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<p class="MsoNormal">Hi: I’m trying to create a 64-bit Visual Studio 12 (aka 2013) project with CMake 3.0.2. My CMakeLists.txt file is really simple:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">cmake_minimum_required( VERSION 3.0 )<o:p></o:p></p>
<p class="MsoNormal">project( cmc CXX )<o:p></o:p></p>
<p class="MsoNormal"># What compiler did we find?<o:p></o:p></p>
<p class="MsoNormal">message( "C++: ${CMAKE_CXX_COMPILER}" )<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">From a windows shell I do:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">> c:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64\vcvars64.bat<o:p></o:p></p>
<p class="MsoNormal">> cmake –G “Visual Studio 12 Win64” .<o:p></o:p></p>
<p class="MsoNormal">-- The CXX compiler identification is MSVC 18.0.31101.0<o:p></o:p></p>
<p class="MsoNormal">-- Check for working CXX compiler using: Visual Studio 12 2013 Win64<o:p></o:p></p>
<p class="MsoNormal">-- Check for working CXX compiler using: Visual Studio 12 2013 Win64 -- works<o:p></o:p></p>
<p class="MsoNormal">-- Detecting CXX compiler ABI info<o:p></o:p></p>
<p class="MsoNormal">-- Detecting CXX compiler ABI info - done<o:p></o:p></p>
<p class="MsoNormal">C++: C:/Program Files (x86)/Microsoft Visual Studio 12.0/VC/bin/x86_amd64/cl.exe<o:p></o:p></p>
<p class="MsoNormal">-- Configuring done<o:p></o:p></p>
<p class="MsoNormal">-- Generating done<o:p></o:p></p>
<p class="MsoNormal">-- Build files have been written to: C:/Users/dbarnett/cmc/build<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So, it appears to find the compiler OK since it emits the correct compiler identification. But, the actual value of CMAKE_CXX_COMPILER is not usable. If you try to execute C:/Program…./x86_amd64/cl.exe from within a CMake script or even
from the command line, it will fail and produce the well-known “0xc000007b” dialog (missing DLL). Unless you’ve sourced vcvarsx86_amd64.bat, the correct environment variables are not set for this version of the compiler.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">On the other hand, if I do “cmake –G NMake Makefiles”, I get what I expect:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-- The CXX compiler identification is MSVC 18.0.31101.0<o:p></o:p></p>
<p class="MsoNormal">-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 12.0/VC/bin/amd64/cl.exe<o:p></o:p></p>
<p class="MsoNormal">-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 12.0/VC/bin/amd64/cl.exe -- works<o:p></o:p></p>
<p class="MsoNormal">-- Detecting CXX compiler ABI info<o:p></o:p></p>
<p class="MsoNormal">-- Detecting CXX compiler ABI info - done<o:p></o:p></p>
<p class="MsoNormal">C++: C:/Program Files (x86)/Microsoft Visual Studio 12.0/VC/bin/amd64/cl.exe<o:p></o:p></p>
<p class="MsoNormal">-- Configuring done<o:p></o:p></p>
<p class="MsoNormal">-- Generating done<o:p></o:p></p>
<p class="MsoNormal">-- Build files have been written to: C:/Users/dbarnett/cmc/other<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Namely, it finds C:/Program…./amd64/cl.exe.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve looked through the CMake Modules, but I could not really find the place where CMake derives the value for CMAKE_CXX_COMPILER when you generate a VS project. Could someone point me to the source code where this occurs? I would like
to see how it is coming up with this version of the compiler which isn’t even in the PATH.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Allen<o:p></o:p></p>
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