cmake COMPILER_RT_HAS_EMPTY_BODY_FLAG examples

Lewuathe/mlir-hello thirdparty/llvm-project/compiler-rt/cmake/config-ix.cmake :168

check_cxx_compiler_flag("-Werror -Wempty-body" COMPILER_RT_HAS_EMPTY_BODY_FLAG)

CTSRD-CHERI/cheribsd contrib/subrepo-cheri-compiler-rt/cmake/config-ix.cmake :145

check_cxx_compiler_flag(-Werror -Wempty-body COMPILER_RT_HAS_EMPTY_BODY_FLAG)