summaryrefslogtreecommitdiff
path: root/Modules/CheckOBJCCompilerFlag.cmake
blob: d8d874175fd3ceabd86a775fa441537ece67001f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
CheckOBJCCompilerFlag
---------------------

.. versionadded:: 3.16

Check whether the Objective-C compiler supports a given flag.

.. command:: check_objc_compiler_flag

  .. code-block:: cmake

    check_objc_compiler_flag(<flag> <var>)

  Check that the ``<flag>`` is accepted by the compiler without
  a diagnostic.  Stores the result in an internal cache entry
  named ``<var>``.

This command temporarily sets the ``CMAKE_REQUIRED_DEFINITIONS`` variable
and calls the ``check_objc_source_compiles`` macro from the
:module:`CheckOBJCSourceCompiles` module.  See documentation of that
module for a listing of variables that can otherwise modify the build.

A positive result from this check indicates only that the compiler did not
issue a diagnostic message when given the flag.  Whether the flag has any
effect or even a specific one is beyond the scope of this module.

.. note::
  Since the :command:`try_compile` command forwards flags from variables
  like :variable:`CMAKE_OBJC_FLAGS <CMAKE_<LANG>_FLAGS>`, unknown flags
  in such variables may cause a false negative for this check.
#]=======================================================================]

include_guard(GLOBAL)
include(CheckOBJCSourceCompiles)
include(Internal/CheckCompilerFlag)

macro (CHECK_OBJC_COMPILER_FLAG _FLAG _RESULT)
  cmake_check_compiler_flag(OBJC "${_FLAG}" ${_RESULT})
endmacro ()