CheckCCompilerFlag¶
Check whether the C compiler supports a given flag.
-
check_c_compiler_flag¶ check_c_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_c_source_compiles macro from the
CheckCSourceCompiles 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_C_FLAGS, unknown flags
in such variables may cause a false negative for this check.