I cannot build a osmesa lib on Msys2 for later use with MSVC 2012.



1. Installed Msys2 64 bit on Windows7 64 as described in

http://sourceforge.net/p/msys2/wiki/MSYS2%20installation/



2. Added compiler toolchain in msys2:

pacman -S base-devel
pacman -S mingw-w64-x86_64-toolchain

$ gcc -v
Using built-in specs.
COLLECT_GCC=C:\msys64\mingw64\bin\gcc.exe
COLLECT_LTO_WRAPPER=C:/msys64/mingw64/lib/gcc/x86_64-w64-mingw32/4.9.2/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../gcc-4.9.2/configure --prefix=/mingw64 --with-local-prefix=/mingw64/local --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --with-native-system-header-dir=/mingw64/x86_64-w64-mingw32/include --libexecdir=/mingw64/lib --with-gxx-include-dir=/mingw64/include/c++/4.9.2 --enable-bootstrap --with-arch=x86-64 --with-tune=generic --enable-languages=c,lto,c++,objc,obj-c++,fortran,ada --enable-shared --enable-static --enable-libatomic --enable-threads=posix --enable-graphite --enable-fully-dynamic-string --enable-libstdcxx-time=yes --disable-libstdcxx-pch --disable-libstdcxx-debug --enable-cloog-backend=isl --enable-version-specific-runtime-libs --disable-cloog-version-check --disable-isl-version-check --enable-lto --enable-libgomp --disable-multilib --enable-checking=release --disable-rpath --disable-win32-registry --disable-nls --disable-werror --disable-symvers --with-libiconv --with-system-zlib --with-gmp=/mingw64 --with-mpfr=/mingw64 --with-mpc=/mingw64 --with-isl=/mingw64 --with-cloog=/mingw64 --with-pkgversion='Rev2, Built by MSYS2 project' --with-bugurl=http://sourceforge.net/projects/msys2 --with-gnu-as --with-gnu-ld
Thread model: posix
gcc version 4.9.2 (Rev2, Built by MSYS2 project)



3. configure Mesa (10.3.7 or 10.4.2)
 ./autogen.sh --disable-xvmc --disable-glx --disable-dri --with-dri-drivers="" --with-gallium-drivers="" --enable-texture-float --enable-shared-glapi --disable-egl --with-egl-platforms="" --enable-osmesa --enable-shared


....

        prefix:          /usr/local
        exec_prefix:     ${prefix}
        libdir:          ${exec_prefix}/lib
        includedir:      ${prefix}/include

        OpenGL:          yes (ES1: no ES2: no)
        OpenVG:          no

        OSMesa:          libOSMesa

        GLX:             no

        EGL:             no

        llvm:            no

        Gallium:         no

        Shared libs:     yes
        Static libs:     no
        Shared-glapi:    yes

        CFLAGS:          -g -O2 -Wall -std=c99 -Werror=implicit-function-declaration -Werror=missing-prototypes -fno-strict-aliasing -fno-builtin-memcmp
        CXXFLAGS:        -g -O2 -Wall -fno-strict-aliasing -fno-builtin-memcmp
        Macros:          -DUSE_EXTERNAL_DXTN_LIB=1 -DUSE_SSE41 -DTEXTURE_FLOAT_ENABLED -DMESA_EGL_NO_X11_HEADERS

