cmake_minimum_required(VERSION 3.16)
project(CheckOBJCCompilerFlag OBJC)
include(CheckOBJCCompilerFlag)
check_objc_compiler_flag(-DFOO HAS_COMPILER_FLAG)
if(NOT HAS_COMPILER_FLAG)
  message(SEND_ERROR "Test fail: HAS_COMPILER_FLAG: ${COMPILER_FLAG}")
endif()