*-cygwin* | *-*-msys*) platDir="win" ;;
 		*) platDir="unix" ;;
 	    esac
 	    if test x"${ac_cv_c_tkconfig}" = x ; then
diff --git a/configure b/configure
index 6466b97f3ec..6acbc3b0972 100755
--- a/configure
+++ b/configure
@@ -3180,7 +3180,7 @@  fi
 # Configure extra directories which are host specific
 
 case "${host}" in
-  *-cygwin*)
+  *-cygwin* | *-msys*)
     configdirs="$configdirs libtermcap" ;;
 esac
 
@@ -3608,7 +3608,7 @@  esac
 # Disable the go frontend on systems where it is known to not work. Please keep
 # this in sync with contrib/config-list.mk.
 case "${target}" in
-*-*-darwin* | *-*-cygwin* | *-*-mingw* | bpf-* )
+*-*-darwin* | *-*-cygwin* | *-*-msys* | *-*-mingw* | bpf-* )
     unsupported_languages="$unsupported_languages go"
     ;;
 esac
@@ -3640,7 +3640,7 @@  if test x$enable_libgo = x; then
 	# PR 46986
 	noconfigdirs="$noconfigdirs target-libgo"
 	;;
-    *-*-cygwin* | *-*-mingw*)
+    *-*-cygwin* | *-*-msys* | *-*-mingw*)
 	noconfigdirs="$noconfigdirs target-libgo"
 	;;
     bpf-*-*)
@@ -3935,7 +3935,7 @@  case "${target}" in
   i[3456789]86-*-mingw*)
     target_configdirs="$target_configdirs target-winsup"
     ;;
-  *-*-cygwin*)
+  *-*-cygwin* | *-*-msys*)
     target_configdirs="$target_configdirs target-libtermcap target-winsup"
     noconfigdirs="$noconfigdirs target-libgloss"
     # always build newlib if winsup directory is present.
@@ -4091,7 +4091,7 @@  case "${host}" in
   i[3456789]86-*-msdosdjgpp*)
     host_makefile_frag="config/mh-djgpp"
     ;;
-  *-cygwin*)
+  *-cygwin* | *-msys*)
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking to see if cat works as expected" >&5
 $as_echo_n "checking to see if cat works as expected... " >&6; }
@@ -8687,7 +8687,7 @@  fi
 
 target_elf=no
 case $target in
-  *-darwin* | *-aix* | *-cygwin* | *-mingw* | *-aout* | *-*coff* | \
+  *-darwin* | *-aix* | *-cygwin* |*-msys* |  *-mingw* | *-aout* | *-*coff* | \
   *-msdosdjgpp* | *-vms* | *-wince* | *-*-pe* | \
   alpha*-dec-osf* | *-interix* | hppa[12]*-*-hpux* | \
   nvptx-*-none)
@@ -8705,7 +8705,7 @@  if test $target_elf = yes; then :
 else
   if test x"$default_enable_lto" = x"yes" ; then
     case $target in
-      *-apple-darwin[912]* | *-cygwin* | *-mingw* | *djgpp*) ;;
+      *-apple-darwin[912]* | *-cygwin* | *-msys* | *-mingw* | *djgpp*) ;;
       # On other non-ELF platforms, LTO has yet to be validated.
       *) enable_lto=no ;;
     esac
@@ -8716,7 +8716,7 @@  else
   # warn during gcc/ subconfigure; unless you're bootstrapping with
   # -flto it won't be needed until after installation anyway.
     case $target in
-      *-cygwin* | *-mingw* | *-apple-darwin* | *djgpp*) ;;
+      *-cygwin* | *-msys* | *-mingw* | *-apple-darwin* | *djgpp*) ;;
       *) if test x"$enable_lto" = x"yes"; then
 	as_fn_error $? "LTO support is not enabled for this target." "$LINENO" 5
         fi
@@ -8726,7 +8726,7 @@  else
   # Among non-ELF, only Windows platforms support the lto-plugin so far.
   # Build it unless LTO was explicitly disabled.
   case $target in
-    *-cygwin* | *-mingw*) build_lto_plugin=$enable_lto ;;
+    *-cygwin* | *-msys* | *-mingw*) build_lto_plugin=$enable_lto ;;
     *) ;;
   esac
 
@@ -9831,7 +9831,7 @@  rm -f conftest*
 case "${host}" in
   *-*-hpux*) RPATH_ENVVAR=SHLIB_PATH ;;
   *-*-darwin*) RPATH_ENVVAR=DYLD_LIBRARY_PATH ;;
-  *-*-mingw* | *-*-cygwin ) RPATH_ENVVAR=PATH ;;
+  *-*-mingw* | *-*-cygwin | *-*-msys ) RPATH_ENVVAR=PATH ;;
   *) RPATH_ENVVAR=LD_LIBRARY_PATH ;;
 esac
 
@@ -10406,7 +10406,7 @@  case " $target_configdirs " in
   case " $target_configargs " in
   *" --with-newlib "*)
    case "$target" in
-    *-cygwin*)
+    *-cygwin* | *-msys*)
       FLAGS_FOR_TARGET=$FLAGS_FOR_TARGET' -L$$r/$(TARGET_SUBDIR)/winsup/cygwin -isystem $$s/winsup/cygwin/include'
       ;;
    esac
diff --git a/configure.ac b/configure.ac
index 1300a805fd8..e12cef9fbd0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -442,7 +442,7 @@  AC_ARG_ENABLE(default_compressed_debug_sections_algorithm,
 # Configure extra directories which are host specific
 
 case "${host}" in
-  *-cygwin*)
+  *-cygwin* | *-msys*)
     configdirs="$configdirs libtermcap" ;;
 esac
 
@@ -838,7 +838,7 @@  esac
 # Disable the go frontend on systems where it is known to not work. Please keep
 # this in sync with contrib/config-list.mk.
 case "${target}" in
-*-*-darwin* | *-*-cygwin* | *-*-mingw* | bpf-* )
+*-*-darwin* | *-*-cygwin* | *-*-msys* | *-*-mingw* | bpf-* )
     unsupported_languages="$unsupported_languages go"
     ;;
 esac
@@ -867,7 +867,7 @@  if test x$enable_libgo = x; then
 	# PR 46986
 	noconfigdirs="$noconfigdirs target-libgo"
 	;;
-    *-*-cygwin* | *-*-mingw*)
+    *-*-cygwin* | *-*-msys* | *-*-mingw*)
 	noconfigdirs="$noconfigdirs target-libgo"
 	;;
     bpf-*-*)
@@ -1162,7 +1162,7 @@  case "${target}" in
   i[[3456789]]86-*-mingw*)
     target_configdirs="$target_configdirs target-winsup"
     ;;
-  *-*-cygwin*)
+  *-*-cygwin* | *-*-msys*)
     target_configdirs="$target_configdirs target-libtermcap target-winsup"
     noconfigdirs="$noconfigdirs target-libgloss"
     # always build newlib if winsup directory is present.
@@ -1318,7 +1318,7 @@  case "${host}" in
   i[[3456789]]86-*-msdosdjgpp*)
     host_makefile_frag="config/mh-djgpp"
     ;;
-  *-cygwin*)
+  *-cygwin* | *-msys*)
     ACX_CHECK_CYGWIN_CAT_WORKS
     host_makefile_frag="config/mh-cygwin"
     ;;
@@ -1928,7 +1928,7 @@  ACX_ELF_TARGET_IFELSE([# ELF platforms build the lto-plugin always.
   build_lto_plugin=yes
 ],[if test x"$default_enable_lto" = x"yes" ; then
     case $target in
-      *-apple-darwin[[912]]* | *-cygwin* | *-mingw* | *djgpp*) ;;
+      *-apple-darwin[[912]]* | *-cygwin* | *-msys* | *-mingw* | *djgpp*) ;;
       # On other non-ELF platforms, LTO has yet to be validated.
       *) enable_lto=no ;;
     esac
@@ -1939,7 +1939,7 @@  ACX_ELF_TARGET_IFELSE([# ELF platforms build the lto-plugin always.
   # warn during gcc/ subconfigure; unless you're bootstrapping with
   # -flto it won't be needed until after installation anyway.
     case $target in
-      *-cygwin* | *-mingw* | *-apple-darwin* | *djgpp*) ;;
+      *-cygwin* | *-msys* | *-mingw* | *-apple-darwin* | *djgpp*) ;;
       *) if test x"$enable_lto" = x"yes"; then
 	AC_MSG_ERROR([LTO support is not enabled for this target.])
         fi
@@ -1949,7 +1949,7 @@  ACX_ELF_TARGET_IFELSE([# ELF platforms build the lto-plugin always.
   # Among non-ELF, only Windows platforms support the lto-plugin so far.
   # Build it unless LTO was explicitly disabled.
   case $target in
-    *-cygwin* | *-mingw*) build_lto_plugin=$enable_lto ;;
+    *-cygwin* | *-msys* | *-mingw*) build_lto_plugin=$enable_lto ;;
     *) ;;
   esac
 ])
@@ -2958,7 +2958,7 @@  rm -f conftest*
 case "${host}" in
   *-*-hpux*) RPATH_ENVVAR=SHLIB_PATH ;;
   *-*-darwin*) RPATH_ENVVAR=DYLD_LIBRARY_PATH ;;
-  *-*-mingw* | *-*-cygwin ) RPATH_ENVVAR=PATH ;;
+  *-*-mingw* | *-*-cygwin | *-*-msys ) RPATH_ENVVAR=PATH ;;
   *) RPATH_ENVVAR=LD_LIBRARY_PATH ;;
 esac
 
@@ -3528,7 +3528,7 @@  case " $target_configdirs " in
   case " $target_configargs " in
   *" --with-newlib "*)
    case "$target" in
-    *-cygwin*)
+    *-cygwin* | *-msys*)
       FLAGS_FOR_TARGET=$FLAGS_FOR_TARGET' -L$$r/$(TARGET_SUBDIR)/winsup/cygwin -isystem $$s/winsup/cygwin/include'
       ;;
    esac
diff --git a/gas/configure b/gas/configure
index e6811fe73bd..1be9325d829 100755
--- a/gas/configure
+++ b/gas/configure
@@ -5263,7 +5263,7 @@  else
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -5605,7 +5605,7 @@  bsdi[45]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -6221,7 +6221,7 @@  case $host_os in
 aix*)
   symcode='[BCDT]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[ABCDGISTW]'
   ;;
 hpux*)
@@ -7838,7 +7838,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -7920,7 +7920,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       lt_prog_compiler_pic='-DDLL_EXPORT'
@@ -8382,7 +8382,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -8497,7 +8497,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
       # as there is no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -8928,7 +8928,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       export_dynamic_flag_spec=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -9829,14 +9829,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -9858,6 +9858,12 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+      ;;
+    msys*)
+      # MSYS DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
       ;;
     mingw* | cegcc*)
@@ -10510,7 +10516,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;
@@ -15593,7 +15599,7 @@  case "${need_libm}" in
 yes)
   LIBM=
 case $host in
-*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
+*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-msys* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
   # These system don't have libm, or don't need it
   ;;
 *-ncr-sysv4.3*)
@@ -15926,7 +15932,7 @@  _ACEOF
 
 
 case "${host}" in
-*-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-windows*)
+*-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-msys* | *-*-windows*)
 
