[cfe-dev] Clang inconsistency with gcc on Windows

[Yaron Keren]

Boost tries to supplies its own version of the Windows API to avoid
including WIndows.h
Boost version of the API is not strictly identical to Windows.h, so if
Windows.h do get included somehow such errors happen. I always
-DBOOST_USE_WINDOWS_H to force Boost to use Windows.h instead of its own.



2015-05-31 20:48 GMT+03:00 Edward Diener <eldlistmailingz at tropicsoft.com>:

> Compiling some Boost library code the latest clang has produced an
> inconsistency with gcc on Windows that is making it impossible to build
> Boost libraries successfully.
>
> The code in question, where clang is given an error:
>
>  clang-linux.compile.c++.without-pth
>> ..\..\..\bin.v2\libs\context\build\clang-linux-3.7.0\debug\threading-multi\windows\stack_traits.obj
>> In file included from
>> ..\..\..\libs\context\src\windows\stack_traits.cpp:24:
>> In file included from ..\..\..\boost/thread.hpp:13:
>> In file included from ..\..\..\boost/thread/thread.hpp:12:
>> In file included from ..\..\..\boost/thread/thread_only.hpp:15:
>> In file included from ..\..\..\boost/thread/win32/thread_data.hpp:10:
>> In file included from ..\..\..\boost/thread/thread_time.hpp:10:
>> In file included from ..\..\..\boost/date_time/microsec_time_clock.hpp:23:
>> ..\..\..\boost/date_time/filetime_functions.hpp:57:46: error: conflicting
>> types for 'GetSystemTimeAsFileTime'
>>         __declspec(dllimport) void __stdcall
>> GetSystemTimeAsFileTime(FILETIME* lpFileTime);
>>                                              ^
>> /mingw/include\winbase.h:1397:24: note: previous declaration is here
>> WINBASEAPI void WINAPI GetSystemTimeAsFileTime(LPFILETIME);
>>
>                          ^
>
> and more of the same in many places building Boost libraries with clang.
>
> This is with the latest clang, which I build with mingw/gcc-4.8.1 on
> Windows.
>
> With gcc-4.8.1:
>
>  gcc.compile.c++
>> ..\..\..\bin.v2\libs\context\build\gcc-mingw-4.8.1\debug\threading-multi\windows\stack_traits.o
>>
>
> With gcc-4.9.2
>
>  gcc.compile.c++
>> ..\..\..\bin.v2\libs\context\build\gcc-mingw-4.9.2\debug\threading-multi\windows\stack_traits.o
>>
>
> This is happening extensively in Boost code which uses the Windows API
> when compiling under Windows.
>
> I do not know what WINBASEAPI is supposed to resove to under mingw, but
> clearly it should not be different for gcc and clang under Windows and gcc
> has no problems with this.
>
>
>
>
>
>
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