https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103499
--- Comment #6 from Mark Millard <markmigm at gmail dot com> --- (In reply to Jonathan Wakely from comment #5) The relationship I was thinking of was that, without this being fixed, the full set of header units for the standard library probably could not be completed: a blocking issue relative to completing "header-units of STL header files". (Likely necessary but not sufficient for such completion.) I was not trying to say that the issue was limited to just "header-units of STL header files". As long as the problem is fixed, the relationship would be handled, just more implicitly relative to the completion of the "header-units of STL header files". It is good to have examples that do not involve materials from /usr/include/c++/ , for sure.