message: disable builtin functions
diff: @@ -17,7 +17,7 @@ target_include_directories(arch_x86_loader
  target_compile_options(arch_x86_loader
  PRIVATE -O2 -Wall -m64 -std=gnu99 -ffreestanding -mno-red-zone
  - -fomit-frame-pointer)
  + -fomit-frame-pointer -fno-builtin -fnostdlib -nostdinc)
  include(CheckCCompilerFlag)
  check_c_compiler_flag(-fstrength-reduce HAS_STRENGTH_REDUCE)
  