[LLVMbugs] [Bug 7796] New: Unconditional gnu extension usage in stddef.h breaks VS2008 headers

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7796

           Summary: Unconditional gnu extension usage in stddef.h breaks
                    VS2008 headers
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P
         Component: Headers
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: per at lumai.se
                CC: llvmbugs at cs.uiuc.edu


When using clang to compile a trivial C++ program using <iostream> in the
Visual Studio 2008 environment, clang/2.8/include/stddef.h unconditionally
#defines NULL to __null. This causes a problem in the VS2008 header <wchar.h>,
where the function

__inline int __CRTDECL mbsinit(_In_opt_ const mbstate_t *_P)
        {return (_P == NULL || *_P == 0); }

expands to

__inline int mbsinit( const mbstate_t *_P)
        {return (_P == || *_P == 0); }

Test case:

#include <iostream>

int main(int argc, char **argv)
{
    cout << "Hello C++ world" << endl;
    return 0;
}

Resulting error:

D:\Temp\llvm>clang++ -fno-exceptions test.cpp -ferror-limit=2
In file included from test.cpp:1:
In file included from c:\Program Files\VStudio 9.0\VC\include/iostream:6:
In file included from c:\Program Files\VStudio 9.0\VC\include/istream:6:
In file included from c:\Program Files\VStudio 9.0\VC\include/ostream:6:
In file included from c:\Program Files\VStudio 9.0\VC\include/ios:6:
In file included from c:\Program Files\VStudio 9.0\VC\include/xlocnum:9:
In file included from c:\Program Files\VStudio 9.0\VC\include/streambuf:6:
In file included from c:\Program Files\VStudio 9.0\VC\include/xiosbase:6:
In file included from c:\Program Files\VStudio 9.0\VC\include/xlocale:8:
In file included from c:\Program Files\VStudio 9.0\VC\include/stdexcept:7:
In file included from c:\Program Files\VStudio 9.0\VC\include/xstring:6:
In file included from c:\Program Files\VStudio 9.0\VC\include/xmemory:9:
In file included from c:\Program Files\VStudio 9.0\VC\include/xutility:7:
In file included from c:\Program Files\VStudio 9.0\VC\include/utility:6:
In file included from c:\Program Files\VStudio 9.0\VC\include/iosfwd:8:
In file included from c:\Program Files\VStudio 9.0\VC\include/cwchar:13:
c:\Program Files\VStudio 9.0\VC\include/wchar.h(1209) :  error: expected
expression
        {return (_P == NULL || *_P == 0); }
                            ^

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