[Bug 255374] C++20 features (headers) std::concepts, std::format, std::numbers, std::source_location, etc. are missing

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255374

--- Comment #19 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #18)

Hmm. Parallelism is apparently C++17&20, not just
C++20, yet has the llvm status of in-progress or
not-started depending on the specific sub-areas
referenced: no sub-area indicated as completed.

The steps of progress are not in units of overall
language/library official-definition versions.
Library coverage for C++17 is still somewhat
incomplete, despite various parts of the library
coverage of C++20 and later being in place in the
likes of llvm 16 (say).

As for FreeBSD, there is also the timing of when
FreeBSD adopts some libc++ material once it is
available in a llvm that FreeBSD has partially
adopted. This can be later than the language
update. (I'm not just referencing holding llvm at
the version intended for an upcoming stable branch
creation/update until after the change to stable
has happened.)

So, if there was an overall C++17 libc++ bugzilla
submittal analogous to this one, it too would still
be "In Progress" in 2023-Apr.

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