cmake_minimum_required(VERSION 3.15) project(objctest LANGUAGES C OBJC) include(CheckOBJCCompilerFlag) check_objc_compiler_flag(-fobjc-arc HAVE_OBJC_ARC) if(HAVE_OBJC_ARC) add_compile_options(-fobjc-arc) add_compile_definitions(HAVE_OBJC_ARC) endif() add_library(myfuncs STATIC myfuncs.m)