| #.rst: |
| # CheckLanguage |
| # ------------- |
| # |
| # Check if a language can be enabled |
| # |
| # Usage: |
| # |
| # :: |
| # |
| # check_language(<lang>) |
| # |
| # where <lang> is a language that may be passed to enable_language() |
| # such as "Fortran". If CMAKE_<lang>_COMPILER is already defined the |
| # check does nothing. Otherwise it tries enabling the language in a |
| # test project. The result is cached in CMAKE_<lang>_COMPILER as the |
| # compiler that was found, or NOTFOUND if the language cannot be |
| # enabled. |
| # |
| # Example: |
| # |
| # :: |
| # |
| # check_language(Fortran) |
| # if(CMAKE_Fortran_COMPILER) |
| # enable_language(Fortran) |
| # else() |
| # message(STATUS "No Fortran support") |
| # endif() |
| |
| #============================================================================= |
| # Copyright 2009-2012 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_language lang) |
| if(NOT DEFINED CMAKE_${lang}_COMPILER) |
| set(_desc "Looking for a ${lang} compiler") |
| message(STATUS ${_desc}) |
| file(REMOVE_RECURSE ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}) |
| file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}/CMakeLists.txt" |
| "cmake_minimum_required(VERSION ${CMAKE_VERSION}) |
| project(Check${lang} ${lang}) |
| file(WRITE \"\${CMAKE_CURRENT_BINARY_DIR}/result.cmake\" |
| \"set(CMAKE_${lang}_COMPILER \\\"\${CMAKE_${lang}_COMPILER}\\\")\\n\" |
| ) |
| ") |
| execute_process( |
| WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang} |
| COMMAND ${CMAKE_COMMAND} . -G ${CMAKE_GENERATOR} |
| OUTPUT_VARIABLE output |
| ERROR_VARIABLE output |
| RESULT_VARIABLE result |
| ) |
| include(${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}/result.cmake OPTIONAL) |
| if(CMAKE_${lang}_COMPILER AND "${result}" STREQUAL "0") |
| file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log |
| "${_desc} passed with the following output:\n" |
| "${output}\n") |
| else() |
| set(CMAKE_${lang}_COMPILER NOTFOUND) |
| file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log |
| "${_desc} failed with the following output:\n" |
| "${output}\n") |
| endif() |
| message(STATUS "${_desc} - ${CMAKE_${lang}_COMPILER}") |
| set(CMAKE_${lang}_COMPILER "${CMAKE_${lang}_COMPILER}" CACHE FILEPATH "${lang} compiler") |
| mark_as_advanced(CMAKE_${lang}_COMPILER) |
| endif() |
| endmacro() |