CheckOBJCCompilerFlag¶
Added in version 3.16.
Check whether the Objective-C compiler supports a given flag.
- check_objc_compiler_flag¶
check_objc_compiler_flag(<flag> <resultVar>)
Check that the
<flag>is accepted by the compiler without a diagnostic. Stores the result in an internal cache entry named<resultVar>.
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.
The check is only performed once, with the result cached in the variable named
by <resultVar>. Every subsequent CMake run will reuse 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.
The compile and link commands can be influenced by setting any of the
following variables prior to calling check_objc_compiler_flag()
CMAKE_REQUIRED_FLAGSString of additional flags to pass to the compiler. The string must be space-delimited--a ;-list will not work. The contents of
CMAKE_<LANG>_FLAGSand its associated configuration-specific variable are automatically added to the compiler command before the contents ofCMAKE_REQUIRED_FLAGS.
CMAKE_REQUIRED_DEFINITIONSA ;-list of compiler definitions of the form
-DFOOor-DFOO=bar. A definition for the name specified by<resultVar>will also be added automatically.
CMAKE_REQUIRED_INCLUDESA ;-list of header search paths to pass to the compiler. These will be the only header search paths used--the contents of the
INCLUDE_DIRECTORIESdirectory property will be ignored.
CMAKE_REQUIRED_LINK_OPTIONSAdded in version 3.14.
A ;-list of options to add to the link command (see
try_compile()for further details).
CMAKE_REQUIRED_LIBRARIESA ;-list of libraries to add to the link command. These can be the name of system libraries or they can be Imported Targets (see
try_compile()for further details).
CMAKE_REQUIRED_QUIETAdded in version 3.1.
If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.