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* [Bug c++/56038] New: declarations in xmmintrin.h conflict with mingw-w64 intrin.h in c++ mode
@ 2013-01-18 22:05 erik-gcc-bugzilla at vanpienbroek dot nl
  2013-02-15 10:41 ` [Bug c++/56038] " kretz at kde dot org
                   ` (10 more replies)
  0 siblings, 11 replies; 12+ messages in thread
From: erik-gcc-bugzilla at vanpienbroek dot nl @ 2013-01-18 22:05 UTC (permalink / raw)
  To: gcc-bugs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56038

             Bug #: 56038
           Summary: declarations in xmmintrin.h conflict with mingw-w64
                    intrin.h in c++ mode
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: erik-gcc-bugzilla@vanpienbroek.nl
                CC: ktietz70@googlemail.com
            Target: i686-w64-mingw32
             Build: gcc 4.8 20130106 snapshot, r194954


While testing gcc 4.8 (for the target i686-w64-mingw32) I stumbled across a
compile failure while trying to build Qt5. Here's a minimal testcase to
reproduce this compile failure:

#include <algorithm>
#include <intrin.h>

int main()
{
    return 0;
}

When trying to build this with gcc 4.8 and a recent mingw-w64 trunk snapshot
the following error occurs:

$ i686-w64-mingw32-g++ -O2 -msse2 -std=c++11 test.cpp
In file included from
/usr/lib64/gcc/i686-w64-mingw32/4.8.0/include/x86intrin.h:34:0,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/bits/opt_random.h:33,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/random:51,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/bits/stl_algo.h:67,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/algorithm:63,
                 from test.cpp:1:
/usr/lib64/gcc/i686-w64-mingw32/4.8.0/include/xmmintrin.h:997:1: error:
previous declaration of 'int _m_pextrw(__m64, int)' with 'C++' linkage
 _m_pextrw (__m64 const __A, int const __N)
 ^
In file included from test.cpp:2:0:
/usr/i686-w64-mingw32/sys-root/mingw/include/intrin.h:561:5: error: conflicts
with new declaration with 'C' linkage
     __MACHINEX86X_NOX64(int _m_pextrw(__m64,int))
     ^
In file included from
/usr/lib64/gcc/i686-w64-mingw32/4.8.0/include/x86intrin.h:34:0,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/bits/opt_random.h:33,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/random:51,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/bits/stl_algo.h:67,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/algorithm:63,
                 from test.cpp:1:
/usr/lib64/gcc/i686-w64-mingw32/4.8.0/include/xmmintrin.h:1018:1: error:
previous declaration of '__m64 _m_pinsrw(__m64, int, int)' with 'C++' linkage
 _m_pinsrw (__m64 const __A, int const __D, int const __N)
 ^
In file included from test.cpp:2:0:
/usr/i686-w64-mingw32/sys-root/mingw/include/intrin.h:566:5: error: conflicts
with new declaration with 'C' linkage
     __MACHINEX86X_NOX64(__m64 _m_pinsrw(__m64,int,int))
     ^
In file included from
/usr/lib64/gcc/i686-w64-mingw32/4.8.0/include/x86intrin.h:34:0,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/bits/opt_random.h:33,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/random:51,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/bits/stl_algo.h:67,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/algorithm:63,
                 from test.cpp:1:
/usr/lib64/gcc/i686-w64-mingw32/4.8.0/include/xmmintrin.h:1119:1: error:
previous declaration of '__m64 _m_pshufw(__m64, int)' with 'C++' linkage
 _m_pshufw (__m64 __A, int const __N)
 ^
In file included from test.cpp:2:0:
/usr/i686-w64-mingw32/sys-root/mingw/include/intrin.h:578:5: error: conflicts
with new declaration with 'C' linkage
     __MACHINEX86X_NOX64(__m64 _m_pshufw(__m64,int))
     ^
In file included from
/usr/lib64/gcc/i686-w64-mingw32/4.8.0/include/x86intrin.h:34:0,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/bits/opt_random.h:33,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/random:51,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/bits/stl_algo.h:67,
                 from
/usr/i686-w64-mingw32/sys-root/mingw/include/c++/algorithm:63,
                 from test.cpp:1:
/usr/lib64/gcc/i686-w64-mingw32/4.8.0/include/xmmintrin.h:716:1: error:
previous declaration of '__m128 _mm_shuffle_ps(__m128, __m128, int)' with 'C++'
linkage
 _mm_shuffle_ps (__m128 __A, __m128 __B, int const __mask)
 ^
In file included from test.cpp:2:0:
/usr/i686-w64-mingw32/sys-root/mingw/include/intrin.h:656:5: error: conflicts
with new declaration with 'C' linkage
     __MACHINEX86X_NOIA64(__m128 _mm_shuffle_ps(__m128,__m128,int const))
     ^


The above testcase built fine with gcc 4.7 and the exact same version of
mingw-w64, so I consider this a regression in gcc 4.8

With the (pretty straightforward) change below I managed to resolve the issue:

--- gcc/config/i386/xmmintrin.h.orig    2013-01-18 14:57:27.762645582 +0100
+++ gcc/config/i386/xmmintrin.h    2013-01-18 14:58:27.604561940 +0100
@@ -37,6 +37,10 @@
 /* Get _mm_malloc () and _mm_free ().  */
 #include <mm_malloc.h>

+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* The Intel API is flexible enough that we must allow aliasing with other
    vector types, and their scalar components.  */
 typedef float __m128 __attribute__ ((__vector_size__ (16), __may_alias__));
@@ -1241,6 +1245,10 @@
   (row3) = __builtin_ia32_movhlps (__t3, __t2);                \
 } while (0)

+#ifdef __cplusplus
+}
+#endif
+
 /* For backward source compatibility.  */
 #ifdef __SSE2__
 # include <emmintrin.h>


I don't know if this change is the correct fix, but it resolves the qt5 build
failure for me.


^ permalink raw reply	[flat|nested] 12+ messages in thread
end of thread, other threads:[~2014-03-23 19:17 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-01-18 22:05 [Bug c++/56038] New: declarations in xmmintrin.h conflict with mingw-w64 intrin.h in c++ mode erik-gcc-bugzilla at vanpienbroek dot nl
2013-02-15 10:41 ` [Bug c++/56038] " kretz at kde dot org
2013-03-25  4:12 ` net147 at gmail dot com
2013-03-25 10:38 ` net147 at gmail dot com
2013-03-26 12:26 ` kai.koehne at digia dot com
2013-06-10  8:37 ` kai.koehne at digia dot com
2013-09-20  7:29 ` vanboxem.ruben at gmail dot com
2013-09-20 14:36 ` jacek at codeweavers dot com
2013-09-20 15:35 ` hjl.tools at gmail dot com
2013-09-20 16:08 ` jason at gcc dot gnu.org
2014-03-22 15:34 ` tim.lebedkov at gmail dot com
2014-03-23 19:17 ` erik-gcc-bugzilla at vanpienbroek dot nl

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