# - Try to find the Clang/LLVM executable

# Once done this will define

#

#  CLANG_FOUND       - system has Clang

#  CLANG_VERSION     - Clang version

#  CLANG_EXECUTABLE  - Clang executable

#

# Copyright (c) 2013, Vittorio Giovara <vittorio.giovara@gmail.com>

#

# Redistribution and use is allowed according to the terms of the BSD license.

# For details see the accompanying COPYING-CMAKE-SCRIPTS file.

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)

if (CLANG_EXECUTABLE)

    execute_process(COMMAND ${CLANG_EXECUTABLE} --version

                    OUTPUT_VARIABLE CLANG_VERSION_OUTPUT

                    ERROR_VARIABLE CLANG_VERSION_ERROR

                    RESULT_VARIABLE CLANG_VERSION_RESULT

                    OUTPUT_STRIP_TRAILING_WHITESPACE

                    )

    if(${CLANG_VERSION_RESULT} EQUAL 0)

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

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

    else()

        message(SEND_ERROR "Command \"${CLANG_EXECUTABLE} --version\" failed with output: ${CLANG_VERSION_ERROR}")

    endif()

endif()

include(FindPackageHandleStandardArgs)

find_package_handle_standard_args(Clang DEFAULT_MSG CLANG_EXECUTABLE CLANG_VERSION)

mark_as_advanced(CLANG_VERSION)