project(check_function_exists)
cmake_minimum_required(VERSION 2.8)
include(CheckFunctionExists)

CHECK_FUNCTION_EXISTS(printf HAVE_PRINTF)
CHECK_FUNCTION_EXISTS(non_existing_printf HAVE_NON_EXISTING_PRINTF)
CHECK_FUNCTION_EXISTS(fprintf HAVE_FPRINTF)

IF(HAVE_NON_EXISTING_PRINTF)
    MESSAGE(FATAL_ERROR "Found non_existing_printf")
ENDIF()