Never mind. I just tried it again and it looks like Visual Studio was using its own compiler even though I specified a different one with CMake. I tried it with NMake and I could tell that it was using clang but I couldn't get past include errors with the "ammintrin.h" header.
From: Justin Holewinski [mailto:justin.holewin...@gmail.com] Sent: Thursday, May 24, 2012 5:28 PM To: Keith Gardner Cc: Brad King; cmake@cmake.org Subject: Re: [CMake] Clang + MinGW Linking Issue Were you passing custom command-line arguments in the project? Clang only accepts a very limited set of CL-style arguments (AFAIK): >c:\projects\llvm-dev\build-3.1\bin\clang clang-test.c -out:clang-test.exe >c:\projects\llvm-dev\build-3.1\bin\clang clang-test.c -out:clang-test.exe -Zm clang: error: unsupported use of internal gcc -Z option '-Zm' >c:\projects\llvm-dev\build-3.1\bin\clang clang-test.c -out:clang-test.exe -MT clang: error: argument to '-MT' is missing (expected 1 value) This is with a Clang built with the compilers from the Windows SDK 7.1. On Thu, May 24, 2012 at 2:12 PM, Keith Gardner <kgard...@zebraimaging.com<mailto:kgard...@zebraimaging.com>> wrote: I have built clang (llvm) on windows with Visual Studio 2010 and used the built binaries as the compiler inside of a Visual Studio project. This was with clang 3.0 and llvm 2.9.1. From: cmake-boun...@cmake.org<mailto:cmake-boun...@cmake.org> [mailto:cmake-boun...@cmake.org<mailto:cmake-boun...@cmake.org>] On Behalf Of Justin Holewinski Sent: Thursday, May 24, 2012 1:49 PM To: Brad King Cc: cmake@cmake.org<mailto:cmake@cmake.org> Subject: Re: [CMake] Clang + MinGW Linking Issue On Thu, May 24, 2012 at 10:08 AM, Brad King <brad.k...@kitware.com<mailto:brad.k...@kitware.com>> wrote: On 05/24/2012 12:22 PM, Justin Holewinski wrote: > I narrowed the problem down to Clang not having > Platform/Windows-Clang-{C,CXX}.cmake files. There is an issue tracker entry for this: http://www.cmake.org/Bug/view.php?id=13035 but it is in the backlog waiting for more feedback and a volunteer. The main problem is distinguishing the GNU-compatible and MS-compatible builds of Clang. Oops, missed that issue. Sorry about that! > If I add the following two files then everything starts to work as expected: > > Platform/Windows-Clang-C.cmake: > > if(MINGW) > include(Platform/Windows-GNU) > __windows_compiler_gnu(C) > else() > # Chain to generic Windows configuration > include(Platform/Windows) > endif() > > Platform/Windows-Clang-CXX.cmake: > > if(MINGW) > include(Platform/Windows-GNU) > __windows_compiler_gnu(C) > else() > # Chain to generic Windows configuration > include(Platform/Windows) > endif() > > This way, using Clang with MinGW will force GNU-style platform > options instead of VS-style Windows options. > Is this more or less the "right way" to fix this in CMake? Interesting approach. That may be better than separating the compiler id as mentioned in the above-linked issue. The "MINGW" value is set based on CMAKE_C_PLATFORM_ID which is computed in the same way and at the same time as CMAKE_C_COMPILER_ID. Try: $ cat Platform/Windows-Clang-C.cmake if("${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW") include(Platform/Windows-GNU-C) else() include(Platform/Windows-cl) endif() $ cat Platform/Windows-Clang-CXX.cmake if("${CMAKE_CXX_PLATFORM_ID}" MATCHES "MinGW") include(Platform/Windows-GNU-CXX) else() include(Platform/Windows-cl) endif() Do you have both the MS-style and GNU-style Clang available to test? This works for the MinGW build. I really can't say if this fixes the library naming issue for the MS-style Clang. Clang does not have a VC-compatible driver (that I know of) so does not accept VC-style arguments like "/O2", which causes CMake to fail early on in the configure process when using the NMake generator. Clang with MinGW is the only really supported configuration at this point. Thanks, -Brad -- Thanks, Justin Holewinski -- Thanks, Justin Holewinski
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