Build Clang/LLVM from source on Ubuntu

Steps to build clang/llvm and related tools on linux for Hipacc.

Clone source code

1. clone llvm

    git clone git@github.com:llvm-mirror/llvm
   

2. clone compiler-rt, polly, libcxx, libcxxabi

    cd projects/
    git clone git@github.com:llvm-mirror/compiler-rt
    git clone git@github.com:llvm-mirror/polly
    git clone git@github.com:llvm-mirror/libcxx
    git clone git@github.com:llvm-mirror/libcxxabi
    cd ..
   

3. clone Clang

    cd tools/
    git clone git@github.com:llvm-mirror/clang
   

4. clone Clang toolings

    cd clang/
    cd tools/
    git clone git@github.com:llvm-mirror/clang-tools-extra extra
    cd ../../../
   

   Note that name here must be extra for clang toolings.

5. git checkout the same release version for the cloned source code

Build source code

1. Create a build directory. Building LLVM in the source directory is not supported. cd to this directory:

    mkdir build
    cd build
   

2. Use CMake to generate build files, optionally it is possible to set a different install prefix

    cmake path/to/llvm/source/root -DCMAKE_INSTALL_PREFIX=/custom/bin/llvm
   

3. Build and install the binary

    cmake --build .
    cmake --build . --target install