You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
2.6 KiB
65 lines
2.6 KiB
# 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 ()
|