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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#.rst:
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# CheckLanguage
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# -------------
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#
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# Check if a language can be enabled
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#
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# Usage:
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#
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# ::
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#
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# check_language(<lang>)
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#
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# where <lang> is a language that may be passed to enable_language()
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# such as "Fortran". If CMAKE_<lang>_COMPILER is already defined the
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# check does nothing. Otherwise it tries enabling the language in a
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# test project. The result is cached in CMAKE_<lang>_COMPILER as the
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# compiler that was found, or NOTFOUND if the language cannot be
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# enabled.
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#
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# Example:
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#
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# ::
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#
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# check_language(Fortran)
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# if(CMAKE_Fortran_COMPILER)
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# enable_language(Fortran)
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# else()
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# message(STATUS "No Fortran support")
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# endif()
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macro(check_language lang)
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if(NOT DEFINED CMAKE_${lang}_COMPILER)
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set(_desc "Looking for a ${lang} compiler")
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message(STATUS ${_desc})
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file(REMOVE_RECURSE ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang})
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file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}/CMakeLists.txt"
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"cmake_minimum_required(VERSION ${CMAKE_VERSION})
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project(Check${lang} ${lang})
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file(WRITE \"\${CMAKE_CURRENT_BINARY_DIR}/result.cmake\"
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\"set(CMAKE_${lang}_COMPILER \\\"\${CMAKE_${lang}_COMPILER}\\\")\\n\"
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)
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")
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execute_process(
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WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}
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COMMAND ${CMAKE_COMMAND} . -G ${CMAKE_GENERATOR}
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-A "${CMAKE_GENERATOR_PLATFORM}"
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-T "${CMAKE_GENERATOR_TOOLSET}"
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OUTPUT_VARIABLE output
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ERROR_VARIABLE output
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RESULT_VARIABLE result
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)
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include(${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}/result.cmake OPTIONAL)
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if(CMAKE_${lang}_COMPILER AND "${result}" STREQUAL "0")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"${_desc} passed with the following output:\n"
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"${output}\n")
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else()
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set(CMAKE_${lang}_COMPILER NOTFOUND)
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"${_desc} failed with the following output:\n"
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"${output}\n")
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endif()
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message(STATUS "${_desc} - ${CMAKE_${lang}_COMPILER}")
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set(CMAKE_${lang}_COMPILER "${CMAKE_${lang}_COMPILER}" CACHE FILEPATH "${lang} compiler")
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mark_as_advanced(CMAKE_${lang}_COMPILER)
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endif()
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endmacro()
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