jrtc27 added a comment. Answering the last part myself: GCC only has MULTIARCH_DIRNAME definitions for various linux-gnu*, linux-musl, linux-uclibc, kfreebsd-gnu and -gnu (as an OS, for GNU/Hurd) targets, everything else prints a blank string here. So either we need to decide what the right behaviour is for other OSes, or we should similarly leave it as undefined for non-GNUish (including musl and uclibc) targets?
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