-fms-compatibility results in compile errors when including <emmintrin.h>

[llvmbot]

Bugzilla Link	12736
Resolution	WORKSFORME
Resolved on	Jul 09, 2013 13:36
Version	trunk
OS	All
Blocks	llvm/llvm-bugzilla-archive#13707
Reporter	LLVM Bugzilla Contributor
CC	@AaronBallman,@tritao

Extended Description

Test which demonstrates this, using clang version 3.2 (trunk 156145)

cat > test-emmintrin.c << EOF
#include <emmintrin.h>
EOF
clang -c test-emmintrin.c -fms-compatibility -msse2

... results in errors like this:

/opt/clang-3.2svn/bin/../lib/clang/3.2/include/emmintrin.h:134:20: error:
invalid conversion between vector type '__v4si' and scalar type '__m128d'
(aka 'double')
return (__m128d)((__v4si)a & (__v4si)b);
^~~~~~~~~

From <emmintrin.h>:

typedef double __m128d attribute((vector_size(16)));

It looks like newer versions of Clang ignore gcc-style vector attributes when using the -fms-compatibility flag. This very well might be the intended behavior - but it seems like such a simple test case shouldn't fail to compile.

This behavior doesn't occur with clang version 3.1 (trunk 145140).

[tritao]

I can't reproduce this. Is this still an issue for you?

[AaronBallman]

I cannot reproduce this issue either; if this is still reproducible, please let us know more about your setup.

[tritao]

mentioned in issue llvm/llvm-bugzilla-archive#13707