[cfe-dev] Compiler error including windows.h

[Edward Diener via cfe-dev]

I build clang from the latest source using mingw-64/gcc-7.1. Using 
mingw-64/gcc-7.1 as the backend, when I compile:

// test_compiler.cpp

#include <windows.h>
int main()
{
return 0;
}

with the command line:

some_path/clang++" -c -x c++ -O0 -g -fno-inline -Wall -g -march=i686 
-m32" -o "some_path\test_compiler.obj" "test_compiler.cpp"

I get:

In file included from test_compiler.cpp:1:
In file included from 
C:\Utilities\mingw-w64\i686-7.1.0-posix-dwarf-rt_v5-rev0\mingw32\i686-w64-mingw32\include\windows.h:69:
In file included from 
C:\Utilities\mingw-w64\i686-7.1.0-posix-dwarf-rt_v5-rev0\mingw32\i686-w64-mingw32\include\windef.h:8:
In file included from 
C:\Utilities\mingw-w64\i686-7.1.0-posix-dwarf-rt_v5-rev0\mingw32\i686-w64-mingw32\include\minwindef.h:163:
C:\Utilities\mingw-w64\i686-7.1.0-posix-dwarf-rt_v5-rev0\mingw32\i686-w64-mingw32\include\winnt.h:4720:18: 
error: default initialization of an object of const type 'const GUID' 
(aka 'const _GUID') without a user-provided default constructor
     DEFINE_GUID (GUID_MAX_POWER_SAVINGS, 0xa1841308, 0x3541, 0x4fab, 
0xbc, 0x81, 0xf7, 0x15, 0x56, 0xf2, 0x0b, 0x4a);
                  ^
C:\Utilities\mingw-w64\i686-7.1.0-posix-dwarf-rt_v5-rev0\mingw32\i686-w64-mingw32\include\winnt.h:4721:18: 
error: default initialization of an object of const type 'const GUID' 
(aka 'const _GUID') without a user-provided default constructor
     DEFINE_GUID (GUID_MIN_POWER_SAVINGS, 0x8c5e7fda, 0xe8bf, 0x4a96, 
0x9a, 0x85, 0xa6, 0xe2, 0x3a, 0x8c, 0x63, 0x5c);
                  ^

etc. with the same errors for all the other DEFINE_GUID s in winnt.h

Needless to say compiling the same source with mingw-64/gcc-7.1 directly 
succeeds.

Is this a bug in the latest clang source ?