        PYTHON2:         python2

        Run 'make' to build Mesa


4. Run make

$ make
Making all in src
make[1]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src“ wird betreten
Making all in gtest
make[2]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/gtest“ wird betreten
make[2]: Für das Ziel „all“ ist nichts zu tun.
make[2]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/gtest“ wird verlassen
Making all in util
make[2]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/util“ wird betreten
  GEN      format_srgb.c
make  all-recursive
make[3]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/util“ wird betreten
Making all in .
make[4]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/util“ wird betreten
  CC       libmesautil_la-hash_table.lo
  CC       libmesautil_la-ralloc.lo
  CC       libmesautil_la-format_srgb.lo
  CCLD     libmesautil.la
make[4]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/util“ wird verlassen
Making all in tests/hash_table
make[4]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/util/tests/hash_table“ wird betreten
make[4]: Für das Ziel „all“ ist nichts zu tun.
make[4]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/util/tests/hash_table“ wird verlassen
make[3]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/util“ wird verlassen
make[2]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/util“ wird verlassen
Making all in mapi
make[2]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/mapi“ wird betreten
  GEN      shared-glapi/glapi_mapi_tmp.h
make  all-recursive
make[3]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/mapi“ wird betreten
Making all in glapi/gen
make[4]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/mapi/glapi/gen“ wird betreten
make  all-am
make[5]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/mapi/glapi/gen“ wird betreten
make[5]: Für das Ziel „all-am“ ist nichts zu tun.
make[5]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/mapi/glapi/gen“ wird verlassen
make[4]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/mapi/glapi/gen“ wird verlassen
Making all in .
make[4]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/mapi“ wird betreten
  CC       shared_glapi_libglapi_la-entry.lo
In file included from ../../src/mapi/entry.c:29:0:
../../src/mapi/u_current.h:20:38: warning: '_glapi_get_dispatch' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 #define u_current_get_table_internal _glapi_get_dispatch
                                      ^
../../src/mapi/u_current.h:58:1: note: in expansion of macro 'u_current_get_table_internal'
 u_current_get_table_internal(void);
 ^
../../src/mapi/u_current.h:21:40: warning: '_glapi_get_context' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 #define u_current_get_context_internal _glapi_get_context
                                        ^
../../src/mapi/u_current.h:64:1: note: in expansion of macro 'u_current_get_context_internal'
 u_current_get_context_internal(void);
 ^
  CC       shared_glapi_libglapi_la-mapi_glapi.lo
In file included from ../../src/mapi/mapi_glapi.c:31:0:
../../src/mapi/u_current.h:20:38: warning: '_glapi_get_dispatch' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 #define u_current_get_table_internal _glapi_get_dispatch
                                      ^
../../src/mapi/u_current.h:58:1: note: in expansion of macro 'u_current_get_table_internal'
 u_current_get_table_internal(void);
 ^
../../src/mapi/u_current.h:21:40: warning: '_glapi_get_context' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 #define u_current_get_context_internal _glapi_get_context
                                        ^
../../src/mapi/u_current.h:64:1: note: in expansion of macro 'u_current_get_context_internal'
 u_current_get_context_internal(void);
 ^
../../src/mapi/mapi_glapi.c:53:1: warning: '_glapi_check_multithread' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glapi_check_multithread(void)
 ^
../../src/mapi/mapi_glapi.c:59:1: warning: '_glapi_set_context' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glapi_set_context(void *context)
 ^
../../src/mapi/mapi_glapi.c:65:1: warning: '_glapi_set_dispatch' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glapi_set_dispatch(struct _glapi_table *dispatch)
 ^
../../src/mapi/mapi_glapi.c:75:1: warning: '_glapi_get_dispatch_table_size' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glapi_get_dispatch_table_size(void)
 ^
../../src/mapi/mapi_glapi.c:116:1: warning: '_glapi_add_dispatch' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glapi_add_dispatch( const char * const * function_names,
 ^
../../src/mapi/mapi_glapi.c:196:1: warning: '_glapi_get_proc_offset' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glapi_get_proc_offset(const char *funcName)
 ^
../../src/mapi/mapi_glapi.c:208:1: warning: '_glapi_get_proc_address' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glapi_get_proc_address(const char *funcName)
 ^
../../src/mapi/mapi_glapi.c:219:1: warning: '_glapi_get_proc_name' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glapi_get_proc_name(unsigned int offset)
 ^
