A few warning options lack the 'Warning' flag, which since r228094 (2015-09-24) has the effect that -W(no-)error= doesn't work for them. Additionally, --help=warnings doesn't work for them either.
Successfully bootstrapped with c,c++,fortran,lto,go,objc,obj-c++,java on x86-64-gnu-linux & checked whether the issue in the PR was fixed. I intent to commit the patch tomorrow as obvious unless someone has objections. Tobias
