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copied!<p>CMake honors the environment variables <code>CC</code> and <code>CXX</code> upon detecting the C and C++ compiler to use:</p> <pre><code>$ export CC=/usr/bin/clang $ export CXX=/usr/bin/clang++ $ cmake .. -- The C compiler identification is Clang -- The CXX compiler identification is Clang </code></pre> <p>The compiler specific flags can be overridden by putting them into a system wide CMake file and pointing the <a href="https://cmake.org/cmake/help/latest/variable/CMAKE_USER_MAKE_RULES_OVERRIDE.html" rel="noreferrer">CMAKE_USER_MAKE_RULES_OVERRIDE</a> variable to it. Create a file <code>~/ClangOverrides.txt</code> with the following contents:</p> <pre><code>SET (CMAKE_C_FLAGS_INIT "-Wall -std=c99") SET (CMAKE_C_FLAGS_DEBUG_INIT "-g") SET (CMAKE_C_FLAGS_MINSIZEREL_INIT "-Os -DNDEBUG") SET (CMAKE_C_FLAGS_RELEASE_INIT "-O4 -DNDEBUG") SET (CMAKE_C_FLAGS_RELWITHDEBINFO_INIT "-O2 -g") SET (CMAKE_CXX_FLAGS_INIT "-Wall") SET (CMAKE_CXX_FLAGS_DEBUG_INIT "-g") SET (CMAKE_CXX_FLAGS_MINSIZEREL_INIT "-Os -DNDEBUG") SET (CMAKE_CXX_FLAGS_RELEASE_INIT "-O4 -DNDEBUG") SET (CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT "-O2 -g") </code></pre> <p>The suffix _INIT will make CMake initialize the corresponding <code>*_FLAGS</code> variable with the given value. Then invoke cmake in the following way:</p> <pre><code>$ cmake -DCMAKE_USER_MAKE_RULES_OVERRIDE=~/ClangOverrides.txt .. </code></pre> <p>Finally to force the use of the LLVM binutils, set the internal variable <code>_CMAKE_TOOLCHAIN_PREFIX</code>. This variable is honored by the <code>CMakeFindBinUtils</code> module:</p> <pre><code>$ cmake -D_CMAKE_TOOLCHAIN_PREFIX=llvm- .. </code></pre> <p>Putting this all together you can write a shell wrapper which sets up the environment variables <code>CC</code> and <code>CXX</code> and then invokes cmake with the mentioned variable overrides. </p>

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