../../src/mapi/mapi_glapi.c:230:1: warning: '_glthread_GetID' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glthread_GetID(void)
 ^
../../src/mapi/mapi_glapi.c:236:1: warning: '_glapi_noop_enable_warnings' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glapi_noop_enable_warnings(unsigned char enable)
 ^
../../src/mapi/mapi_glapi.c:241:1: warning: '_glapi_set_warning_func' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 _glapi_set_warning_func(_glapi_proc func)
 ^
  CC       shared_glapi_libglapi_la-stub.lo
In file included from ../../src/mapi/stub.c:32:0:
../../src/mapi/u_current.h:20:38: warning: '_glapi_get_dispatch' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 #define u_current_get_table_internal _glapi_get_dispatch
                                      ^
../../src/mapi/u_current.h:58:1: note: in expansion of macro 'u_current_get_table_internal'
 u_current_get_table_internal(void);
 ^
../../src/mapi/u_current.h:21:40: warning: '_glapi_get_context' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 #define u_current_get_context_internal _glapi_get_context
                                        ^
../../src/mapi/u_current.h:64:1: note: in expansion of macro 'u_current_get_context_internal'
 u_current_get_context_internal(void);
 ^
../../src/mapi/stub.c: In function 'stub_compare':
../../src/mapi/stub.c:76:36: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
    stub_name = &public_string_pool[(unsigned long) stub->name];
                                    ^
../../src/mapi/stub.c: In function 'stub_get_name':
../../src/mapi/stub.c:204:34: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
       name = &public_string_pool[(unsigned long) stub->name];
                                  ^
  CC       shared_glapi_libglapi_la-table.lo
  CC       shared_glapi_libglapi_la-u_current.lo
In file included from ../../src/mapi/u_current.c:51:0:
../../src/mapi/u_current.h:20:38: warning: '_glapi_get_dispatch' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 #define u_current_get_table_internal _glapi_get_dispatch
                                      ^
../../src/mapi/u_current.h:58:1: note: in expansion of macro 'u_current_get_table_internal'
 u_current_get_table_internal(void);
 ^
../../src/mapi/u_current.h:21:40: warning: '_glapi_get_context' redeclared without dllimport attribute: previous dllimport ignored [-Wattributes]
 #define u_current_get_context_internal _glapi_get_context
                                        ^
../../src/mapi/u_current.h:64:1: note: in expansion of macro 'u_current_get_context_internal'
 u_current_get_context_internal(void);
 ^
../../src/mapi/u_current.h:16:25: warning: '_glapi_Dispatch' redeclared without dllimport attribute after being referenced with dll linkage
 #define u_current_table _glapi_Dispatch
                         ^
../../src/mapi/u_current.c:111:20: note: in expansion of macro 'u_current_table'
 struct mapi_table *u_current_table =
                    ^
../../src/mapi/u_current.h:17:27: warning: '_glapi_Context' redeclared without dllimport attribute after being referenced with dll linkage
 #define u_current_context _glapi_Context
                           ^
../../src/mapi/u_current.c:113:7: note: in expansion of macro 'u_current_context'
 void *u_current_context;
       ^
  CC       shared_glapi_libglapi_la-u_execmem.lo
  CCLD     shared-glapi/libglapi.la
.libs/shared_glapi_libglapi_la-entry.o: In function `u_current_get_table':
C:\msys64\home\animator\mesa\Mesa-10.3.7\src\mapi/../../src/mapi/u_current.h:72: undefined reference to `__imp__glapi_Dispatch'
C:\msys64\home\animator\mesa\Mesa-10.3.7\src\mapi/../../src/mapi/u_current.h:72: undefined reference to `__imp__glapi_Dispatch'
C:\msys64\home\animator\mesa\Mesa-10.3.7\src\mapi/../../src/mapi/u_current.h:72: undefined reference to `__imp__glapi_Dispatch'
C:\msys64\home\animator\mesa\Mesa-10.3.7\src\mapi/../../src/mapi/u_current.h:72: undefined reference to `__imp__glapi_Dispatch'
C:\msys64\home\animator\mesa\Mesa-10.3.7\src\mapi/../../src/mapi/u_current.h:72: undefined reference to `__imp__glapi_Dispatch'
.libs/shared_glapi_libglapi_la-entry.o:C:\msys64\home\animator\mesa\Mesa-10.3.7\src\mapi/../../src/mapi/u_current.h:72: more undefined references to `__imp__glapi_Dispatch' follow
collect2.exe: error: ld returned 1 exit status
Makefile:1208: die Regel für Ziel „shared-glapi/libglapi.la“ scheiterte
make[4]: *** [shared-glapi/libglapi.la] Fehler 1
make[4]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/mapi“ wird verlassen
Makefile:1588: die Regel für Ziel „all-recursive“ scheiterte
make[3]: *** [all-recursive] Fehler 1
make[3]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/mapi“ wird verlassen
Makefile:1104: die Regel für Ziel „all“ scheiterte
make[2]: *** [all] Fehler 2
make[2]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src/mapi“ wird verlassen
Makefile:517: die Regel für Ziel „all-recursive“ scheiterte
make[1]: *** [all-recursive] Fehler 1
make[1]: Verzeichnis „/home/animator/mesa/Mesa-10.3.7/src“ wird verlassen
Makefile:586: die Regel für Ziel „all-recursive“ scheiterte
make: *** [all-recursive] Fehler 1