 $as_echo "#define USE_BINARY_FOPEN 1" >>confdefs.h
  ;;
diff --git a/gas/configure.tgt b/gas/configure.tgt
index 7c66734e362..e6003c95697 100644
--- a/gas/configure.tgt
+++ b/gas/configure.tgt
@@ -252,7 +252,7 @@  case ${generic_target} in
   i386-*-msdos*)			fmt=aout ;;
   i386-*-moss*)				fmt=elf ;;
   i386-*-pe)				fmt=coff em=pe ;;
-  i386-*-cygwin*)
+  i386-*-cygwin* | i386-*-msys*)
    case ${cpu} in
      x86_64*)				fmt=coff em=pep ;;
      i*)				fmt=coff em=pe ;;
diff --git a/gas/testsuite/gas/all/gas.exp b/gas/testsuite/gas/all/gas.exp
index b9ff43997cb..10298699496 100644
--- a/gas/testsuite/gas/all/gas.exp
+++ b/gas/testsuite/gas/all/gas.exp
@@ -181,8 +181,8 @@  switch -glob $target_triplet {
 	# failures.
 	setup_xfail "bfin-*-*" "i\[3-7\]86-*-*coff" \
 	    "i\[3-7\]86-*-*pe" "i\[3-7\]86-*-go32*" \
-	    "i\[3-7\]86-*-cygwin*" "i\[3-7\]86-*-mingw*" \
-	    "x86_64-*-cygwin*" "x86_64-*-mingw*"
+	    "i\[3-7\]86-*-cygwin*" "i\[3-7\]86-*-msys*" "i\[3-7\]86-*-mingw*" \
+	    "x86_64-*-cygwin*" "x86_64-*-msys*" "x86_64-*-mingw*"
 	run_dump_test redef3
 	gas_test_error "redef4.s" "" ".set for symbol already used as label"
 	gas_test_error "redef5.s" "" ".set for symbol already defined through .comm"
@@ -326,6 +326,7 @@  if {   ([istarget *-*-coff*] && ![istarget *c4x*-*-coff] && ![istarget *c54x*-*-
      || [istarget i*86-*-aix*] \
      || [istarget i*86-*-go32*] \
      || [istarget i*86-*-cygwin*] \
+     || [istarget i*86-*-msys*] \
      || [istarget x86_64-*-mingw*] \
      || [istarget i*86-*-*nt] \
      || [istarget i*86-*-interix*] } {
@@ -399,6 +400,7 @@  if {    ![istarget avr-*-*]
 
 if {  ([istarget "i*86-*-*pe*"] && ![istarget "i*86-*-openbsd*"]) \
     || [istarget "i*86-*-cygwin*"] \
+    || [istarget "i*86-*-msys*"] \
     || [istarget "i*86-*-mingw32*"] } {
   gas_test "fastcall.s" ""   "" "fastcall labels"
 }
diff --git a/gdb/NEWS b/gdb/NEWS
index 2638b3e0d9c..b4d658f9b35 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -13,6 +13,8 @@ 
   the background, resulting in faster startup.  This can be controlled
   using "maint set dwarf synchronous".
 
+* Added built-in support for building on MSYS2 platform.
+
 * Changed commands
 
 disassemble
@@ -47,6 +49,11 @@  set remote thread-options-packet
 show remote thread-options-packet
   Set/show the use of the thread options packet.
 
+* New targets
+
+i686/MSYS			i686-*-msys*
+x86_64/MSYS			x86_64-*-msys*
+
 * New features in the GDB remote stub, GDBserver
 
   ** The --remote-debug and --event-loop-debug command line options
diff --git a/gdb/configure b/gdb/configure
index d0fd1760b88..37995cc54ea 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -5942,7 +5942,7 @@  else
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -6284,7 +6284,7 @@  bsdi[45]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -6942,7 +6942,7 @@  case $host_os in
 aix*)
   symcode='[BCDT]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[ABCDGISTW]'
   ;;
 hpux*)
@@ -8560,7 +8560,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -8642,7 +8642,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       lt_prog_compiler_pic='-DDLL_EXPORT'
@@ -9104,7 +9104,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -9219,7 +9219,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
       # as there is no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -9650,7 +9650,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       export_dynamic_flag_spec=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -10551,14 +10551,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -10580,6 +10580,12 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+      ;;
+    msys*)
+      # Msys DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
       ;;
     mingw* | cegcc*)
@@ -11232,7 +11238,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;
@@ -12454,7 +12460,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         esac
         ;;
 
-      cygwin* | mingw* | pw32* | cegcc*)
+      cygwin* | msys* | mingw* | pw32* | cegcc*)
         # _LT_TAGVAR(hardcode_libdir_flag_spec, CXX) is actually meaningless,
         # as there is no search path for DLLs.
         hardcode_libdir_flag_spec_CXX='-L$libdir'
@@ -13424,7 +13430,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
     beos* | irix5* | irix6* | nonstopux* | osf3* | osf4* | osf5*)
       # PIC is the default for these OSes.
       ;;
-    mingw* | cygwin* | os2* | pw32* | cegcc*)
+    mingw* | cygwin* | msys* | os2* | pw32* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -13964,7 +13970,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   pw32*)
     export_symbols_cmds_CXX="$ltdll_cmds"
   ;;
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     export_symbols_cmds_CXX='$NM $libobjs $convenience | $global_symbol_pipe | $SED -e '\''/^[BCDGRS][ ]/s/.*[ ]\([^ ]*\)/\1 DATA/;/^.*[ ]__nm__/s/^.*[ ]__nm__\([^ ]*\)[ ][^ ]*/\1 DATA/;/^I[ ]/d;/^[AITW][ ]/s/.* //'\'' | sort | uniq > $export_symbols'
   ;;
   *)
@@ -14228,14 +14234,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -14257,6 +14263,11 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      ;;
+    msys*)
+      # Msys DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       ;;
     mingw* | cegcc*)
       # MinGW DLLs use traditional 'lib' prefix
@@ -26997,7 +27008,7 @@  fi
 # have a separate termcap library, or no curses library at all.
 
 case $host_os in
-  cygwin*)
+  cygwin* | msys*)
     if test -d "$srcdir/libtermcap"; then
       LIBS="../libtermcap/libtermcap.a $LIBS"
       ac_cv_search_tgetent="../libtermcap/libtermcap.a"
@@ -31432,7 +31443,7 @@  WIN32LIBS=
 if test x"$gdb_cv_os_cygwin" = xyes; then
     WIN32LIBS="-luser32"
     case "${target}" in
-	*cygwin*) WIN32LIBS="$WIN32LIBS -limagehlp"
+	*cygwin* | *msys*) WIN32LIBS="$WIN32LIBS -limagehlp"
 	;;
     esac
 fi
@@ -32130,7 +32141,7 @@  WIN32LDAPP=
 
 
 case "${host}" in
-*-*-cygwin* | *-*-mingw* )
+*-*-cygwin* | *-*-msys* | *-*-mingw* )
     configdir="win"
     ;;
 *)
@@ -32173,7 +32184,7 @@  else
 
 	    # First check to see if --with-tcl was specified.
 	    case "${host}" in
-		*-*-cygwin*) platDir="win" ;;
+		*-*-cygwin* | *-*-msys*) platDir="win" ;;
 		*) platDir="unix" ;;
 	    esac
 	    if test x"${with_tclconfig}" != x ; then
@@ -32302,7 +32313,7 @@  else
 
 	    # then check for a private Tk library
 	    case "${host}" in
-		*-*-cygwin*) platDir="win" ;;
+		*-*-cygwin* | *-*-msys*) platDir="win" ;;
 		*) platDir="unix" ;;
 	    esac
 	    if test x"${ac_cv_c_tkconfig}" = x ; then
diff --git a/gdb/configure.ac b/gdb/configure.ac
index aa91bfb3a17..cc2a83a84a5 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -586,7 +586,7 @@  fi
 # have a separate termcap library, or no curses library at all.
 
 case $host_os in
-  cygwin*)
+  cygwin* | msys*)
     if test -d "$srcdir/libtermcap"; then
       LIBS="../libtermcap/libtermcap.a $LIBS"
       ac_cv_search_tgetent="../libtermcap/libtermcap.a"
@@ -1841,7 +1841,7 @@  WIN32LIBS=
 if test x"$gdb_cv_os_cygwin" = xyes; then
     WIN32LIBS="-luser32"
     case "${target}" in
-	*cygwin*) WIN32LIBS="$WIN32LIBS -limagehlp"
+	*cygwin* | *msys*) WIN32LIBS="$WIN32LIBS -limagehlp"
 	;;
     esac
 fi
@@ -1905,7 +1905,7 @@  AC_SUBST(WIN32LIBS)
 AC_SUBST(WIN32LDAPP)
 
 case "${host}" in
-*-*-cygwin* | *-*-mingw* )
+*-*-cygwin* | *-*-msys* | *-*-mingw* )
     configdir="win"
     ;;
 *)
diff --git a/gdb/configure.host b/gdb/configure.host
index da71675b201..deb1bd7ec48 100644
--- a/gdb/configure.host
+++ b/gdb/configure.host
@@ -115,6 +115,7 @@  i[34567]86-*-openbsd*)	gdb_host=obsd ;;
 i[34567]86-*-solaris2* | x86_64-*-solaris2*)
 			gdb_host=sol2 ;;
 i[34567]86-*-cygwin*)	gdb_host=cygwin ;;
+i[34567]86-*-msys*)	gdb_host=msys ;;
 
 ia64-*-linux*)		gdb_host=linux ;;
 
@@ -184,6 +185,7 @@  x86_64-*-mingw*)        gdb_host=mingw64
 			gdb_host_obs=mingw-hdep.o
 			;;
 x86_64-*-cygwin*)	gdb_host=cygwin64 ;;
+x86_64-*-msys*)	gdb_host=msys64 ;;
 m32r*-*-linux*)          gdb_host=linux ;;
 
