| # Distributed under the OSI-approved BSD 3-Clause License. See accompanying |
| # file Copyright.txt or https://cmake.org/licensing for details. |
| |
| #[=======================================================================[.rst: |
| CheckLanguage |
| ------------- |
| |
| Check if a language can be enabled |
| |
| Usage: |
| |
| :: |
| |
| check_language(<lang>) |
| |
| where ``<lang>`` is a language that may be passed to :command:`enable_language` |
| such as ``Fortran``. If :variable:`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 :variable:`CMAKE_<LANG>_COMPILER` |
| as the compiler that was found, or ``NOTFOUND`` if the language cannot be |
| enabled. For CUDA which can have an explicit host compiler, the cache |
| :variable:`CMAKE_CUDA_HOST_COMPILER` variable will be set if it was required |
| for compilation. |
| |
| Example: |
| |
| :: |
| |
| check_language(Fortran) |
| if(CMAKE_Fortran_COMPILER) |
| enable_language(Fortran) |
| else() |
| message(STATUS "No Fortran support") |
| endif() |
| #]=======================================================================] |
| |
| include_guard(GLOBAL) |
| |
| macro(check_language lang) |
| if(NOT DEFINED CMAKE_${lang}_COMPILER) |
| set(_desc "Looking for a ${lang} compiler") |
| message(CHECK_START "${_desc}") |
| file(REMOVE_RECURSE ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}) |
| |
| set(extra_compiler_variables) |
| if(${lang} STREQUAL CUDA) |
| set(extra_compiler_variables "set(CMAKE_CUDA_HOST_COMPILER \\\"\${CMAKE_CUDA_HOST_COMPILER}\\\")") |
| endif() |
| |
| set(_cl_content |
| "cmake_minimum_required(VERSION ${CMAKE_VERSION}) |
| project(Check${lang} ${lang}) |
| file(WRITE \"\${CMAKE_CURRENT_BINARY_DIR}/result.cmake\" |
| \"set(CMAKE_${lang}_COMPILER \\\"\${CMAKE_${lang}_COMPILER}\\\")\\n\" |
| \"${extra_compiler_variables}\\n\" |
| )" |
| ) |
| |
| file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}/CMakeLists.txt" |
| "${_cl_content}") |
| if(CMAKE_GENERATOR_INSTANCE) |
| set(_D_CMAKE_GENERATOR_INSTANCE "-DCMAKE_GENERATOR_INSTANCE:INTERNAL=${CMAKE_GENERATOR_INSTANCE}") |
| else() |
| set(_D_CMAKE_GENERATOR_INSTANCE "") |
| endif() |
| if(CMAKE_GENERATOR MATCHES "^(Xcode$|Green Hills MULTI$|Visual Studio)") |
| set(_D_CMAKE_MAKE_PROGRAM "") |
| else() |
| set(_D_CMAKE_MAKE_PROGRAM "-DCMAKE_MAKE_PROGRAM:FILEPATH=${CMAKE_MAKE_PROGRAM}") |
| endif() |
| execute_process( |
| WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang} |
| COMMAND ${CMAKE_COMMAND} . -G ${CMAKE_GENERATOR} |
| -A "${CMAKE_GENERATOR_PLATFORM}" |
| -T "${CMAKE_GENERATOR_TOOLSET}" |
| ${_D_CMAKE_GENERATOR_INSTANCE} |
| ${_D_CMAKE_MAKE_PROGRAM} |
| OUTPUT_VARIABLE _cl_output |
| ERROR_VARIABLE _cl_output |
| RESULT_VARIABLE _cl_result |
| ) |
| include(${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}/result.cmake OPTIONAL) |
| if(CMAKE_${lang}_COMPILER AND "${_cl_result}" STREQUAL "0") |
| file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log |
| "${_desc} passed with the following output:\n" |
| "${_cl_output}\n") |
| set(_CHECK_COMPILER_STATUS CHECK_PASS) |
| else() |
| set(CMAKE_${lang}_COMPILER NOTFOUND) |
| set(_CHECK_COMPILER_STATUS CHECK_FAIL) |
| file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log |
| "${_desc} failed with the following output:\n" |
| "${_cl_output}\n") |
| endif() |
| message(${_CHECK_COMPILER_STATUS} "${CMAKE_${lang}_COMPILER}") |
| set(CMAKE_${lang}_COMPILER "${CMAKE_${lang}_COMPILER}" CACHE FILEPATH "${lang} compiler") |
| mark_as_advanced(CMAKE_${lang}_COMPILER) |
| |
| if(CMAKE_${lang}_HOST_COMPILER) |
| message(STATUS "Looking for a ${lang} host compiler - ${CMAKE_${lang}_HOST_COMPILER}") |
| set(CMAKE_${lang}_HOST_COMPILER "${CMAKE_${lang}_HOST_COMPILER}" CACHE FILEPATH "${lang} host compiler") |
| mark_as_advanced(CMAKE_${lang}_HOST_COMPILER) |
| endif() |
| |
| endif() |
| endmacro() |