CheckFunctionExists

Check if a C function can be linked

check_function_exists

check_function_exists(<function> <variable>)

Checks that the <function> is provided by libraries on the system and store the result in a <variable>, which will be created as an internal cache variable.

The following variables may be set before calling this macro to modify the way the check is run:

CMAKE_REQUIRED_FLAGS

string of compile command line flags.

CMAKE_REQUIRED_DEFINITIONS

a ;-list of macros to define (-DFOO=bar).

CMAKE_REQUIRED_INCLUDES

a ;-list of header search paths to pass to the compiler.

CMAKE_REQUIRED_LINK_OPTIONS

a ;-list of options to add to the link command.

CMAKE_REQUIRED_LIBRARIES

a ;-list of libraries to add to the link command. See policy CMP0075.

CMAKE_REQUIRED_QUIET

execute quietly without messages.