 xtensa*-*-linux*)	gdb_host=linux ;;
diff --git a/gdb/configure.nat b/gdb/configure.nat
index 8b98511cef7..d17b1926031 100644
--- a/gdb/configure.nat
+++ b/gdb/configure.nat
@@ -77,6 +77,9 @@  case ${gdb_host} in
     cygwin*)
 	NATDEPFILES='x86-nat.o nat/x86-dregs.o windows-nat.o nat/windows-nat.o'
 	;;
+    msys*)
+	NATDEPFILES='x86-nat.o nat/x86-dregs.o windows-nat.o nat/windows-nat.o'
+	;;
     mingw*)
 	NATDEPFILES='x86-nat.o nat/x86-dregs.o windows-nat.o nat/windows-nat.o'
 	;;
@@ -123,7 +126,7 @@  case ${gdb_host} in
 		;;
 	esac
 	;;
-    cygwin)
+    cygwin | msys)
 	case ${gdb_host_cpu} in
 	    i386)
 		# Native config information for GDB on i386
@@ -132,7 +135,7 @@  case ${gdb_host} in
 		;;
 	esac
 	;;
-    cygwin64)
+    cygwin64 | msys64)
 	case ${gdb_host_cpu} in
 	    i386)
 		# Native config information for GDB on amd64
diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index 47a674201f9..136da0a333b 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -334,6 +334,11 @@  i[34567]86-*-cygwin*)
 	# Target: Intel 386 running win32
 	gdb_target_obs="i386-windows-tdep.o windows-tdep.o"
 	;;
+i[34567]86-*-msys*)
+	# Target: Intel 386 running win32
+	gdb_target_obs="i386-windows-tdep.o windows-tdep.o"
+	build_gdbserver=yes
+	;;
 i[34567]86-*-mingw32*)
 	# Target: Intel 386 running win32
 	gdb_target_obs="i386-windows-tdep.o windows-tdep.o"
@@ -725,7 +730,7 @@  x86_64-*-freebsd* | x86_64-*-kfreebsd*-gnu)
 	gdb_target_obs="amd64-fbsd-tdep.o ${i386_tobjs} \
 			i386-bsd-tdep.o i386-fbsd-tdep.o"
 	;;
-x86_64-*-mingw* | x86_64-*-cygwin*)
+x86_64-*-mingw* | x86_64-*-cygwin* | x86_64-*-msys*)
         # Target: MingW/amd64
 	gdb_target_obs="amd64-windows-tdep.o \
                         ${i386_tobjs} i386-windows-tdep.o \
diff --git a/gdb/testsuite/gdb.base/bigcore.exp b/gdb/testsuite/gdb.base/bigcore.exp
index 3f9ae48abf2..c3e39a9cbad 100644
--- a/gdb/testsuite/gdb.base/bigcore.exp
+++ b/gdb/testsuite/gdb.base/bigcore.exp
@@ -30,7 +30,8 @@  require isnative
 if { [istarget "*-*-*bsd*"]
      || [istarget "*-*-solaris*"] 
      || [istarget "*-*-darwin*"] 
-     || [istarget "*-*-cygwin*"] } {
+     || [istarget "*-*-cygwin*"] 
+     || [istarget "*-*-msys*"] } {
     untested "kernel lacks sparse corefile support (PR gdb/1551)"
     return
 }
diff --git a/gdb/testsuite/gdb.base/fileio.exp b/gdb/testsuite/gdb.base/fileio.exp
index 4b01248ca2d..657e6f582b8 100644
--- a/gdb/testsuite/gdb.base/fileio.exp
+++ b/gdb/testsuite/gdb.base/fileio.exp
@@ -240,7 +240,7 @@  gdb_test continue \
 
 # This test fails on Cygwin because unlink() succeeds on Win32 systems
 # in that situation.
-if [ishost *cygwin*] {
+if { ([ishost *cygwin*] || [ishost *msys*]) } {
     setup_xfail "*-*-*"
 }
 # If the user is root, we will always have write permission.
diff --git a/gdb/testsuite/gdb.base/maint.exp b/gdb/testsuite/gdb.base/maint.exp
index d6aa22321f1..632bac4063c 100644
--- a/gdb/testsuite/gdb.base/maint.exp
+++ b/gdb/testsuite/gdb.base/maint.exp
@@ -188,7 +188,7 @@  gdb_test "maint set per-command off" \
 # The timeout value is raised, because printing all the symbols and
 # statistical information about Cygwin and Windows libraries takes a lot
 # of time.
-if [istarget "*-*-cygwin*"] {
+if { ([istarget "*-*-cygwin*"] || [istarget "*-*-msys*"]) } {
 	set oldtimeout $timeout
 	set timeout [expr $timeout + 500]
 }
diff --git a/gdb/testsuite/gdb.base/shreloc.exp b/gdb/testsuite/gdb.base/shreloc.exp
index 82e6ec6a735..6d81d8c0199 100644
--- a/gdb/testsuite/gdb.base/shreloc.exp
+++ b/gdb/testsuite/gdb.base/shreloc.exp
@@ -38,7 +38,7 @@  set lib2_sl [standard_output_file shreloc2.sl]
 set lib_opts "debug"
 set exec_opts [list debug shlib=$lib1_sl shlib=$lib2_sl]
 
-if {([istarget "*pc-cygwin"] || [istarget "*pc-mingw32"]) } {
+if {([istarget "*pc-cygwin"] || [istarget "*pc-mingw32"] || [istarget "*pc-msys"]) } {
     lappend lib_opts "ldflags=-Wl,--image-base,0x04000000"
 }
 
@@ -219,7 +219,7 @@  if [send_gdb_discard "maint print msymbols ${msymfile}"] {
     }
 }
 
-if {([istarget "*pc-cygwin"] || [istarget "*pc-mingw32"]) } {
+if {([istarget "*pc-cygwin"] || [istarget "*pc-mingw32"] || [istarget "*pc-msys"]) } {
     #
     # We know the names of some absolute symbols included in the
     # portable-executable (DLL) format. Check that they didn't get
diff --git a/gdb/testsuite/gdb.base/solib-weak.exp b/gdb/testsuite/gdb.base/solib-weak.exp
index 1ed552cc09a..986faba7ee7 100644
--- a/gdb/testsuite/gdb.base/solib-weak.exp
+++ b/gdb/testsuite/gdb.base/solib-weak.exp
@@ -22,7 +22,8 @@  require allow_shlib_tests
 # These targets have shared libraries, but weak symbols are not meaningful.
 if {([istarget *-*-mingw*]
      || [istarget *-*-cygwin*]
-     || [istarget *-*-pe*])} {
+     || [istarget *-*-pe*]
+     || [istarget *-*-msys*]) } {
     return 0
 }
 
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-dos-drive.exp b/gdb/testsuite/gdb.dwarf2/dw2-dos-drive.exp
index f21f6bf1157..71fc1cf89b0 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-dos-drive.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-dos-drive.exp
@@ -30,7 +30,8 @@  gdb_test_no_output "set breakpoint pending off"
 gdb_test "break 'z:file.c':func" {Breakpoint [0-9]+ at .*}
 
 set dos [expr [istarget "*-*-cygwin*"] || [istarget "i?86-*-mingw*"] \
-	      || [istarget "*-*-msdosdjgpp*"] || [istarget "*-*-go32*"] ]
+	      || [istarget "*-*-msdosdjgpp*"] || [istarget "*-*-go32*"] \
+	      || [istarget "*-*-msys*"] ]
 
 if { $dos } {
     gdb_test "break file.c:func" {Breakpoint [0-9]+ at .*}
diff --git a/gdb/testsuite/gdb.server/wrapper.exp b/gdb/testsuite/gdb.server/wrapper.exp
index 1ca19bff552..e48948f27a5 100644
--- a/gdb/testsuite/gdb.server/wrapper.exp
+++ b/gdb/testsuite/gdb.server/wrapper.exp
@@ -24,7 +24,8 @@  standard_testfile
 require allow_gdbserver_tests
 
 if { [istarget *-*-mingw*]
-     || [istarget *-*-cygwin*] } {
+     || [istarget *-*-cygwin*]
+     || [istarget *-*-msys*] } {
     unsupported "gdbserver does not support --wrapper on this target (PR server/15967)"
     return -1
 }
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index fe4ac7d2719..fcc1d1c2ac2 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -2646,7 +2646,8 @@  proc allow_shlib_tests {} {
 	 || [istarget *-*-solaris2*]
 	 || [istarget *-*-mingw*]
 	 || [istarget *-*-cygwin*]
-	 || [istarget *-*-pe*])} {
+	 || [istarget *-*-pe*]
+	 || [istarget *-*-msys*])} {
 	return 1
     }
 
@@ -5323,7 +5324,8 @@  proc gdb_compile {source dest type options} {
 		lappend source "-Wl,$shlib_name"
 	    } elseif { ([istarget "*-*-mingw*"]
 			|| [istarget *-*-cygwin*]
-			|| [istarget *-*-pe*])} {
+			|| [istarget *-*-pe*]
+			|| [istarget *-*-msys*])} {
 		lappend source "${shlib_name}.a"
             } else {
                lappend source $shlib_name
@@ -5331,7 +5333,8 @@  proc gdb_compile {source dest type options} {
             if { $shlib_found == 0 } {
                 set shlib_found 1
 		if { ([istarget "*-*-mingw*"]
-		      || [istarget *-*-cygwin*]) } {
+		      || [istarget *-*-cygwin*]
+		      || [istarget *-*-msys*]) } {
 		    lappend new_options "ldflags=-Wl,--enable-auto-import"
 		}
 		if { [test_compiler_info "gcc-*"] || [test_compiler_info "clang-*"] } {
@@ -5424,6 +5427,7 @@  proc gdb_compile {source dest type options} {
     if { $shlib_load || $shlib_found } {
 	if { ([istarget "*-*-mingw*"]
 	      || [istarget *-*-cygwin*]
+	      || [istarget *-*-msys*]
 	      || [istarget *-*-pe*]) } {
 	    # Do not need anything.
 	} elseif { [istarget *-*-freebsd*] || [istarget *-*-openbsd*] } {
@@ -5522,7 +5526,8 @@  proc gdb_compile {source dest type options} {
     if { $type == "executable" } {
 	if { ([istarget "*-*-mingw*"]
 	      || [istarget "*-*-*djgpp"]
-	      || [istarget "*-*-cygwin*"])} {
+	      || [istarget "*-*-cygwin*"]
+	      || [istarget "*-*-msys*"])} {
 	    # Force output to unbuffered mode, by linking in an object file
 	    # with a global contructor that calls setvbuf.
 	    #
@@ -5668,6 +5673,7 @@  proc gdb_compile_shlib_1 {sources dest options} {
         }
 	"clang-*" {
 	    if { [istarget "*-*-cygwin*"]
+		 || [istarget *-*-msys*]
 		 || [istarget "*-*-mingw*"] } {
 		lappend obj_options "additional_flags=-fPIC"
 	    } else {
@@ -5678,6 +5684,7 @@  proc gdb_compile_shlib_1 {sources dest options} {
             if { [istarget "powerpc*-*-aix*"]
                    || [istarget "rs6000*-*-aix*"]
                    || [istarget "*-*-cygwin*"]
+                   || [istarget "*-*-msys*"]
                    || [istarget "*-*-mingw*"]
                    || [istarget "*-*-pe*"] } {
                 lappend obj_options "additional_flags=-fPIC"
@@ -5743,6 +5750,7 @@  proc gdb_compile_shlib_1 {sources dest options} {
 
 	if { ([istarget "*-*-mingw*"]
 	      || [istarget *-*-cygwin*]
+	      || [istarget *-*-msys*]
 	      || [istarget *-*-pe*]) } {
 	    if { [is_remote host] } {
 		set name [file tail ${dest}]
@@ -5770,6 +5778,7 @@  proc gdb_compile_shlib_1 {sources dest options} {
     if { [is_remote host]
 	 && ([istarget "*-*-mingw*"]
 	     || [istarget *-*-cygwin*]
+	     || [istarget *-*-msys*]
 	     || [istarget *-*-pe*]) } {
 	set dest_tail_name [file tail ${dest}]
 	remote_upload host $dest_tail_name.a ${dest}.a
@@ -6201,7 +6210,7 @@  proc kill_wait_spawned_process { proc_spawn_id } {
 proc spawn_id_get_pid { spawn_id } {
     set testpid [exp_pid -i $spawn_id]
 
