# Load LLVM/Clang

if (CLANG)

    set(CLANG_EXECUTABLE ${CLANG})

else()

    find_program(CLANG_EXECUTABLE

        NAMES clang-mp-3.3 clang-mp-3.2 clang-mp-3.1 clang-mp-3.0 clang

        PATHS /opt/local/bin /usr/local/bin /usr/bin)

endif()

# Check LLVM/Clang version

if (CLANG_EXECUTABLE)

    exec_program(${CLANG_EXECUTABLE} ARGS "-v" OUTPUT_VARIABLE CLANG_VERSION_FULL)

    string(REGEX MATCH "[0-9]+\\.[0-9]+" CLANG_VERSION_LONG "${CLANG_VERSION_FULL}")

    string(REGEX REPLACE "([0-9]+\\.[0-9]+)" "\\1" CLANG_VERSION "${CLANG_VERSION_LONG}")

else()

    message(FATAL_ERROR "No LLVM/Clang compiler found (required for engine_c target)")

endif()

set(CMAKE_C_COMPILER ${CLANG_EXECUTABLE})

set(CMAKE_CXX_COMPILER ${CLANG_EXECUTABLE})