Building Clang from source

If you would like to build Clang (and lld) from source for testing purposes, it is really easy! You should have cmake and ninja installed from your distribution.

$ git clone git://github.com/llvm/llvm-project
$ cd llvm-project
$ mkdir build
$ cd build
$ cmake -G Ninja \
        -DCMAKE_BUILD_TYPE=Release \
        -DLLVM_ENABLE_PROJECTS="clang;lld;compiler-rt" \
        -DLLVM_ENABLE_WARNINGS=OFF \
        ../llvm
$ ninja

If you would like a slightly more optimized clang binary and quicker compile times, use our tc-build repo:

$ git clone git://github.com/ClangBuiltLinux/tc-build
$ cd tc-build
$ ./build-llvm.py

Please see that repo's README for more information.