-    if { [istarget "*-*-cygwin*"] } {
+    if { ([istarget "*-*-cygwin*"] || [istarget *-*-msys*]) } {
 	# testpid is the Cygwin PID, GDB uses the Windows PID, which
 	# might be different due to the way fork/exec works.
 	set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
@@ -7760,6 +7769,7 @@  gdb_caching_proc gdb_has_argv0 {} {
 	  || [istarget *-*-aix*]
 	  || [istarget *-*-gnu*]
 	  || [istarget *-*-cygwin*] || [istarget *-*-mingw32*]
+	  || [istarget *-*-msys*]
 	  || [istarget *-*-*djgpp*] || [istarget *-*-go32*]
 	  || [istarget *-wince-pe] || [istarget *-*-mingw32ce*]
 	  || [istarget *-*-osf*]
@@ -7794,7 +7804,7 @@  gdb_caching_proc gdb_has_argv0 {} {
 
 proc get_build_id { filename } {
     if { ([istarget "*-*-mingw*"]
-	  || [istarget *-*-cygwin*]) } {
+	  || [istarget *-*-cygwin*] || [istarget *-*-msys*]) } {
 	set objdump_program [gdb_find_objdump]
 	set result [catch {set data [exec $objdump_program -p $filename | grep signature | cut "-d " -f4]} output]
 	verbose "result is $result"
diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index a90388922e2..5428715270d 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -894,11 +894,19 @@  windows_make_so (const char *name, LPVOID load_addr)
 	  so->name = so->original_name;
 	}
     }
+#ifdef __MSYS__
+  /* Record msys-2.0.dll .text start/end.  */
+  size_t len = sizeof ("/msys-2.0.dll") - 1;
+  if (so->name.size () >= len
+      && strcasecmp (so->name.c_str () + so->name.size () - len,
+		     "/msys-2.0.dll") == 0)
+#else
   /* Record cygwin1.dll .text start/end.  */
   size_t len = sizeof ("/cygwin1.dll") - 1;
   if (so->name.size () >= len
       && strcasecmp (so->name.c_str () + so->name.size () - len,
 		     "/cygwin1.dll") == 0)
+#endif
     {
       asection *text = NULL;
 
diff --git a/gdbserver/configure.srv b/gdbserver/configure.srv
index 9e861a75088..a9e16f79a10 100644
--- a/gdbserver/configure.srv
+++ b/gdbserver/configure.srv
@@ -94,7 +94,7 @@  case "${gdbserver_host}" in
 			srv_linux_regsets=yes
 			srv_linux_thread_db=yes
 			;;
-  i[34567]86-*-cygwin*)	srv_regobj=""
+  i[34567]86-*-cygwin* | i[34567]86-*-msys*)	srv_regobj=""
 			srv_tgtobj="x86-low.o nat/x86-dregs.o win32-low.o"
 			srv_tgtobj="${srv_tgtobj} win32-i386-low.o"
 			srv_tgtobj="${srv_tgtobj} nat/windows-nat.o"
@@ -387,7 +387,7 @@  case "${gdbserver_host}" in
 			srv_tgtobj="${srv_tgtobj} arch/amd64.o arch/i386.o"
 			srv_mingw=yes
 			;;
-  x86_64-*-cygwin*)	srv_regobj=""
+  x86_64-*-cygwin* | x86_64-*-msys*)	srv_regobj=""
 			srv_tgtobj="x86-low.o nat/x86-dregs.o"
 			srv_tgtobj="${srv_tgtobj} nat/x86-xstate.o i387-fp.o"
 			srv_tgtobj="${srv_tgtobj} win32-low.o win32-i386-low.o"
diff --git a/gnulib/configure b/gnulib/configure
index cb2a11359a1..f1fd9a3febc 100755
--- a/gnulib/configure
+++ b/gnulib/configure
@@ -9124,7 +9124,7 @@  else
         # special semantics and is distinct from /, please report it to
         # <bug-gnulib@gnu.org>.
         case $host in
-          *-cygwin | i370-ibm-openedition)
+          *-cygwin | *-msys | i370-ibm-openedition)
             gl_cv_double_slash_root=yes ;;
           *)
             # Be optimistic and assume that / and // are the same when we
@@ -23563,7 +23563,7 @@  else
         # special semantics and is distinct from /, please report it to
         # <bug-gnulib@gnu.org>.
         case $host in
-          *-cygwin | i370-ibm-openedition)
+          *-cygwin | *-msys | i370-ibm-openedition)
             gl_cv_double_slash_root=yes ;;
           *)
             # Be optimistic and assume that / and // are the same when we
@@ -23711,7 +23711,7 @@  else
   case "$host_os" in
          mingw*) # on this platform, dup2 always returns 0 for success
            gl_cv_func_dup2_works="guessing no" ;;
-         cygwin*) # on cygwin 1.5.x, dup2(1,1) returns 0
+         cygwin* | msys*) # on cygwin 1.5.x, dup2(1,1) returns 0
            gl_cv_func_dup2_works="guessing no" ;;
          aix* | freebsd*)
                  # on AIX 7.1 and FreeBSD 6.1, dup2 (1,toobig) gives EMFILE,
@@ -24112,7 +24112,7 @@  if ${gl_cv_func_fcntl_f_dupfd_works+:} false; then :
 else
   if test "$cross_compiling" = yes; then :
   case $host_os in
-            aix* | cygwin* | haiku*)
+            aix* | cygwin* | msys* | haiku*)
                gl_cv_func_fcntl_f_dupfd_works="guessing no" ;;
             *) gl_cv_func_fcntl_f_dupfd_works="guessing yes" ;;
           esac
diff --git a/gnulib/import/m4/double-slash-root.m4 b/gnulib/import/m4/double-slash-root.m4
index 09ff5f0d17a..1e11243ff02 100644
--- a/gnulib/import/m4/double-slash-root.m4
+++ b/gnulib/import/m4/double-slash-root.m4
@@ -16,7 +16,7 @@  AC_DEFUN([gl_DOUBLE_SLASH_ROOT],
         # special semantics and is distinct from /, please report it to
         # <bug-gnulib@gnu.org>.
         case $host in
-          *-cygwin | i370-ibm-openedition)
+          *-cygwin | *-msys | i370-ibm-openedition)
             gl_cv_double_slash_root=yes ;;
           *)
             # Be optimistic and assume that / and // are the same when we
diff --git a/gnulib/import/m4/dup2.m4 b/gnulib/import/m4/dup2.m4
index 7e777cdee6a..62ad578c090 100644
--- a/gnulib/import/m4/dup2.m4
+++ b/gnulib/import/m4/dup2.m4
@@ -69,7 +69,7 @@  AC_DEFUN([gl_FUNC_DUP2],
       [case "$host_os" in
          mingw*) # on this platform, dup2 always returns 0 for success
            gl_cv_func_dup2_works="guessing no" ;;
-         cygwin*) # on cygwin 1.5.x, dup2(1,1) returns 0
+         cygwin* | msys*) # on cygwin 1.5.x, dup2(1,1) returns 0
            gl_cv_func_dup2_works="guessing no" ;;
          aix* | freebsd*)
                  # on AIX 7.1 and FreeBSD 6.1, dup2 (1,toobig) gives EMFILE,
diff --git a/gnulib/import/m4/fcntl.m4 b/gnulib/import/m4/fcntl.m4
index 428e5709d30..84f84fbb3dc 100644
--- a/gnulib/import/m4/fcntl.m4
+++ b/gnulib/import/m4/fcntl.m4
@@ -70,7 +70,7 @@  AC_DEFUN([gl_FUNC_FCNTL],
          [gl_cv_func_fcntl_f_dupfd_works=yes],
          [gl_cv_func_fcntl_f_dupfd_works=no],
          [case $host_os in
-            aix* | cygwin* | haiku*)
+            aix* | cygwin* | msys* | haiku*)
                gl_cv_func_fcntl_f_dupfd_works="guessing no" ;;
             *) gl_cv_func_fcntl_f_dupfd_works="guessing yes" ;;
           esac])])
diff --git a/gprof/configure b/gprof/configure
index 6c9d8701c48..4186345c74a 100755
--- a/gprof/configure
+++ b/gprof/configure
@@ -5141,7 +5141,7 @@  else
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -5483,7 +5483,7 @@  bsdi[45]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -6099,7 +6099,7 @@  case $host_os in
 aix*)
   symcode='[BCDT]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[ABCDGISTW]'
   ;;
 hpux*)
@@ -7716,7 +7716,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -7798,7 +7798,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       lt_prog_compiler_pic='-DDLL_EXPORT'
@@ -8260,7 +8260,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -8375,7 +8375,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
       # as there is no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -8806,7 +8806,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       export_dynamic_flag_spec=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -9707,14 +9707,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -9736,6 +9736,12 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+      ;;
+    msys*)
+      # MSYS DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
       ;;
     mingw* | cegcc*)
@@ -10388,7 +10394,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;
diff --git a/ld/configure b/ld/configure
index 96ef1f8bb65..1c1253d6c0f 100755
--- a/ld/configure
+++ b/ld/configure
@@ -6168,7 +6168,7 @@  else
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -6510,7 +6510,7 @@  bsdi[45]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -7126,7 +7126,7 @@  case $host_os in
 aix*)
   symcode='[BCDT]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[ABCDGISTW]'
   ;;
 hpux*)
@@ -8744,7 +8744,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -8826,7 +8826,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       lt_prog_compiler_pic='-DDLL_EXPORT'
@@ -9288,7 +9288,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -9403,7 +9403,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
       # as there is no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -9834,7 +9834,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       export_dynamic_flag_spec=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -10735,14 +10735,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -10764,6 +10764,12 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+      ;;
+    msys*)
+      # MSYS DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
       ;;
     mingw* | cegcc*)
@@ -11416,7 +11422,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;
@@ -12638,7 +12644,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         esac
         ;;
 
-      cygwin* | mingw* | pw32* | cegcc*)
+      cygwin* | msys* | mingw* | pw32* | cegcc*)
         # _LT_TAGVAR(hardcode_libdir_flag_spec, CXX) is actually meaningless,
         # as there is no search path for DLLs.
         hardcode_libdir_flag_spec_CXX='-L$libdir'
@@ -13608,7 +13614,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
     beos* | irix5* | irix6* | nonstopux* | osf3* | osf4* | osf5*)
       # PIC is the default for these OSes.
       ;;
-    mingw* | cygwin* | os2* | pw32* | cegcc*)
+    mingw* | cygwin* | msys* | os2* | pw32* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -14148,7 +14154,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   pw32*)
     export_symbols_cmds_CXX="$ltdll_cmds"
   ;;
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     export_symbols_cmds_CXX='$NM $libobjs $convenience | $global_symbol_pipe | $SED -e '\''/^[BCDGRS][ ]/s/.*[ ]\([^ ]*\)/\1 DATA/;/^.*[ ]__nm__/s/^.*[ ]__nm__\([^ ]*\)[ ][^ ]*/\1 DATA/;/^I[ ]/d;/^[AITW][ ]/s/.* //'\'' | sort | uniq > $export_symbols'
   ;;
   *)
@@ -14412,14 +14418,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -14441,6 +14447,11 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      ;;
+    msys*)
+      # MSYS DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       ;;
     mingw* | cegcc*)
       # MinGW DLLs use traditional 'lib' prefix
@@ -18741,7 +18752,7 @@  done
 
 
 case "${host}" in
-*-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-windows*)
+*-*-msdos* | *-*-go32* | *-*-mingw32* | *-*-cygwin* | *-*-msys* | *-*-windows*)
 
