RawTherapee compile on macOS Mojave with llvm@8

# Install llvm@8

brew install llvm@8

# Clone the repo

cd <some directory>
git clone git@github.com:Beep6581/RawTherapee.git
cd RawTherapee

# If necessary, clean the build folder

cd build
make -j$(sysctl -n hw.ncpu) clean
# rm -rf ./*

# Run cmake per the template on http://rawpedia.rawtherapee.com/MacOS with the appropriate paths

cd <RawTherapee source root>
mkdir -p build && cd build

export PKG_CONFIG_PATH=/usr/local/opt/libffi/lib/pkgconfig:/usr/local/opt/expat/lib/pkgconfig && \
export LDFLAGS="-L/usr/local/opt/llvm@8/lib" && \
export CPPFLAGS="-I/usr/local/opt/llvm@8/include" && \
cmake  .. -DCMAKE_BUILD_TYPE="release" \
          -DPROC_TARGET_NUMBER="2" \
          -DCACHE_NAME_SUFFIX="5.8-dev" \
          -DCMAKE_C_COMPILER="/usr/local/opt/llvm@8/bin/clang" \
          -DCMAKE_CXX_COMPILER="/usr/local/opt/llvm@8/bin/clang++" \
          -DWITH_LTO="ON" \
          -DLENSFUNDBDIR="/Applications/RawTherapee.app/Contents/Resources/share/lensfun" \
          -DCMAKE_BUILD_TYPE=Release \
          -DOpenMP_C_FLAGS=-fopenmp=libomp \
          -DOpenMP_CXX_FLAGS=-fopenmp=libomp \
          -DOpenMP_C_LIB_NAMES="libomp" \
          -DOpenMP_CXX_LIB_NAMES="libomp" \
          -DOpenMP_libomp_LIBRARY="/usr/local/lib/libomp.dylib" \
          -DOpenMP_CXX_FLAGS="-Wno-pass-failed -Wno-deprecated-register -Xpreprocessor -fopenmp /usr/local/lib/libomp.dylib -I/usr/local/include" \
          -DOpenMP_CXX_LIB_NAMES="libomp" \
          -DOpenMP_C_FLAGS="-Wno-pass-failed -Wno-deprecated-register -Xpreprocessor -fopenmp /usr/local/lib/libomp.dylib -I/usr/local/include" \
          -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON \
          -DCMAKE_EXE_LINKER_FLAGS="-L/usr/local/opt/libffi/lib -L/usr/local/lib" \
          -DCMAKE_AR="/usr/local/opt/llvm@8/bin/llvm-ar" \
          -DCMAKE_RANLIB="/usr/local/opt/llvm@8/bin/llvm-ranlib"
          
# Run make

make -j$(sysctl -n hw.ncpu) install

# At this point the build/Release folder should contain the build binaries.
# These should be placed under `/Applications/RawTherapee.app/Contents` in order for the app to find the resources.
# If the distributed app is there, its folder can be renamed so it still should work in parallel but it will use the mentioned folder
# for the resources, so there may be conflicts.