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CMake/Modules/CheckLanguage.cmake

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Simplify CMake per-source license notices Per-source copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong. Precise contributor information is already maintained automatically by the version control tool. Ultimately it is the receiver of a file who is responsible for determining its licensing status, and per-source notices are merely a convenience. Therefore it is simpler and more accurate for each source to have a generic notice of the license name and references to more detailed information on copyright holders and full license terms. Our `Copyright.txt` file now contains a list of Contributors whose names appeared source-level copyright notices. It also references version control history for more precise information. Therefore we no longer need to spell out the list of Contributors in each source file notice. Replace CMake per-source copyright/license notice headers with a short description of the license and links to `Copyright.txt` and online information available from "https://cmake.org/licensing". The online URL also handles cases of modules being copied out of our source into other projects, so we can drop our notices about replacing links with full license text. Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority of the replacements mechanically. Manually fix up shebang lines and trailing newlines in a few files. Manually update the notices in a few files that the script does not handle.
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
Convert builtin help to reStructuredText source files Run the convert-help.bash script to convert documentation: ./convert-help.bash "/path/to/CMake-build/bin" Then remove it.
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#.rst:
# CheckLanguage
# -------------
#
# Check if a language can be enabled
#
Add CheckLanguage module Define a "check_language(<lang>)" macro to test whether <lang> can be enabled. Cache the result in CMAKE_<lang>_COMPILER. Add a test case covering expected results.
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# Usage:
Convert builtin help to reStructuredText source files Run the convert-help.bash script to convert documentation: ./convert-help.bash "/path/to/CMake-build/bin" Then remove it.
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#
# ::
#
# check_language(<lang>)
#
Add CheckLanguage module Define a "check_language(<lang>)" macro to test whether <lang> can be enabled. Cache the result in CMAKE_<lang>_COMPILER. Add a test case covering expected results.
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# 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
Convert builtin help to reStructuredText source files Run the convert-help.bash script to convert documentation: ./convert-help.bash "/path/to/CMake-build/bin" Then remove it.
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# compiler that was found, or NOTFOUND if the language cannot be
# enabled.
Add CheckLanguage module Define a "check_language(<lang>)" macro to test whether <lang> can be enabled. Cache the result in CMAKE_<lang>_COMPILER. Add a test case covering expected results.
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#
# Example:
Convert builtin help to reStructuredText source files Run the convert-help.bash script to convert documentation: ./convert-help.bash "/path/to/CMake-build/bin" Then remove it.
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#
# ::
#
# check_language(Fortran)
# if(CMAKE_Fortran_COMPILER)
# enable_language(Fortran)
# else()
# message(STATUS "No Fortran support")
# endif()
Add CheckLanguage module Define a "check_language(<lang>)" macro to test whether <lang> can be enabled. Cache the result in CMAKE_<lang>_COMPILER. Add a test case covering expected results.
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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"
Keep cmake_minimum_required calls in sync with current version Update cmake_minimum_required calls in CMakeLists.txt in Modules and in CMakeLists.txt generated by other modules, so that they are always in sync with current CMake version.
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"cmake_minimum_required(VERSION ${CMAKE_VERSION})
Add CheckLanguage module Define a "check_language(<lang>)" macro to test whether <lang> can be enabled. Cache the result in CMAKE_<lang>_COMPILER. Add a test case covering expected results.
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project(Check${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()