 $as_echo "#define USE_BINARY_FOPEN 1" >>confdefs.h
  ;;
diff --git a/ld/configure.tgt b/ld/configure.tgt
index f937f78b876..415378110d9 100644
--- a/ld/configure.tgt
+++ b/ld/configure.tgt
@@ -429,7 +429,7 @@  i[3-7]86-*-winnt*)	targ_emul=i386pe ;
 i[3-7]86-*-pe)		targ_emul=i386pe ;
 			targ_extra_ofiles="deffilep.o pdb.o pe-dll.o"
 			;;
-i[3-7]86-*-cygwin*)	targ_emul=i386pe ;
+i[3-7]86-*-cygwin* | i[3-7]86-*-msys*)	targ_emul=i386pe ;
 			targ_extra_ofiles="deffilep.o pdb.o pe-dll.o" ;
 			test "$targ" != "$host" && LIB_PATH='${tooldir}/lib/w32api'
 			;;
@@ -1060,7 +1060,7 @@  x86_64-*-pe | x86_64-*-pep) targ_emul=i386pep ;
 			targ_extra_emuls=i386pe ;
 			targ_extra_ofiles="deffilep.o pdb.o pep-dll-x86_64.o pe-dll.o"
 			;;
-x86_64-*-cygwin)	targ_emul=i386pep ;
+x86_64-*-cygwin | x86_64-*-msys)	targ_emul=i386pep ;
 			targ_extra_emuls=i386pe
 			targ_extra_ofiles="deffilep.o pdb.o pep-dll.o pe-dll.o"
 			test "$targ" != "$host" && LIB_PATH='${tooldir}/lib/w32api'
@@ -1145,7 +1145,7 @@  spu-*-elf*)
   NATIVE_LIB_DIRS='/lib'
   ;;
 
-i[03-9x]86-*-cygwin* | x86_64-*-cygwin*)
+i[03-9x]86-*-cygwin* | x86_64-*-cygwin* | i[03-9x]86-*-msys* | x86_64-*-msys*)
   NATIVE_LIB_DIRS='/usr/lib /usr/lib/w32api'
   ;;
 
diff --git a/ld/emultempl/pe.em b/ld/emultempl/pe.em
index 9ab5e6ef481..090db3f8acc 100644
--- a/ld/emultempl/pe.em
+++ b/ld/emultempl/pe.em
@@ -7,7 +7,7 @@  else
 fi
 
 case ${target} in
-  *-*-cygwin*)
+  *-*-cygwin* | *-*-msys*)
     cygwin_behavior=1
     ;;
   *)
@@ -208,7 +208,7 @@  EOF
 # merge_rdata defaults to 0 for cygwin:
 #  http://cygwin.com/ml/cygwin-apps/2013-04/msg00187.html
 case ${target} in
-  *-*-cygwin*)
+  *-*-cygwin* | *-*-msys*)
     default_auto_import=1
     default_merge_rdata=0
     ;;
diff --git a/ld/emultempl/pep.em b/ld/emultempl/pep.em
index 00c4ea9e15a..f625973dffa 100644
--- a/ld/emultempl/pep.em
+++ b/ld/emultempl/pep.em
@@ -7,7 +7,7 @@  else
 fi
 
 case ${target} in
-  *-*-cygwin*)
+  *-*-cygwin* | *-*-msys*)
     move_default_addr_high=1
     cygwin_behavior=1
     ;;
diff --git a/ld/pe-dll.c b/ld/pe-dll.c
index 95eef84f607..536d4b60832 100644
--- a/ld/pe-dll.c
+++ b/ld/pe-dll.c
@@ -210,6 +210,7 @@  static const autofilter_entry_type autofilter_symbollist_i386[] =
   { STRING_COMMA_LEN ("_NULL_IMPORT_DESCRIPTOR") },
   /* Entry point symbols, and entry hooks.  */
   { STRING_COMMA_LEN ("cygwin_crt0") },
+  { STRING_COMMA_LEN ("msys_crt0") },
 #ifdef pe_use_plus
   { STRING_COMMA_LEN ("DllMain") },
   { STRING_COMMA_LEN ("DllEntryPoint") },
@@ -217,6 +218,9 @@  static const autofilter_entry_type autofilter_symbollist_i386[] =
   { STRING_COMMA_LEN ("_cygwin_dll_entry") },
   { STRING_COMMA_LEN ("_cygwin_crt0_common") },
   { STRING_COMMA_LEN ("_cygwin_noncygwin_dll_entry") },
+  { STRING_COMMA_LEN ("_msys_dll_entry") },
+  { STRING_COMMA_LEN ("_msys_crt0_common") },
+  { STRING_COMMA_LEN ("_msys_nonmsys_dll_entry") },
 #else
   { STRING_COMMA_LEN ("DllMain@12") },
   { STRING_COMMA_LEN ("DllEntryPoint@0") },
@@ -225,6 +229,10 @@  static const autofilter_entry_type autofilter_symbollist_i386[] =
   { STRING_COMMA_LEN ("_cygwin_crt0_common@8") },
   { STRING_COMMA_LEN ("_cygwin_noncygwin_dll_entry@12") },
   { STRING_COMMA_LEN ("cygwin_attach_dll") },
+  { STRING_COMMA_LEN ("_msys_dll_entry@12") },
+  { STRING_COMMA_LEN ("_msys_crt0_common@8") },
+  { STRING_COMMA_LEN ("_msys_nonmsys_dll_entry@12") },
+  { STRING_COMMA_LEN ("msys_attach_dll") },
 #endif
   { STRING_COMMA_LEN ("cygwin_premain0") },
   { STRING_COMMA_LEN ("cygwin_premain1") },
@@ -348,6 +356,7 @@  static const autofilter_entry_type autofilter_liblist[] =
 {
   { STRING_COMMA_LEN ("libcegcc") },
   { STRING_COMMA_LEN ("libcygwin") },
+  { STRING_COMMA_LEN ("libmsys-2.0") },
   { STRING_COMMA_LEN ("libgcc") },
   { STRING_COMMA_LEN ("libgcc_s") },
   { STRING_COMMA_LEN ("libstdc++") },
diff --git a/ld/testsuite/ld-auto-import/auto-import.exp b/ld/testsuite/ld-auto-import/auto-import.exp
index 5827df43865..7608556429c 100644
--- a/ld/testsuite/ld-auto-import/auto-import.exp
+++ b/ld/testsuite/ld-auto-import/auto-import.exp
@@ -174,3 +174,65 @@  if [istarget *-pc-cygwin] {
     	fail $msg
     }
 }
+
+if [istarget *-pc-msys] {
+    # Set some libs needed for msys.
+    set MYLIBS "-L/usr/lib -lmsys-2.0 -L/usr/lib/w32api -lkernel32"
+    
+    # Compile the dll.
+    if ![ld_compile "$CC $CFLAGS $SHCFLAG" $srcdir/$subdir/dll.c $tmpdir/dll.o] {
+	fail "compiling shared lib"
+    }
+    if ![ld_special_link "$ld -shared --enable-auto-import -e __cygwin_dll_entry@12 --out-implib=$tmpdir/libstandard.dll.a" $tmpdir/dll.dll "$tmpdir/dll.o $MYLIBS"] {
+	fail "linking shared lib"
+    }
+
+    # Create symbolic link.
+    catch "exec ln -fs dll.dll $tmpdir/libsymlinked_dll.dll.a" ln_catch
+
+    # Compile and link the client program.
+    if ![ld_compile "$CC $CFLAGS $SHCFLAG" $srcdir/$subdir/client.c $tmpdir/client.o] {
+        fail "compiling client"
+    }
+
+    # Check linking with import library.
+    set msg "linking auto-import client using a standard import library"
+    if [ld_special_link $ld $tmpdir/client-linklib.exe "--enable-auto-import --enable-runtime-pseudo-reloc /lib/crt0.o $tmpdir/client.o -L$tmpdir -lstandard $MYLIBS"] {
+	pass $msg
+    } else {
+	fail $msg 
+    }
+
+    # Check linking directly with dll.
+    set msg "linking auto-import client using the dll"
+    if [ld_special_link $ld $tmpdir/client-linkdll.exe "--enable-auto-import --enable-runtime-pseudo-reloc /lib/crt0.o $tmpdir/client.o -L$tmpdir -ldll $MYLIBS"] {
+	pass $msg
+    } else {
+	fail $msg 
+    }
+
+    # Check linking with symlinked dll.
+    set msg "linking auto-import client using symbolic linked dll"
+    if [ld_special_link $ld $tmpdir/client-symlinkeddll.exe "--enable-auto-import --enable-runtime-pseudo-reloc /lib/crt0.o $tmpdir/client.o -L$tmpdir -lsymlinked_dll $MYLIBS"] {
+	pass $msg
+    } else {
+	fail $msg 
+    }
+
+    # Check linking with disabled auto-import, this must produce linking error.
+    set msg "linking with disabled auto-import"
+    if ![ld_special_link $ld $tmpdir/client-failed.exe "--disable-auto-import --enable-runtime-pseudo-reloc /lib/crt0.o $tmpdir/client.o -L$tmpdir -ldll $MYLIBS"] {
+	pass $msg
+    } else {
+	fail $msg
+    }
+
+    # Check that the app works - ie that there is output when the applications runs.
+    set msg "application runtime segfault check" 
+    catch "exec $tmpdir/client-linklib.exe" exec_output
+    if ![string match "" $exec_output] then {
+    	pass $msg
+    } else {
+    	fail $msg
+    }
+}
diff --git a/ld/testsuite/ld-fastcall/fastcall.exp b/ld/testsuite/ld-fastcall/fastcall.exp
index 532259e1f83..c0d05b4dbd5 100644
--- a/ld/testsuite/ld-fastcall/fastcall.exp
+++ b/ld/testsuite/ld-fastcall/fastcall.exp
@@ -26,6 +26,7 @@  if {![istarget "i*86-*-*"] && ![istarget "x86_64-*-mingw*"] } {
 
 if {  !([istarget "i*86-*-*pe*"] && ![istarget "i*86-*-opensd*"]) \
     && ![istarget "i*86-*-cygwin*"] \
+    && ![istarget "i*86-*-msys*"] \
     && ![istarget "x86_64-*-mingw*"] \
     && ![istarget "i*86-*-mingw*"] } {
     return
diff --git a/ld/testsuite/ld-pe/pe-compile.exp b/ld/testsuite/ld-pe/pe-compile.exp
index ff867ce1118..1f70251795d 100644
--- a/ld/testsuite/ld-pe/pe-compile.exp
+++ b/ld/testsuite/ld-pe/pe-compile.exp
@@ -116,6 +116,7 @@  run_ver_script_test "vers-script-3"
 run_ver_script_test "vers-script-4"
 
 if {[istarget i*86-*-cygwin*]
+    || [istarget i*86-*-msys*]
     || [istarget i*86-*-pe]
     || [istarget i*86-*-mingw*]
     || [istarget x86_64-*-mingw*] } {
diff --git a/ld/testsuite/ld-pe/pe.exp b/ld/testsuite/ld-pe/pe.exp
index 6a30366ff61..365c94894d0 100644
--- a/ld/testsuite/ld-pe/pe.exp
+++ b/ld/testsuite/ld-pe/pe.exp
@@ -26,6 +26,7 @@  if {![is_pecoff_format]} {
 
