- execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE)
- message(STATUS "Using GCC version ${GCC_VERSION}")
- if(GCC_VERSION VERSION_LESS 4.9)
+ if (CMAKE_CXX_COMPILER_ID MATCHES "^([cC]lang|AppleClang)$")
+ # ignore the GCC_VERSION for clang
+ # and use the resulting CXX11_STD_REGEX found in FindCXX11Compiler.cmake
+ message(STATUS "Using clang")
+ if(CXX11_STD_REGEX)
+ set(LYX_USE_STD_REGEX 1)
+ else()
+ set(LYX_USE_STD_REGEX 0)
+ endif()
+ else()
+ execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpfullversion OUTPUT_VARIABLE GCC_VERSION ERROR_VARIABLE _error RESULT_VARIABLE _err OUTPUT_STRIP_TRAILING_WHITESPACE)
+ #message(STATUS "dumpfullversion: error = ${_error}, result = ${_err}")
+ if (_err)
+ # previous check failed, try again with _old_ parameter
+ execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION ERROR_VARIABLE _error RESULT_VARIABLE _err OUTPUT_STRIP_TRAILING_WHITESPACE)
+ #message(STATUS "dumpversion: error = ${_error}, result = ${_err}")
+ endif()
+ message(STATUS "Using GCC version ${GCC_VERSION}")
+ if(GCC_VERSION VERSION_LESS 4.6)
+ message(FATAL_ERROR "gcc >= 4.6 is required.")
+ elseif(GCC_VERSION VERSION_LESS 4.9)