#.rst: # CheckCXXSourceCompiles # ---------------------- # # Check if given C++ source compiles and links into an executable # # CHECK_CXX_SOURCE_COMPILES(<code> <var> [FAIL_REGEX <fail-regex>]) # # :: # # <code> - source code to try to compile, must define 'main' # <var> - variable to store whether the source code compiled # Will be created as an internal cache variable. # <fail-regex> - fail if test output matches this regex # # The following variables may be set before calling this macro to modify # the way the check is run: # # :: # # CMAKE_REQUIRED_FLAGS = string of compile command line flags # CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) # CMAKE_REQUIRED_INCLUDES = list of include directories # CMAKE_REQUIRED_LIBRARIES = list of libraries to link # CMAKE_REQUIRED_QUIET = execute quietly without messages #============================================================================= # Copyright 2005-2009 Kitware, Inc. # # Distributed under the OSI-approved BSD License (the "License"); # see accompanying file Copyright.txt for details. # # This software is distributed WITHOUT ANY WARRANTY; without even the # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # See the License for more information. #============================================================================= # (To distribute this file outside of CMake, substitute the full # License text for the above reference.) macro(CHECK_CXX_SOURCE_COMPILES SOURCE VAR) if(NOT DEFINED "${VAR}") set(_FAIL_REGEX) set(_key) foreach(arg ${ARGN}) if("${arg}" MATCHES "^(FAIL_REGEX)$") set(_key "${arg}") elseif(_key) list(APPEND _${_key} "${arg}") else() message(FATAL_ERROR "Unknown argument:\n ${arg}\n") endif() endforeach() set(MACRO_CHECK_FUNCTION_DEFINITIONS "-D${VAR} ${CMAKE_REQUIRED_FLAGS}") if(CMAKE_REQUIRED_LIBRARIES) set(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}) else() set(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES) endif() if(CMAKE_REQUIRED_INCLUDES) set(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}") else() set(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES) endif() file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx" "${SOURCE}\n") if(NOT CMAKE_REQUIRED_QUIET) message(STATUS "Performing Test ${VAR}") endif() try_compile(${VAR} ${CMAKE_BINARY_DIR} ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} ${CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES} CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS} "${CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES}" OUTPUT_VARIABLE OUTPUT) foreach(_regex ${_FAIL_REGEX}) if("${OUTPUT}" MATCHES "${_regex}") set(${VAR} 0) endif() endforeach() if(${VAR}) set(${VAR} 1 CACHE INTERNAL "Test ${VAR}") if(NOT CMAKE_REQUIRED_QUIET) message(STATUS "Performing Test ${VAR} - Success") endif() file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log "Performing C++ SOURCE FILE Test ${VAR} succeded with the following output:\n" "${OUTPUT}\n" "Source file was:\n${SOURCE}\n") else() if(NOT CMAKE_REQUIRED_QUIET) message(STATUS "Performing Test ${VAR} - Failed") endif() set(${VAR} "" CACHE INTERNAL "Test ${VAR}") file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log "Performing C++ SOURCE FILE Test ${VAR} failed with the following output:\n" "${OUTPUT}\n" "Source file was:\n${SOURCE}\n") endif() endif() endmacro()