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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> cmake-bounces@cmake.org [mailto:cmake-bounces@cmake.org] <b>On Behalf Of </b>Justin Holewinski<br><b>Sent:</b> Thursday, May 24, 2012 1:49 PM<br><b>To:</b> Brad King<br><b>Cc:</b> cmake@cmake.org<br><b>Subject:</b> Re: [CMake] Clang + MinGW Linking Issue<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Thu, May 24, 2012 at 10:08 AM, Brad King <<a href="mailto:brad.king@kitware.com" target="_blank">brad.king@kitware.com</a>> wrote:<o:p></o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'>On 05/24/2012 12:22 PM, Justin Holewinski wrote:<br>> I narrowed the problem down to Clang not having Platform/Windows-Clang-{C,CXX}.cmake files.<o:p></o:p></p></div><p class=MsoNormal>There is an issue tracker entry for this:<br><br> <a href="http://www.cmake.org/Bug/view.php?id=13035" target="_blank">http://www.cmake.org/Bug/view.php?id=13035</a><br><br>but it is in the backlog waiting for more feedback and a volunteer.<br>The main problem is distinguishing the GNU-compatible and MS-compatible<br>builds of Clang.<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Oops, missed that issue. Sorry about that!<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><p class=MsoNormal style='margin-bottom:12.0pt'><br>> If I add the following two files then everything starts to work as expected:<br>><br>> Platform/Windows-Clang-C.cmake:<br>><br>> if(MINGW)<br>> include(Platform/Windows-GNU)<br>> __windows_compiler_gnu(C)<br>> else()<br>> # Chain to generic Windows configuration<br>> include(Platform/Windows)<br>> endif()<br>><br>> Platform/Windows-Clang-CXX.cmake:<br>><br>> if(MINGW)<br>> include(Platform/Windows-GNU)<br>> __windows_compiler_gnu(C)<br>> else()<br>> # Chain to generic Windows configuration<br>> include(Platform/Windows)<br>> endif()<br>><br>> This way, using Clang with MinGW will force GNU-style platform<br>> options instead of VS-style Windows options.<br>> Is this more or less the "right way" to fix this in CMake?<o:p></o:p></p></div><p class=MsoNormal>Interesting approach. That may be better than separating the<br>compiler id as mentioned in the above-linked issue. The "MINGW"<br>value is set based on CMAKE_C_PLATFORM_ID which is computed in<br>the same way and at the same time as CMAKE_C_COMPILER_ID. Try:<br><br> $ cat Platform/Windows-Clang-C.cmake<br> if("${CMAKE_C_PLATFORM_ID}" MATCHES "MinGW")<br> include(Platform/Windows-GNU-C)<br> else()<br> include(Platform/Windows-cl)<br> endif()<br><br> $ cat Platform/Windows-Clang-CXX.cmake<br> if("${CMAKE_CXX_PLATFORM_ID}" MATCHES "MinGW")<br> include(Platform/Windows-GNU-CXX)<br> else()<br> include(Platform/Windows-cl)<br> endif()<br><br>Do you have both the MS-style and GNU-style Clang available<br>to test?<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>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.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal><br>Thanks,<br>-Brad<o:p></o:p></p></blockquote></div><p class=MsoNormal><br><br clear=all><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'>-- <o:p></o:p></p><div><p class=MsoNormal>Thanks,<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Justin Holewinski<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>