 # This test can only be run on PE/COFF platforms that support .secrel32.
 if {[istarget i*86-*-cygwin*]
+    || [istarget i*86-*-msys*]
     || [istarget i*86-*-pe]
     || [istarget i*86-*-mingw*]
     || [istarget x86_64-*-mingw*]
@@ -42,7 +43,7 @@  if {[istarget i*86-*-cygwin*]
 	{"TLS directory entry" "" "" "" "tlssec.s"
 	 {{objdump -p tlssec64.d}} "tlssec.dll"}
       }
-    } elseif {[istarget i*86-*-cygwin*] } {
+    } elseif {[istarget i*86-*-cygwin*] || [istarget i*86-*-msys*] } {
       set pe_tests {
 	{".secrel32" "--disable-auto-import --disable-reloc-section" "" "" {secrel1.s secrel2.s}
 	 {{objdump -s secrel.d}} "secrel.x"}
@@ -127,7 +128,7 @@  run_ld_link_tests $pr19803_dll
 
 if {[istarget x86_64-*-mingw*] } {
 	run_dump_test "cfi"
-} elseif {[istarget i*86-*-cygwin*] || [istarget i*86-*-mingw*] } {
+} elseif {[istarget i*86-*-cygwin*] || [istarget i*86-*-msys*] || [istarget i*86-*-mingw*] } {
 	run_dump_test "cfi32"
 }
 
diff --git a/ld/testsuite/ld-pe/weakdef-1.d b/ld/testsuite/ld-pe/weakdef-1.d
index 57a85656ea5..a653170629b 100644
--- a/ld/testsuite/ld-pe/weakdef-1.d
+++ b/ld/testsuite/ld-pe/weakdef-1.d
@@ -1,5 +1,5 @@ 
 #source: weakdef-1.s
-#target: i*86-*-cygwin* i*86-*-pe i*86-*-mingw*
+#target: i*86-*-cygwin* i*86-*-msys* i*86-*-pe i*86-*-mingw*
 #ld: -e _start --gc-sections
 #objdump: -d
 
diff --git a/libctf/configure b/libctf/configure
index 3701bd8e796..3426511bcfa 100755
--- a/libctf/configure
+++ b/libctf/configure
@@ -8112,7 +8112,7 @@  else
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -8454,7 +8454,7 @@  bsdi[45]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -9070,7 +9070,7 @@  case $host_os in
 aix*)
   symcode='[BCDT]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[ABCDGISTW]'
   ;;
 hpux*)
@@ -10657,7 +10657,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -10739,7 +10739,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       lt_prog_compiler_pic='-DDLL_EXPORT'
@@ -11201,7 +11201,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -11316,7 +11316,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
       # as there is no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -11747,7 +11747,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       export_dynamic_flag_spec=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -12648,14 +12648,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -12677,6 +12677,12 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+      ;;
+    msys*)
+      # Msys DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
       ;;
     mingw* | cegcc*)
@@ -13329,7 +13335,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;
@@ -16881,6 +16887,10 @@  if test "$enable_shared" = "yes"; then
       SHARED_LDFLAGS="-no-undefined"
       CTF_LIBADD="$CTF_LIBADD -lcygwin"
       ;;
+    *-*-msys*)
+      SHARED_LDFLAGS="-no-undefined"
+      CTF_LIBADD="$CTF_LIBADD -lmsys-2.0"
+      ;;
   esac
 fi
 
diff --git a/libctf/configure.ac b/libctf/configure.ac
index e4e430615bd..ead6a24d183 100644
--- a/libctf/configure.ac
+++ b/libctf/configure.ac
@@ -229,6 +229,10 @@  if test "$enable_shared" = "yes"; then
       SHARED_LDFLAGS="-no-undefined"
       CTF_LIBADD="$CTF_LIBADD -lcygwin"
       ;;
+    *-*-msys*)
+      SHARED_LDFLAGS="-no-undefined"
+      CTF_LIBADD="$CTF_LIBADD -lmsys-2.0"
+      ;;
   esac
 fi
 AC_SUBST(SHARED_LDFLAGS)
diff --git a/libdecnumber/configure b/libdecnumber/configure
index e4600c10e55..8ecb083a560 100755
--- a/libdecnumber/configure
+++ b/libdecnumber/configure
@@ -4769,7 +4769,8 @@  else
     powerpc*-*-linux* | i?86*-*-linux* | x86_64*-*-linux* | s390*-*-linux* | \
     i?86*-*-elfiamcu | i?86*-*-gnu* | x86_64*-*-gnu* | \
     i?86*-*-mingw* | x86_64*-*-mingw* | \
-    i?86*-*-cygwin* | x86_64*-*-cygwin*)
+    i?86*-*-cygwin* | x86_64*-*-cygwin* | \
+    i?86*-*-msys* | x86_64*-*-msys*)
       enable_decimal_float=yes
       ;;
     *)
diff --git a/libiberty/configure b/libiberty/configure
index 5c69fee56c1..0b710e6035c 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -5339,6 +5339,8 @@  case "${host}" in
 	;;
     i[34567]86-*-cygwin* | x86_64-*-cygwin*)
 	;;
+    i[34567]86-*-msys* | x86_64-*-msys*)
+	;;
     i[34567]86-*-mingw* | x86_64-*-mingw*)
 	;;
     i[34567]86-*-interix[3-9]*)
@@ -6722,7 +6724,7 @@  fi
 
 
 case "${host}" in
-  *-*-cygwin* | *-*-mingw*)
+  *-*-cygwin* | *-*-msys* | *-*-mingw*)
     $as_echo "#define HAVE_SYS_ERRLIST 1" >>confdefs.h
 
     $as_echo "#define HAVE_SYS_NERR 1" >>confdefs.h
diff --git a/libiberty/configure.ac b/libiberty/configure.ac
index 0888e638896..5f5a87405be 100644
--- a/libiberty/configure.ac
+++ b/libiberty/configure.ac
@@ -582,7 +582,7 @@  AC_SUBST(CHECK)
 AC_SUBST(target_header_dir)
 
 case "${host}" in
-  *-*-cygwin* | *-*-mingw*)
+  *-*-cygwin* | *-*-msys* | *-*-mingw*)
     AC_DEFINE(HAVE_SYS_ERRLIST)
     AC_DEFINE(HAVE_SYS_NERR)
     ;;
diff --git a/libtool.m4 b/libtool.m4
index e36fdd3c0e2..8602498fc03 100644
--- a/libtool.m4
+++ b/libtool.m4
@@ -1523,7 +1523,7 @@  AC_CACHE_VAL([lt_cv_sys_max_cmd_len], [dnl
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -1765,7 +1765,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;
@@ -2236,14 +2236,14 @@  bsdi[[45]]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -2264,6 +2264,12 @@  cygwin* | mingw* | pw32* | cegcc*)
     cygwin*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[[.]]/-/g'`${versuffix}${shared_ext}'
+m4_if([$1], [],[
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"])
+      ;;
+    msys*)
+      # Msys DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[[.]]/-/g'`${versuffix}${shared_ext}'
 m4_if([$1], [],[
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"])
       ;;
@@ -3047,7 +3053,7 @@  bsdi[[45]]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -3344,7 +3350,7 @@  AC_DEFUN([LT_LIB_M],
 [AC_REQUIRE([AC_CANONICAL_HOST])dnl
 LIBM=
 case $host in
-*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
+*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-msys* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
   # These system don't have libm, or don't need it
   ;;
 *-ncr-sysv4.3*)
@@ -3419,7 +3425,7 @@  case $host_os in
 aix*)
   symcode='[[BCDT]]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[[ABCDGISTW]]'
   ;;
 hpux*)
@@ -3666,7 +3672,7 @@  m4_if([$1], [CXX], [
     beos* | irix5* | irix6* | nonstopux* | osf3* | osf4* | osf5*)
       # PIC is the default for these OSes.
       ;;
-    mingw* | cygwin* | os2* | pw32* | cegcc*)
+    mingw* | cygwin* | msys* | os2* | pw32* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -3979,7 +3985,7 @@  m4_if([$1], [CXX], [
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -4062,7 +4068,7 @@  m4_if([$1], [CXX], [
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       m4_if([$1], [GCJ], [],
@@ -4295,7 +4301,7 @@  m4_if([$1], [CXX], [
   pw32*)
     _LT_TAGVAR(export_symbols_cmds, $1)="$ltdll_cmds"
   ;;
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     _LT_TAGVAR(export_symbols_cmds, $1)='$NM $libobjs $convenience | $global_symbol_pipe | $SED -e '\''/^[[BCDGRS]][[ ]]/s/.*[[ ]]\([[^ ]]*\)/\1 DATA/;/^.*[[ ]]__nm__/s/^.*[[ ]]__nm__\([[^ ]]*\)[[ ]][[^ ]]*/\1 DATA/;/^I[[ ]]/d;/^[[AITW]][[ ]]/s/.* //'\'' | sort | uniq > $export_symbols'
   ;;
   *)
@@ -4347,7 +4353,7 @@  dnl Note also adjust exclude_expsyms for C++ above.
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -4462,7 +4468,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, $1) is actually meaningless,
       # as there is no search path for DLLs.
       _LT_TAGVAR(hardcode_libdir_flag_spec, $1)='-L$libdir'
@@ -4835,7 +4841,7 @@  _LT_EOF
       _LT_TAGVAR(export_dynamic_flag_spec, $1)=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -5779,7 +5785,7 @@  if test "$_lt_caught_CXX_error" != yes; then
         esac
         ;;
 
-      cygwin* | mingw* | pw32* | cegcc*)
+      cygwin* | msys* | mingw* | pw32* | cegcc*)
         # _LT_TAGVAR(hardcode_libdir_flag_spec, $1) is actually meaningless,
         # as there is no search path for DLLs.
         _LT_TAGVAR(hardcode_libdir_flag_spec, $1)='-L$libdir'
diff --git a/ltmain.sh b/ltmain.sh
index 70990740b6c..e8161587051 100644
--- a/ltmain.sh
+++ b/ltmain.sh
@@ -976,7 +976,7 @@  func_enable_tag ()
 
 
   case $host in
-    *cygwin* | *mingw* | *pw32* | *cegcc* | *solaris2* )
+    *cygwin* | *msys* | *mingw* | *pw32* | *cegcc* | *solaris2* )
       # don't eliminate duplications in $postdeps and $predeps
       opt_duplicate_compiler_generated_deps=:
       ;;
@@ -1453,7 +1453,7 @@  func_mode_compile ()
 
     # On Cygwin there's no "real" PIC flag so we must build both object types
     case $host_os in
-    cygwin* | mingw* | pw32* | os2* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | os2* | cegcc*)
       pic_mode=default
       ;;
     esac
@@ -2279,7 +2279,7 @@  func_mode_install ()
 	      'exit $?'
 	  tstripme="$stripme"
 	  case $host_os in
-	  cygwin* | mingw* | pw32* | cegcc*)
+	  cygwin* | msys* | mingw* | pw32* | cegcc*)
 	    case $realname in
 	    *.dll.a)
 	      tstripme=""
@@ -2385,7 +2385,7 @@  func_mode_install ()
 
