Merge branch 'release-4.0'
[kiteware-cmake.git] / Modules / CheckCSourceCompiles.cmake
blob74c54fa3161006e21b6fedcb3b27f97df11793bf
1 # Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
2 # file Copyright.txt or https://cmake.org/licensing for details.
4 #[=======================================================================[.rst:
5 CheckCSourceCompiles
6 --------------------
8 Check once if C source code can be built.
10 .. command:: check_c_source_compiles
12   .. code-block:: cmake
14     check_c_source_compiles(<code> <resultVar>
15                             [FAIL_REGEX <regex1> [<regex2>...]])
17   Check once that the source supplied in ``<code>`` can be built. The result is
18   stored in the internal cache variable specified by ``<resultVar>``, with
19   boolean ``true`` for success and boolean ``false`` for failure.
21   If ``FAIL_REGEX`` is provided, then failure is determined by checking
22   if anything in the compiler output matches any of the specified regular
23   expressions.
25   Internally, :command:`try_compile` is used to compile the source. If
26   :variable:`CMAKE_TRY_COMPILE_TARGET_TYPE` is set to ``EXECUTABLE`` (default),
27   the source is compiled and linked as an executable program. If set to
28   ``STATIC_LIBRARY``, the source is compiled but not linked. In any case, all
29   functions must be declared as usual.
31   See also :command:`check_source_compiles` for a more general command syntax.
33   See also :command:`check_source_runs` to run compiled source.
35   The compile and link commands can be influenced by setting any of the
36   following variables prior to calling ``check_c_source_compiles()``:
38 .. include:: /module/CMAKE_REQUIRED_FLAGS.txt
40 .. include:: /module/CMAKE_REQUIRED_DEFINITIONS.txt
42 .. include:: /module/CMAKE_REQUIRED_INCLUDES.txt
44 .. include:: /module/CMAKE_REQUIRED_LINK_OPTIONS.txt
46 .. include:: /module/CMAKE_REQUIRED_LIBRARIES.txt
48 .. include:: /module/CMAKE_REQUIRED_LINK_DIRECTORIES.txt
50 .. include:: /module/CMAKE_REQUIRED_QUIET.txt
52 #]=======================================================================]
54 include_guard(GLOBAL)
55 include(Internal/CheckSourceCompiles)
57 macro(CHECK_C_SOURCE_COMPILES SOURCE VAR)
58   cmake_check_source_compiles(C "${SOURCE}" ${VAR} ${ARGN})
59 endmacro()