CheckCompilerFlag¶
New in version 3.19.
Check whether the compiler supports a given flag.
- check_compiler_flag¶
check_compiler_flag(<lang> <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_source_compiles(<LANG>)
function from the
CheckSourceCompiles
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 try_compile()
command forwards flags from variables
like CMAKE_<LANG>_FLAGS
, unknown flags
in such variables may cause a false negative for this check.