 	# Do a test to see if this is really a libtool program.
 	case $host in
-	*cygwin* | *mingw*)
+	*cygwin* | *msys* | *mingw*)
 	    if func_ltwrapper_executable_p "$file"; then
 	      func_ltwrapper_scriptname "$file"
 	      wrapper=$func_ltwrapper_scriptname_result
@@ -2460,7 +2460,7 @@  func_mode_install ()
 	# remove .exe since cygwin /usr/bin/install will append another
 	# one anyway
 	case $install_prog,$host in
-	*/usr/bin/install*,*cygwin*)
+	*/usr/bin/install*,*cygwin*|*/usr/bin/install*,*msys*)
 	  case $file:$destfile in
 	  *.exe:*.exe)
 	    # this is ok
@@ -2595,7 +2595,7 @@  extern \"C\" {
 	      $RM $export_symbols
 	      ${SED} -n -e '/^: @PROGRAM@ $/d' -e 's/^.* \(.*\)$/\1/p' < "$nlist" > "$export_symbols"
 	      case $host in
-	      *cygwin* | *mingw* | *cegcc* )
+	      *cygwin* | *msys* | *mingw* | *cegcc* )
                 echo EXPORTS > "$output_objdir/$outputname.def"
                 cat "$export_symbols" >> "$output_objdir/$outputname.def"
 	        ;;
@@ -2607,7 +2607,7 @@  extern \"C\" {
 	      $GREP -f "$output_objdir/$outputname.exp" < "$nlist" > "$nlist"T
 	      $MV "$nlist"T "$nlist"
 	      case $host in
-	        *cygwin* | *mingw* | *cegcc* )
+	        *cygwin* | *msys* | *mingw* | *cegcc* )
 	          echo EXPORTS > "$output_objdir/$outputname.def"
 	          cat "$nlist" >> "$output_objdir/$outputname.def"
 	          ;;
@@ -2663,7 +2663,7 @@  typedef struct {
 } lt_dlsymlist;
 "
 	  case $host in
-	  *cygwin* | *mingw* | *cegcc* )
+	  *cygwin* | *msys* | *mingw* | *cegcc* )
 	    echo >> "$output_objdir/$my_dlsyms" "\
 /* DATA imports from DLLs on WIN32 con't be const, because
    runtime relocations are performed -- see ld's documentation
@@ -2749,7 +2749,7 @@  static const void *lt_preloaded_setup() {
 	# Transform the symbol file into the correct name.
 	symfileobj="$output_objdir/${my_outputname}S.$objext"
 	case $host in
-	*cygwin* | *mingw* | *cegcc* )
+	*cygwin* | *msys* | *mingw* | *cegcc* )
 	  if test -f "$output_objdir/$my_outputname.def"; then
 	    compile_command=`$ECHO "$compile_command" | $SED "s%@SYMFILE@%$output_objdir/$my_outputname.def $symfileobj%"`
 	    finalize_command=`$ECHO "$finalize_command" | $SED "s%@SYMFILE@%$output_objdir/$my_outputname.def $symfileobj%"`
@@ -3192,7 +3192,7 @@  func_to_host_path ()
             func_to_host_path_result=`( cmd //c echo "$1" ) 2>/dev/null |
               $SED -e 's/[ ]*$//' -e "$lt_sed_naive_backslashify"`
             ;;
-          *cygwin* )
+          *cygwin* | *msys* )
             func_to_host_path_result=`cygpath -w "$1" |
 	      $SED -e "$lt_sed_naive_backslashify"`
             ;;
@@ -3265,7 +3265,7 @@  func_to_host_pathlist ()
 	      ( cmd //c echo "$func_to_host_pathlist_tmp1" ) 2>/dev/null |
 	      $SED -e 's/[ ]*$//' -e "$lt_sed_naive_backslashify"`
             ;;
-          *cygwin* )
+          *cygwin* | *msys* )
             func_to_host_pathlist_result=`cygpath -w -p "$func_to_host_pathlist_tmp1" |
               $SED -e "$lt_sed_naive_backslashify"`
             ;;
@@ -3571,7 +3571,7 @@  main (int argc, char *argv[])
 	{
 EOF
 	    case "$host" in
-	      *mingw* | *cygwin* )
+	      *mingw* | *cygwin* | *msys* )
 		# make stdout use "unix" line endings
 		echo "          setmode(1,_O_BINARY);"
 		;;
@@ -4233,7 +4233,7 @@  func_mode_link ()
 {
     $opt_debug
     case $host in
-    *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
+    *-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
       # It is impossible to link a dll without this setting, and
       # we shouldn't force the makefile maintainer to figure out
       # which system we are compiling for in order to pass an extra
@@ -4713,7 +4713,7 @@  func_mode_link ()
 	  ;;
 	esac
 	case $host in
-	*-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
+	*-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
 	  testbindir=`$ECHO "$dir" | $SED 's*/lib$*/bin*'`
 	  case :$dllsearchpath: in
 	  *":$dir:"*) ;;
@@ -4733,7 +4733,7 @@  func_mode_link ()
       -l*)
 	if test "X$arg" = "X-lc" || test "X$arg" = "X-lm"; then
 	  case $host in
-	  *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-beos* | *-cegcc* | *-*-haiku*)
+	  *-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-beos* | *-cegcc* | *-*-haiku*)
 	    # These systems don't actually have a C or math library (as such)
 	    continue
 	    ;;
@@ -4813,7 +4813,7 @@  func_mode_link ()
 
       -no-install)
 	case $host in
-	*-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-*-darwin* | *-cegcc*)
+	*-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-*-darwin* | *-cegcc*)
 	  # The PATH hackery in wrapper scripts is required on Windows
 	  # and Darwin in order for the loader to find any dlls it needs.
 	  func_warning "\`-no-install' is ignored for $host"
@@ -5772,7 +5772,7 @@  func_mode_link ()
 	if test -n "$library_names" &&
 	   { test "$use_static_libs" = no || test -z "$old_library"; }; then
 	  case $host in
-	  *cygwin* | *mingw* | *cegcc*)
+	  *cygwin* | *msys* | *mingw* | *cegcc*)
 	      # No point in relinking DLLs because paths are not encoded
 	      notinst_deplibs="$notinst_deplibs $lib"
 	      need_relink=no
@@ -5842,7 +5842,7 @@  func_mode_link ()
 	    elif test -n "$soname_spec"; then
 	      # bleh windows
 	      case $host in
-	      *cygwin* | mingw* | *cegcc*)
+	      *cygwin* | *msys* | mingw* | *cegcc*)
 	        func_arith $current - $age
 		major=$func_arith_result
 		versuffix="-$major"
@@ -6693,7 +6693,7 @@  func_mode_link ()
       if test "$build_libtool_libs" = yes; then
 	if test -n "$rpath"; then
 	  case $host in
-	  *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-*-beos* | *-cegcc* | *-*-haiku*)
+	  *-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-*-beos* | *-cegcc* | *-*-haiku*)
 	    # these systems don't actually have a c library (as such)!
 	    ;;
 	  *-*-rhapsody* | *-*-darwin1.[012])
@@ -7194,7 +7194,7 @@  EOF
 
 	orig_export_symbols=
 	case $host_os in
-	cygwin* | mingw* | cegcc*)
+	cygwin* | msys* | mingw* | cegcc*)
 	  if test -n "$export_symbols" && test -z "$export_symbols_regex"; then
 	    # exporting using user supplied symfile
 	    if test "x`$SED 1q $export_symbols`" != xEXPORTS; then
@@ -7710,7 +7710,7 @@  EOF
 
     prog)
       case $host in
-	*cygwin*) func_stripname '' '.exe' "$output"
+	*cygwin* | *msys*) func_stripname '' '.exe' "$output"
 	          output=$func_stripname_result.exe;;
       esac
       test -n "$vinfo" && \
@@ -7823,7 +7823,7 @@  EOF
 	  esac
 	fi
 	case $host in
-	*-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
+	*-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
 	  testbindir=`${ECHO} "$libdir" | ${SED} -e 's*/lib$*/bin*'`
 	  case :$dllsearchpath: in
 	  *":$libdir:"*) ;;
@@ -7901,7 +7901,7 @@  EOF
         # Disable wrappers for cegcc and mingw32ce hosts, we are cross compiling anyway.
         wrappers_required=no
         ;;
-      *cygwin* | *mingw* )
+      *cygwin* | *msys* | *mingw* )
         if test "$build_libtool_libs" != yes; then
           wrappers_required=no
         fi
@@ -8029,14 +8029,14 @@  EOF
 	esac
 	# test for cygwin because mv fails w/o .exe extensions
 	case $host in
-	  *cygwin*)
+	  *cygwin* | *msys*)
 	    exeext=.exe
 	    func_stripname '' '.exe' "$outputname"
 	    outputname=$func_stripname_result ;;
 	  *) exeext= ;;
 	esac
 	case $host in
-	  *cygwin* | *mingw* )
+	  *cygwin* | *msys* | *mingw* )
 	    func_dirname_and_basename "$output" "" "."
 	    output_name=$func_basename_result
 	    output_path=$func_dirname_result
@@ -8343,7 +8343,7 @@  EOF
 	  # tests/bindir.at for full details.
 	  tdlname=$dlname
 	  case $host,$output,$installed,$module,$dlname in
-	    *cygwin*,*lai,yes,no,*.dll | *mingw*,*lai,yes,no,*.dll | *cegcc*,*lai,yes,no,*.dll)
+	    *cygwin*,*lai,yes,no,*.dll | *msys*,*lai,yes,no,*.dll | *mingw*,*lai,yes,no,*.dll | *cegcc*,*lai,yes,no,*.dll)
 	      # If a -bindir argument was supplied, place the dll there.
 	      if test "x$bindir" != x ;
 	      then
diff --git a/ltoptions.m4 b/ltoptions.m4
index 5ef12ced2a8..5e7bc34702b 100644
--- a/ltoptions.m4
+++ b/ltoptions.m4
@@ -126,7 +126,7 @@  LT_OPTION_DEFINE([LT_INIT], [win32-dll],
 [enable_win32_dll=yes
 
 case $host in
-*-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-cegcc*)
+*-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-cegcc*)
   AC_CHECK_TOOL(AS, as, false)
   AC_CHECK_TOOL(DLLTOOL, dlltool, false)
   AC_CHECK_TOOL(OBJDUMP, objdump, false)
diff --git a/opcodes/configure b/opcodes/configure
index 9b3cc5ce4a1..e70d76d12f1 100755
--- a/opcodes/configure
+++ b/opcodes/configure
@@ -5608,7 +5608,7 @@  else
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -5950,7 +5950,7 @@  bsdi[45]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -6566,7 +6566,7 @@  case $host_os in
 aix*)
   symcode='[BCDT]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[ABCDGISTW]'
   ;;
 hpux*)
@@ -8153,7 +8153,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -8235,7 +8235,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       lt_prog_compiler_pic='-DDLL_EXPORT'
@@ -8697,7 +8697,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -8812,7 +8812,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
       # as there is no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -9243,7 +9243,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       export_dynamic_flag_spec=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -10144,14 +10144,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -10173,6 +10173,12 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+      ;;
+    msys*)
+      # Msys DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
       ;;
     mingw* | cegcc*)
@@ -10825,7 +10831,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;
@@ -14207,7 +14213,7 @@  $as_echo "$bfd_cv_ld_as_needed" >&6; }
 
