[LLVMbugs] [Bug 12736] New: -fms-compatibility results in compile errors when including <emmintrin.h>

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12736

             Bug #: 12736
           Summary: -fms-compatibility results in compile errors when
                    including <emmintrin.h>
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Headers
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: louismichaelhowe at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


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).

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