i686 intrinsics definitions conflict with mingw-w64 definitions

[jeremyd2019]

I encountered this building libuv, but is an issue with clang when building with -march=i686 (which is specified in makepkg_clang32.conf), where SSE is disabled.

In file included from ../libuv-1.40.0/src/win/thread.c:29:
In file included from C:/msys64/clang32/lib/clang/11.0.0/include/intrin.h:12:
C:/msys64/clang32/i686-w64-mingw32/include/intrin.h:87:36: error: typedef redefinition with different types ('union __m64' vs '__attribute__((__vector_size__(1* sizeof(long long)))) long long' (vector of 1 'long long' value))
typedef union __m64 { char v[7]; } __m64;
                                   ^
C:/msys64/clang32/lib/clang/11.0.0/include/mmintrin.h:13:19: note: previous definition is here
typedef long long __m64 __attribute__((__vector_size__(8), __aligned__(8)));
                  ^
In file included from ../libuv-1.40.0/src/win/thread.c:29:
In file included from C:/msys64/clang32/lib/clang/11.0.0/include/intrin.h:12:
C:/msys64/clang32/i686-w64-mingw32/include/intrin.h:90:38: error: typedef redefinition with different types ('union __m128' vs '__attribute__((__vector_size__(4 * sizeof(float)))) float' (vector of 4 'float' values))
typedef union __m128 { char v[16]; } __m128;
                                     ^
C:/msys64/clang32/lib/clang/11.0.0/include/xmmintrin.h:17:15: note: previous definition is here
typedef float __m128 __attribute__((__vector_size__(16), __aligned__(16)));
              ^
In file included from ../libuv-1.40.0/src/win/thread.c:29:
In file included from C:/msys64/clang32/lib/clang/11.0.0/include/intrin.h:12:
C:/msys64/clang32/i686-w64-mingw32/include/intrin.h:93:39: error: typedef redefinition with different types ('union __m128d' vs '__attribute__((__vector_size__(2 * sizeof(double)))) double' (vector of 2 'double' values))
typedef union __m128d { char v[16]; } __m128d;
                                      ^
C:/msys64/clang32/lib/clang/11.0.0/include/emmintrin.h:15:16: note: previous definition is here
typedef double __m128d __attribute__((__vector_size__(16), __aligned__(16)));
               ^
In file included from ../libuv-1.40.0/src/win/thread.c:29:
In file included from C:/msys64/clang32/lib/clang/11.0.0/include/intrin.h:12:
C:/msys64/clang32/i686-w64-mingw32/include/intrin.h:94:39: error: typedef redefinition with different types ('union __m128i' vs '__attribute__((__vector_size__(2 * sizeof(long long)))) long long' (vector of 2 'long long' values))
typedef union __m128i { char v[16]; } __m128i;
                                      ^
C:/msys64/clang32/lib/clang/11.0.0/include/emmintrin.h:16:19: note: previous definition is here
typedef long long __m128i __attribute__((__vector_size__(16), __aligned__(16)));
                  ^
4 errors generated.
make: *** [Makefile:2588: src/win/libuv_la-thread.lo] Error 1

[jeremyd2019]

A workaround that seemed to help was adding -D__MINGW_FORCE_SYS_INTRINS to the CPPFLAGS in makepkg_clang32.conf. Not all packages seem to respect CPPFLAGS as well as they do CFLAGS though.

[mati865]

Okay I think know what is wrong. Going to work on it in the evening.

[mati865]

Minimal reproducer:

#include <intrin.h>

int main() {
    return 0;
}

[mati865]

https://sourceforge.net/p/mingw-w64/mailman/message/37250983/

[mati865]

In the upstream repo now: https://sourceforge.net/p/mingw-w64/mingw-w64/ci/c1804804aff14f1b0333d782c9fac1cc904fcd9f/

[jeremyd2019]

I plan to wait for the time stuff (from msys2/CLANG-packages#21) to land and rebuild for both at the same time.

[jeremyd2019]

I've confirmed this is fixed now.