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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. 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 compiler 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 ``<code>`` must contain a valid main program. For example:
.. code-block:: cmake
check_source_compiles(C
"#include <stdlib.h>
#include <stdnoreturn.h>
noreturn void f(){ exit(0); }
int main(void) { f(); return 1; }"
HAVE_NORETURN)
check_source_compiles(Fortran
"program test
error stop
end program"
HAVE_ERROR_STOP)
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)
include(Internal/CheckSourceCompiles)
function(CHECK_SOURCE_COMPILES _lang _source _var)
cmake_check_source_compiles(${_lang} "${_source}" ${_var} ${ARGN})
endfunction()
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