https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111406
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- These are only used in the install targets which when bootstrapped will have used GCC from earlier stages. When building cross compilers we require GCC as host compiler. So I think this isn't an issue unless you try to build libiberty stand-alone or as part of binutils and also install it? The sourceware bugzilla instance also doesn't have a libiberty component, so tracking it here is possibly good enough but as said above you'll not hit it in practice?
