[LLVMdev] size_t?

Tue Sep 30 18:21:17 PDT 2014

I believe that we provide a definition of size_t inside the compiler itself
when clang is in MSVC compatibility mode.

On Tue, Sep 30, 2014 at 5:51 PM, Eric Mader <emader at gmx.us> wrote:

>  I did some more investigation of the size_t size error. I misunderstood
> what was happening. It turns out that size_t is already defined before my
> prefix header is included. I added the following static_asserts to the font
> of the header:
>
> static_assert(sizeof(size_t) != 4, "sizeof(size_t) == 4");
> static_assert(sizeof(size_t) != 8, "sizeof(size_t) == 8");
>
> The first static_assert fires:
>
> 1>Build started 9/30/2014 2:29:54 PM.
> 1>clang-cl.exe : warning : argument unused during compilation: '/Gm-'
> 1>clang-cl.exe : warning : argument unused during compilation: '/GS'
> 1>clang-cl.exe : warning : argument unused during compilation:
> '/fp:precise'
> 1>clang-cl.exe : warning : argument unused during compilation:
> '/FdDebug\x64\vc120.pdb'
> 1>clang-cl.exe : warning : argument unused during compilation: '/Gd'
> 1>  In file included from <built-in>:187:
> 1>  In file included from <command line>:19:
> 1>[elided header file name](9,1): error : static_assert failed
> "sizeof(size_t) == 4"
> 1>  static_assert(sizeof(size_t) != 4, "sizeof(size_t) == 4");
> 1>  ^             ~~~~~~~~~~~~~~~~~~~
>
> Later on, I get an error saying that crtdefs.h is trying to redefine
> size_t from an unsigned int to an unsigned long long...
>
> Perhaps one of my preprocessor defines is causing these errors:
>
> WIN32
> _DEBUG
> _WINDOWS
> _USRDLL
> _SCL_SECURE_NO_WARNINGS
> _CRT_SECURE_NO_WARNINGS
> _WIN64
> _x86_64_ = 1
>
> (I added the "SECURE_NO_WARNINGS" defines when I ported an earlier version
> of this code to VS 2005; don't remember why any more...)
> (There are a couple of other defines that are specific to the DLL I'm
> trying to build)
>
> Regards,
> Eric Mader
>
>
> On 9/30/14, 1:01 PM, Eric Mader wrote:
>
> Hi Reid,
>
> I copied the x64 toolsets by hand; they got installed to C:\Program Files
> (x86)\LLVM\tools\msbuild\x64; they just didn't get moved correctly by
> install.bat.
>
> I just verified that the LLVM-vs2013 toolset.props is correct.
>
> If it is a bitness problem, perhaps I'm failing to define something
> correctly?
>
> Regards,
> Eric
>
> On 9/30/14, 11:29 AM, Reid Kleckner wrote:
>
> This looks like some kind of bitness conflict. If you are building for
> win64, are you sure clang is getting the -m64 argument?
>
>  I recall that you copied the win32 platform toolset xml files over by
> hand, and I don't think they will have the correct flags. If you see this
> line in the x64 toolset.props file, replace -m32 with -m64 and try again:
> <AdditionalOptions>-m32 -fmsc-version=1700
> %(AdditionalOptions)</AdditionalOptions>
>
>  In the meantime, I think Hans is trying to fix the installation of those
> xml files and hopefully that will fix issues for other users going forwards.
>
> On Tue, Sep 30, 2014 at 1:55 PM, Eric Mader <emader at gmx.us> wrote:
>
>>  I'm getting compile errors because size_t is getting redefined. My
>> "forced include file" starts with:
>>
>> #if BUILDING_FOR_WINDOWS
>> #define NOMINMAX
>>
>> /* deal with the fact that windef.h also defines BOOL */
>> #define BOOL WINBOOL
>>
>> #include <windows.h>
>> #include <intrin.h>
>>
>> #undef BOOL
>> #endif
>>
>> Looking at the preprocessor expansion of a typical .cpp file, I see that
>> crtdefs.h defines size_t like this:
>>
>> typedef unisgned __int64 size_t;
>>
>> Later on, <LLVM>\lib\clang\3.6.0\includes\stddef.h defines it as:
>>
>> typedef unsigned int size_t;
>>
>> Is there some other magic I need to do to get these to work?
>>
>> I'm also seeing a bunch of errors like this having to do with intrinsics:
>>
>> 1>  In file included from C:\Program Files (x86)\Microsoft Visual Studio
>> 12.0\VC\include\algorithm:6:
>> 1>  In file included from C:\Program Files (x86)\Microsoft Visual Studio
>> 12.0\VC\include\xmemory:6:
>> 1>  In file included from C:\Program Files (x86)\Microsoft Visual Studio
>> 12.0\VC\include\xmemory0:909:
>> 1>  In file included from C:\Program Files
>> (x86)\LLVM\msbuild-bin\..\lib\clang\3.6.0\include\intrin.h:34:
>> 1>  In file included from C:\Program Files
>> (x86)\LLVM\msbuild-bin\..\lib\clang\3.6.0\include\x86intrin.h:29:
>> 1>  In file included from C:\Program Files
>> (x86)\LLVM\msbuild-bin\..\lib\clang\3.6.0\include\immintrin.h:28:
>> 1>C:\Program Files
>> (x86)\LLVM\msbuild-bin\..\lib\clang\3.6.0\include\mmintrin.h(52,40): error
>> : cannot initialize a parameter of type '__attribute__((__vector_size__(2 *
>> sizeof(int)))) int' (vector of 2 'int' values) with an rvalue of type
>> '__v2si' (aka 'int')
>> 1>      return __builtin_ia32_vec_ext_v2si((__v2si)__m, 0);
>> 1>                                         ^~~~~~~~~~~
>>
>> I suspect that these might be caused by the same thing as the size_t
>> problem...
>>
>> Regards,
>> Eric Mader
>>
>>
>>
>>
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>
>
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