https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233769

--- Comment #11 from Bryan Drewery <bdrew...@freebsd.org> ---
Just passing through -S in tools/install.sh is not enough.
1. Maybe this tool is expected to work on Linux where -S does something
different.
2. The symlink/hardlink support call ln(1) which are is atomic for symlinks. It
does unlink(2) followed by symlink(2).

Reworking the build to avoid double installs here is possible but would be more
hackish IMO. We would need to muck with the SUBDIR lists for gnu/lib to fix
this specific case so that it only installs during the right phase of
buildworld (like we do for llvm kinda). But that's JUST gnu/lib. The same
problem could come up for other libraries eventually given enough
install-to-worldtmp threads.

META_MODE+filemon may eventually learn how to avoid the double installs but it
has not yet. DIRDEPS_BUILD learned how. It's not hard to implement just risky
and needs time devoted to testing. Of course this then requires filemon which
isn't the solution some people want to hear.

The double install/relink issue isn't causing a problem beyond this race which
is why I think we just need to make the install atomic rather than wack-a-mole
with SUBDIR hacks.

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