1 # Load LLVM/Clang

     2 IF (CLANG)

     3     SET(CLANG_EXECUTABLE ${CLANG})

     4 ELSE()

     5     FIND_PROGRAM(CLANG_EXECUTABLE

     6         NAMES clang-mp-3.2 clang-mp-3.1 clang-mp-3.0 clang

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

     8 ENDIF()

     9 

    10 # Check LLVM/Clang version

    11 IF (CLANG_EXECUTABLE)

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

    13 

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

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

    16 

    17     # Required that LLVM/Clang version is >= 3.0

    18     IF (CLANG_VERSION VERSION_GREATER 3.0 OR CLANG_VERSION VERSION_EQUAL 3.0)

    19         MESSAGE(STATUS "Found CLANG: ${CLANG_EXECUTABLE} (version ${CLANG_VERSION})")

    20     ELSE()

    21         MESSAGE(FATAL_ERROR "Necessary LLVM/Clang version not found (version >= 3.0 required)")

    22     ENDIF()

    23 ELSE()

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

    25 ENDIF()

    26 

    27 SET(CMAKE_C_COMPILER ${CLANG_EXECUTABLE})