 LIBM=
 case $host in
-*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
+*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-msys* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
   # These system don't have libm, or don't need it
   ;;
 *-ncr-sysv4.3*)
@@ -14383,6 +14389,10 @@  if test "$enable_shared" = "yes"; then
       SHARED_LDFLAGS="-no-undefined"
       SHARED_LIBADD="-L`pwd`/../bfd -lbfd -L`pwd`/../libiberty -liberty $SHARED_LIBADD"
       ;;
+    *-*-msys*)
+      SHARED_LDFLAGS="-no-undefined"
+      SHARED_LIBADD="-L`pwd`/../bfd -lbfd -L`pwd`/../libiberty -liberty -L`pwd`/../intl -lintl -lmsys-2.0"
+      ;;
     *)
       SHARED_LIBADD="../bfd/libbfd.la ${SHARED_LIBADD}"
       SHARED_DEPENDENCIES="../bfd/libbfd.la"
diff --git a/opcodes/configure.ac b/opcodes/configure.ac
index d812ff54a95..2c6843e7bff 100644
--- a/opcodes/configure.ac
+++ b/opcodes/configure.ac
@@ -198,6 +198,10 @@  if test "$enable_shared" = "yes"; then
       SHARED_LDFLAGS="-no-undefined"
       SHARED_LIBADD="-L`pwd`/../bfd -lbfd -L`pwd`/../libiberty -liberty $SHARED_LIBADD"
       ;;
+    *-*-msys*)
+      SHARED_LDFLAGS="-no-undefined"
+      SHARED_LIBADD="-L`pwd`/../bfd -lbfd -L`pwd`/../libiberty -liberty $SHARED_LIBADD"
+      ;;
     *)
       SHARED_LIBADD="../bfd/libbfd.la ${SHARED_LIBADD}"
       SHARED_DEPENDENCIES="../bfd/libbfd.la"
diff --git a/readline/readline/configure b/readline/readline/configure
index 6ea4545e26f..2aec06a0d99 100755
--- a/readline/readline/configure
+++ b/readline/readline/configure
@@ -2615,7 +2615,7 @@  fi
 CROSS_COMPILE=
 if test "x$cross_compiling" = "xyes"; then
     case "${host}" in
-    *-cygwin*)
+    *-cygwin* | *-msys*)
         cross_cache=${srcdir}/cross-build/cygwin.cache
         ;;
     *-mingw*)
diff --git a/readline/readline/configure.ac b/readline/readline/configure.ac
index 912c99b6575..4e9ee84b7a4 100644
--- a/readline/readline/configure.ac
+++ b/readline/readline/configure.ac
@@ -85,7 +85,7 @@  dnl build machine.
 CROSS_COMPILE=
 if test "x$cross_compiling" = "xyes"; then
     case "${host}" in
-    *-cygwin*)
+    *-cygwin* | *-msys*)
         cross_cache=${srcdir}/cross-build/cygwin.cache
         ;;
     *-mingw*)
diff --git a/readline/readline/support/config.guess b/readline/readline/support/config.guess
index cc7a8107011..85c30845c7c 100755
--- a/readline/readline/support/config.guess
+++ b/readline/readline/support/config.guess
@@ -918,6 +918,9 @@  EOF
     amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*)
 	echo x86_64-pc-cygwin
 	exit ;;
+    amd64:MSYS*:*:* | x86_64:MSYS*:*:*)
+	echo x86_64-pc-msys
+	exit ;;
     prep*:SunOS:5.*:*)
 	echo powerpcle-unknown-solaris2"$(echo "$UNAME_RELEASE"|sed -e 's/[^.]*//')"
 	exit ;;
diff --git a/readline/readline/support/config.rpath b/readline/readline/support/config.rpath
index fc5913d7878..54df9203647 100755
--- a/readline/readline/support/config.rpath
+++ b/readline/readline/support/config.rpath
@@ -57,7 +57,7 @@  else
     aix*)
       wl='-Wl,'
       ;;
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       ;;
     hpux9* | hpux10* | hpux11*)
       wl='-Wl,'
@@ -149,7 +149,7 @@  hardcode_direct=no
 hardcode_minus_L=no
 
 case "$host_os" in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -198,7 +198,7 @@  if test "$with_gnu_ld" = yes; then
         ld_shlibs=no
       fi
       ;;
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # hardcode_libdir_flag_spec is actually meaningless, as there is
       # no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -348,7 +348,7 @@  else
       ;;
     bsdi[45]*)
       ;;
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -533,7 +533,7 @@  case "$host_os" in
   bsdi[45]*)
     library_names_spec='$libname$shrext'
     ;;
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     shrext=.dll
     library_names_spec='$libname.dll.a $libname.lib'
     ;;
diff --git a/readline/readline/support/shlib-install b/readline/readline/support/shlib-install
index 661355d32b2..39d0fddb96e 100755
--- a/readline/readline/support/shlib-install
+++ b/readline/readline/support/shlib-install
@@ -75,7 +75,7 @@  hpux*|darwin*|macosx*|linux*|solaris2*)
 	if [ -z "$uninstall" ]; then
 		chmod 755 ${INSTALLDIR}/${LIBNAME}
 	fi ;;
-cygwin*|mingw*)
+cygwin*|msys*|mingw*)
 	IMPLIBNAME=`echo ${LIBNAME} \
 		| sed -e 's,^cyg,lib,' -e 's,[0-9]*.dll$,.dll.a,'`
 	if [ -z "$uninstall" ]; then
@@ -162,7 +162,7 @@  hpux1*)
 	fi
 	;;
 
-cygwin*|mingw*)
+cygwin*|msys*|mingw*)
 	# Links to .dlls don't work.  Hence shobj-conf used DLLVERSION.dll
 	# instead of so.SHLIB_MAJOR.SHLIB_MINOR.  The postinstall above
 	# took care of everything else.
diff --git a/readline/readline/support/shobj-conf b/readline/readline/support/shobj-conf
index 5a3f9776e91..595e92384f2 100755
--- a/readline/readline/support/shobj-conf
+++ b/readline/readline/support/shobj-conf
@@ -494,6 +494,24 @@  cygwin*)
 	fi
 	;;
 
+msys*)
+	SHOBJ_LD='$(CC)'
+	SHOBJ_LDFLAGS='-shared -Wl,--enable-auto-import -Wl,--enable-auto-image-base -Wl,--export-all -Wl,--out-implib=$(@).a'
+	SHLIB_LIBPREF='msys-'
+	SHLIB_LIBSUFF='dll'
+	SHLIB_LIBVERSION='$(SHLIB_DLLVERSION).$(SHLIB_LIBSUFF)'
+	SHLIB_LIBS='$(TERMCAP_LIB)'
+
+	SHLIB_DOT=
+	# For official cygwin releases, DLLVERSION will be defined in the
+	# environment of configure, and will be incremented any time the API
+	# changes in a non-backwards compatible manner.  Otherwise, it is just
+	# SHLIB_MAJOR.
+	if [ -n "$DLLVERSION" ] ; then
+		SHLIB_DLLVERSION="$DLLVERSION"
+	fi
+	;;
+
 mingw*)
 	SHOBJ_LD='$(CC)'
 	SHOBJ_LDFLAGS='-shared -Wl,--enable-auto-import -Wl,--enable-auto-image-base -Wl,--export-all -Wl,--out-implib=$(@).a'
diff --git a/sim/configure b/sim/configure
index 1ebef377973..cdb71136bc1 100755
--- a/sim/configure
+++ b/sim/configure
@@ -6347,7 +6347,7 @@  else
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -6689,7 +6689,7 @@  bsdi[45]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -7347,7 +7347,7 @@  case $host_os in
 aix*)
   symcode='[BCDT]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[ABCDGISTW]'
   ;;
 hpux*)
@@ -9953,7 +9953,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -10035,7 +10035,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       lt_prog_compiler_pic='-DDLL_EXPORT'
@@ -10497,7 +10497,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -10612,7 +10612,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
       # as there is no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -11043,7 +11043,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       export_dynamic_flag_spec=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -11944,14 +11944,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -11973,6 +11973,12 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+      ;;
+    msys*)
+      # Msys DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
       ;;
     mingw* | cegcc*)
@@ -12625,7 +12631,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;
diff --git a/zlib/configure b/zlib/configure
index 2d551360683..705b179bf8c 100755
--- a/zlib/configure
+++ b/zlib/configure
@@ -4931,7 +4931,7 @@  else
     lt_cv_sys_max_cmd_len=-1;
     ;;
 
-  cygwin* | mingw* | cegcc*)
+  cygwin* | msys* | mingw* | cegcc*)
     # On Win9x/ME, this test blows up -- it succeeds, but takes
     # about 5 minutes as the teststring grows exponentially.
     # Worse, since 9x/ME are not pre-emptively multitasking,
@@ -5273,7 +5273,7 @@  bsdi[45]*)
   lt_cv_file_magic_test_file=/shlib/libc.so
   ;;
 
-cygwin*)
+cygwin* | msys*)
   # func_win32_libid is a shell function defined in ltmain.sh
   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
   lt_cv_file_magic_cmd='func_win32_libid'
@@ -5889,7 +5889,7 @@  case $host_os in
 aix*)
   symcode='[BCDT]'
   ;;
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   symcode='[ABCDGISTW]'
   ;;
 hpux*)
@@ -7780,7 +7780,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       # PIC is the default for these OSes.
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       # Although the cygwin gcc ignores -fPIC, still need this for old-style
@@ -7862,7 +7862,7 @@  $as_echo_n "checking for $compiler option to produce PIC... " >&6; }
       fi
       ;;
 
-    mingw* | cygwin* | pw32* | os2* | cegcc*)
+    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
       # This hack is so that the source file can tell whether it is being
       # built for inclusion in a dll (and should export symbols for example).
       lt_prog_compiler_pic='-DDLL_EXPORT'
@@ -8324,7 +8324,7 @@  $as_echo_n "checking whether the $compiler linker ($LD) supports shared librarie
   extract_expsyms_cmds=
 
   case $host_os in
-  cygwin* | mingw* | pw32* | cegcc*)
+  cygwin* | msys* | mingw* | pw32* | cegcc*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -8439,7 +8439,7 @@  _LT_EOF
       fi
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
       # as there is no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -8876,7 +8876,7 @@  if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
       export_dynamic_flag_spec=-rdynamic
       ;;
 
-    cygwin* | mingw* | pw32* | cegcc*)
+    cygwin* | msys* | mingw* | pw32* | cegcc*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -9780,14 +9780,14 @@  bsdi[45]*)
   # libtool to hard-code these into programs
   ;;
 
-cygwin* | mingw* | pw32* | cegcc*)
+cygwin* | msys* | mingw* | pw32* | cegcc*)
   version_type=windows
   shrext_cmds=".dll"
   need_version=no
   need_lib_prefix=no
 
   case $GCC,$host_os in
-  yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
+  yes,cygwin* | yes,msys* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
     postinstall_cmds='base_file=`basename \${file}`~
@@ -9809,6 +9809,12 @@  cygwin* | mingw* | pw32* | cegcc*)
       # Cygwin DLLs use 'cyg' prefix rather than 'lib'
       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
 
+      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+      ;;
+    msys*)
+      # Msys DLLs use 'msys-' prefix rather than 'lib'
+      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+
       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
       ;;
     mingw* | cegcc*)
@@ -10464,7 +10470,7 @@  else
     lt_cv_dlopen_libs=
     ;;
 
-  cygwin*)
+  cygwin* | msys*)
     lt_cv_dlopen="dlopen"
     lt_cv_dlopen_libs=
     ;;