# Minimal CMake toolchain file for OS X builds.
include(CMakeForceCompiler)

set(CMAKE_SYSTEM_NAME Darwin)

execute_process(COMMAND xcrun -sdk macosx -toolchain XcodeDefault -find clang
                OUTPUT_VARIABLE cc_path
                OUTPUT_STRIP_TRAILING_WHITESPACE)
execute_process(COMMAND xcrun -sdk macosx -toolchain XcodeDefault -find clang++
                OUTPUT_VARIABLE cxx_path
                OUTPUT_STRIP_TRAILING_WHITESPACE)

CMAKE_FORCE_C_COMPILER("${cc_path}" Clang)
CMAKE_FORCE_CXX_COMPILER("${cxx_path}" Clang)

# Compiler forcing leaves the compiler version unset, which the llvm 
# build machinery doesn't like. Pacify it.
set(LLVM_FORCE_USE_OLD_TOOLCHAIN ON)