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Date: Mon, 14 Jan 2013 12:47:06 +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 16.20, Jon TURNEY ha scritto:
> On 13/01/2013 14:44, Angelo Graziosi wrote:
>> 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:
>
> This looks very wrong, mixing native and X GL headers isn't going to work.
>
> Assuming you mean to build an X application, this should be finding
> /usr/include/GL/gl.h, so maybe an include path issue?

For the record...

ROOT guys have fixed this issue with the following patch to their 
patched version of llvm/clang:

$ cat InitHeaderSearch.cpp.diff
--- 
ROOT/interpreter/llvm/src/tools/clang/lib/Frontend/InitHeaderSearch.cpp 
    2013-01-01 11:50:05.000000000 +0100
+++ 
root_trunk/interpreter/llvm/src/tools/clang/lib/Frontend/InitHeaderSearch.cpp 
       2013-01-14 12:10:43.906250000 +0100
@@ -305,7 +305,8 @@
    case llvm::Triple::RTEMS:
      break;
    case llvm::Triple::Cygwin:
-    AddPath("/usr/include/w32api", System, true, false, false);
+    // The headers in w32api/ are not cygwin-compatible (but native)
+    //AddPath("/usr/include/w32api", System, true, false, false);
      break;
    case llvm::Triple::MinGW32: {
        // mingw-w64 crt include paths

Ciao,
  Angelo.


>
>> 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);


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