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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.
#[=======================================================================[.rst:
CheckSourceCompiles
----------------------
.. versionadded:: 3.19
Check if given source compiles and links into an executable.
.. command:: check_source_compiles
.. code-block:: cmake
check_source_compiles(<lang> <code> <resultVar>
[FAIL_REGEX <regex1> [<regex2>...]]
[SRC_EXT <extension>])
Check that the source supplied in ``<code>`` can be compiled as a source
file for the requested language and linked as an executable (so it must
contain at least a ``main()`` function). The result will be stored in the
internal cache variable specified by ``<resultVar>``, with a boolean true
value for success and boolean false for failure. If ``FAIL_REGEX`` is
provided, then failure is determined by checking if anything in the output
matches any of the specified regular expressions.
By default, the test source file will be given a file extension that matches
the requested language. The ``SRC_EXT`` option can be used to override this
with ``.<extension>`` instead.
The underlying check is performed by the :command:`try_compile` command. The
compile and link commands can be influenced by setting any of the following
variables prior to calling ``check_source_compiles()``:
``CMAKE_REQUIRED_FLAGS``
Additional flags to pass to the compiler. Note that the contents of
:variable:`CMAKE_<LANG>_FLAGS <CMAKE_<LANG>_FLAGS>` and its associated
configuration-specific variable are automatically added to the compiler
command before the contents of ``CMAKE_REQUIRED_FLAGS``.
``CMAKE_REQUIRED_DEFINITIONS``
A :ref:`;-list <CMake Language Lists>` of compiler definitions of the form
``-DFOO`` or ``-DFOO=bar``. A definition for the name specified by
``<resultVar>`` will also be added automatically.
``CMAKE_REQUIRED_INCLUDES``
A :ref:`;-list <CMake Language Lists>` of header search paths to pass to
the compiler. These will be the only header search paths used by
``try_compile()``, i.e. the contents of the :prop_dir:`INCLUDE_DIRECTORIES`
directory property will be ignored.
``CMAKE_REQUIRED_LINK_OPTIONS``
A :ref:`;-list <CMake Language Lists>` of options to add to the link
command (see :command:`try_compile` for further details).
``CMAKE_REQUIRED_LIBRARIES``
A :ref:`;-list <CMake Language Lists>` of libraries to add to the link
command. These can be the name of system libraries or they can be
:ref:`Imported Targets <Imported Targets>` (see :command:`try_compile` for
further details).
``CMAKE_REQUIRED_QUIET``
If this variable evaluates to a boolean true value, all status messages
associated with the check will be suppressed.
The check is only performed once, with the result cached in the variable
named by ``<resultVar>``. Every subsequent CMake run will re-use this cached
value rather than performing the check again, even if the ``<code>`` changes.
In order to force the check to be re-evaluated, the variable named by
``<resultVar>`` must be manually removed from the cache.
#]=======================================================================]
include_guard(GLOBAL)
cmake_policy(PUSH)
cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
cmake_policy(SET CMP0057 NEW) # if() supports IN_LIST
function(CHECK_SOURCE_COMPILES _lang _source _var)
if(NOT DEFINED "${_var}")
if(_lang STREQUAL C)
set(_lang_textual "C")
set(_lang_ext "c")
elseif(_lang STREQUAL CXX)
set(_lang_textual "C++")
set(_lang_ext "cxx")
elseif(_lang STREQUAL Fortran)
set(_lang_textual "Fortran")
set(_lang_ext "F")
elseif(_lang STREQUAL OBJC)
set(_lang_textual "Objective-C")
set(_lang_ext "m")
elseif(_lang STREQUAL OBJCXX)
set(_lang_textual "Objective-C++")
set(_lang_ext "mm")
else()
message (SEND_ERROR "check_source_compiles: ${_lang}: unknown language.")
return()
endif()
get_property (_supported_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
if (NOT _lang IN_LIST _supported_languages)
message (SEND_ERROR "check_source_compiles: ${_lang}: needs to be enabled before use.")
return()
endif()
set(_FAIL_REGEX)
set(_SRC_EXT)
set(_key)
foreach(arg ${ARGN})
if("${arg}" MATCHES "^(FAIL_REGEX|SRC_EXT)$")
set(_key "${arg}")
elseif(_key)
list(APPEND _${_key} "${arg}")
else()
message(FATAL_ERROR "Unknown argument:\n ${arg}\n")
endif()
endforeach()
if(NOT _SRC_EXT)
set(_SRC_EXT ${_lang_ext})
endif()
if(CMAKE_REQUIRED_LINK_OPTIONS)
set(CHECK_${LANG}_SOURCE_COMPILES_ADD_LINK_OPTIONS
LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
else()
set(CHECK_${LANG}_SOURCE_COMPILES_ADD_LINK_OPTIONS)
endif()
if(CMAKE_REQUIRED_LIBRARIES)
set(CHECK_${LANG}_SOURCE_COMPILES_ADD_LIBRARIES
LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
else()
set(CHECK_${LANG}_SOURCE_COMPILES_ADD_LIBRARIES)
endif()
if(CMAKE_REQUIRED_INCLUDES)
set(CHECK_${LANG}_SOURCE_COMPILES_ADD_INCLUDES
"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
else()
set(CHECK_${LANG}_SOURCE_COMPILES_ADD_INCLUDES)
endif()
file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.${_SRC_EXT}"
"${_source}\n")
if(NOT CMAKE_REQUIRED_QUIET)
message(CHECK_START "Performing Test ${_var}")
endif()
try_compile(${_var}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.${_SRC_EXT}
COMPILE_DEFINITIONS -D${_var} ${CMAKE_REQUIRED_DEFINITIONS}
${CHECK_${LANG}_SOURCE_COMPILES_ADD_LINK_OPTIONS}
${CHECK_${LANG}_SOURCE_COMPILES_ADD_LIBRARIES}
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CMAKE_REQUIRED_FLAGS}
"${CHECK_${LANG}_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(CHECK_PASS "Success")
endif()
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Performing ${_lang_textual} SOURCE FILE Test ${_var} succeeded with the following output:\n"
"${OUTPUT}\n"
"Source file was:\n${_source}\n")
else()
if(NOT CMAKE_REQUIRED_QUIET)
message(CHECK_FAIL "Failed")
endif()
set(${_var} "" CACHE INTERNAL "Test ${_var}")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Performing ${_lang_textual} SOURCE FILE Test ${_var} failed with the following output:\n"
"${OUTPUT}\n"
"Source file was:\n${_source}\n")
endif()
endif()
endfunction()
cmake_policy(POP)
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