cmake COMPILER_RT_HAS_WGNU_ANONYMOUS_STRUCT_FLAG examples

Lewuathe/mlir-hello thirdparty/llvm-project/compiler-rt/cmake/config-ix.cmake :141

check_cxx_compiler_flag("-Werror -Wgnu-anonymous-struct" COMPILER_RT_HAS_WGNU_ANONYMOUS_STRUCT_FLAG)