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Subject:	Re: Clang and windows headers
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On 01/10/2013 05:20 PM, Angelo Graziosi wrote:
> Trying to compile a C++ source file including windows.h header with
> clang++, fails with
>=20
>   #error Must define a target architecture
I have hit this too with log4cplus. This is my workaround:

// Work around missing _X86_ symbol with Clang on Cygwin.
#if ! defined (_X86_) && defined (__i386__)
#  define _X86_ 1
#endif
#include <windows.h>

>=20
>=20
> For example,
>=20
> $ cat foo.cxx
> #include <windows.h>
>=20
> int main()
> {
>   return 0;
> }
>=20
> $ clang++ -c foo.cxx -o foo.o
> In file included from foo.cxx:1:
> In file included from /usr/include/w32api/windows.h:69:
> In file included from /usr/include/w32api/windef.h:139:
> /usr/include/w32api/winnt.h:375:2: error: Must define a target
> architecture.
> #error Must define a target architecture.
>  ^
> /usr/include/w32api/winnt.h:2410:7: error: unknown type name 'PCONTEXT';
> did you
>       mean '_CONTEXT'?
>       PCONTEXT ContextRecord;
>       ^
> /usr/include/w32api/excpt.h:84:96: note: '_CONTEXT' declared here
>   ..._EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*);
>                                        ^
> In file included from foo.cxx:1:
> In file included from /usr/include/w32api/windows.h:69:
> In file included from /usr/include/w32api/windef.h:139:
> /usr/include/w32api/winnt.h:2410:16: error: field has incomplete type
> '_CONTEXT'
>       PCONTEXT ContextRecord;
>                ^
> /usr/include/w32api/excpt.h:84:96: note: forward declaration of '_CONTEXT'
>   ..._EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*);
>                                        ^
> In file included from foo.cxx:1:
> In file included from /usr/include/w32api/windows.h:69:
> In file included from /usr/include/w32api/windef.h:139:
> /usr/include/w32api/winnt.h:5668:25: error: variable has incomplete type
> 'void'
>     NTSYSAPI VOID NTAPI RtlCaptureContext(PCONTEXT ContextRecord);
>                         ^
> /usr/include/w32api/winnt.h:5668:43: error: use of undeclared identifier
>       'PCONTEXT'
>     NTSYSAPI VOID NTAPI RtlCaptureContext(PCONTEXT ContextRecord);
>                                           ^
> In file included from foo.cxx:1:
> In file included from /usr/include/w32api/windows.h:70:
> /usr/include/w32api/winbase.h:611:11: error: unknown type name
> 'PCONTEXT'; did
>       you mean '_CONTEXT'?
>   typedef PCONTEXT LPCONTEXT;
>           ^
> /usr/include/w32api/excpt.h:84:96: note: '_CONTEXT' declared here
>   ..._EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*);
>                                        ^
> In file included from foo.cxx:1:
> In file included from /usr/include/w32api/windows.h:70:
> /usr/include/w32api/winbase.h:1375:67: error: unknown type name
> 'CONTEXT'; did
>       you mean '_CONTEXT'?
>   ...WINAPI SetThreadContext(HANDLE hThread,CONST CONTEXT *lpContext);
>                                                   ^
> /usr/include/w32api/excpt.h:84:96: note: '_CONTEXT' declared here
>   ..._EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*);
>                                        ^
> 7 errors generated.
>=20
>=20
> Really I have seen this the first time trying to build the next release
> of ROOT (i.e. source from svn; the main page for ROOT is :
> http://root.cern.ch).
>=20
> Indeed now ROOT uses clang tools to build (GCC is used to bootstrap
> ROOT's patched version of CLANG...). Nevertheless the same errors occurs
> using Cygwin's CLANG as the above simple test case shows...

--
VZ



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