blob: 1d975da882d7e0ff234e60325a13192cc4b805d4 (
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
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
CheckOBJCCompilerFlag
---------------------
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(CMakeCheckCompilerFlagCommonPatterns)
macro (CHECK_OBJC_COMPILER_FLAG _FLAG _RESULT)
set(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}")
set(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
# Normalize locale during test compilation.
set(_CheckOBJCCompilerFlag_LOCALE_VARS LC_ALL LC_MESSAGES LANG)
foreach(v ${_CheckOBJCCompilerFlag_LOCALE_VARS})
set(_CheckOBJCCompilerFlag_SAVED_${v} "$ENV{${v}}")
set(ENV{${v}} OBJC)
endforeach()
CHECK_COMPILER_FLAG_COMMON_PATTERNS(_CheckOBJCCompilerFlag_COMMON_PATTERNS)
CHECK_OBJC_SOURCE_COMPILES("#ifndef __OBJC__\n# error \"Not an Objective-C compiler\"\n#endif\nint main(void) { return 0; }" ${_RESULT}
# Some compilers do not fail with a bad flag
FAIL_REGEX "command line option .* is valid for .* but not for Objective-C" # GNU
FAIL_REGEX "argument unused during compilation: .*" # Clang
${_CheckOBJCCompilerFlag_COMMON_PATTERNS}
)
foreach(v ${_CheckOBJCCompilerFlag_LOCALE_VARS})
set(ENV{${v}} ${_CheckOBJCCompilerFlag_SAVED_${v}})
unset(_CheckOBJCCompilerFlag_SAVED_${v})
endforeach()
unset(_CheckOBJCCompilerFlag_LOCALE_VARS)
unset(_CheckOBJCCompilerFlag_COMMON_PATTERNS)
set (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
endmacro ()
|
