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Date: Sun, 13 Jan 2013 15:44:07 +0100
From: Angelo Graziosi <angelo DOT graziosi AT alice DOT it>
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To: cygwin AT cygwin DOT com
CC: Jon TURNEY <jon DOT turney AT dronecode DOT org DOT uk>
Subject: Re: Another issue with CLANG
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Il 13/01/2013 15.31, Jon TURNEY ha scritto:
> On 11/01/2013 12:54, Angelo Graziosi wrote:
>> An application which need to be built with clang++, fails to build when it
>> includes glx.h and indirectly windows.h headers like in the test case shown
>> below.
>>
>> In short, X11/Xlib.h define Status as a macro (an alias for int) instead
>> rpcdce.h uses Status a a pointer variable name...
>
> I don't think there's anything clang-specific about this problem.  The same
> issue can be seen with gcc.
>
> If your application needs both Xlib and Win32 interfaces, you should include
> <X11/Xwindows.h> rather than <windows.h>, which wraps any conflicting
> declarations.
>
> (xcb uses a sensible namespace, so this is not necessary for applications
> which use xcb and Win32.)
>
> You probably need the latest upstream x11proto (not yet packaged for cygwin)
> for this wrapping to work correctly with the mingw-w64 w32api headers [1]
>
> Alternatively you can work around this yourself e.g. as in [2]


Thanks Jon, foo.cxx was anly a test case to reproduce the errors. In the 
true application those headers were included indirectly... :-(

In file included from input_line_87:1:
In file included from include/TX11GL.h:29:
In file included from /usr/include/GL/glx.h:45:
In file included from /usr/include/w32api/GL/gl.h:13:
In file included from /usr/include/w32api/windows.h:88:
In file included from /usr/include/w32api/rpc.h:70:
/usr/include/w32api/rpcdce.h:142:88: error: expected ')'
   typedef void __RPC_API RPC_OBJECT_INQ_FN(UUID *ObjectUuid,UUID 
*TypeUuid,RPC_STATUS *Status);
 
                 ^
/usr/include/X11/Xlib.h:87:16: note: expanded from macro 'Status'
#define Status int
                ^

Ciao,
  Angelo.

>
>> $ cat foo.cxx
>> #include <GL/glx.h>
>> #include <windows.h>
>>
>>
>> int foo()
>> {
>>    return 0;
>> }
>>
>> $ clang++ -D_X86_=1 -c foo.cxx -o foo.o
>
> [1]
> http://cgit.freedesktop.org/xorg/proto/xproto/commit/?id=c0dd615fddb6fa487d1a914c6928f3843489725e
> [2]
> http://cgit.freedesktop.org/~jturney/xserver/commit/?h=cygwin-patches-for-1.13&id=c493cd82c5b512efad284304f19349cc84a2c63d
>


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