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The C standards don't allow an empty translation unit which can be avoided by declaring something, without exporting any symbols. When I committed f644473a211394447824ea00518d0a214ff3f7f2 I had a feeling that some specific toolchain somewhere didn't like empty object files (assembler or maybe "ar" complained) but I cannot find anything to confirm this now. Quite likely I remembered nonsense. I leave this here as a note to my future self. :-)