On Wed, 27 Jun 2018 at 17:28, Eric Gallager wrote: > At first I was going to wonder if it wasn't necessary to remain > compatible with old versions of GCC that don't support -Wabi=11, but > then I reread the part about this happening with the just-built GCC, > so if that warning is only ever used with the just-built GCC, then > yeah, I'd guess it'd probably be okay.
Libstdc++ is only ever built with the new GCC. Building it out-of-tree isn't supported.