[Bug 292067] [exp-run] Against llvm-21-update branch on GitHub

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292067

--- Comment #4 from Dimitry Andric <dim@FreeBSD.org> ---
One important note is that libc++ 21 doesn't compile with gcc 14 and lower at
the moment, even though the internal compiler version check says that it
_should_ compile with gcc 14 and higher.

I have raised an upstream ticket at
https://github.com/llvm/llvm-project/issues/174203, but my experience with the
libc++ folks is that they are rather eager to drop "old" compiler support.

Meanwhile, I am looking for some ways to bring back support for at least gcc
14. In the past I have hacked up some of the libc++ headers to also support gcc
13 and 12, but with libc++ 21 I think that is now a lost race.

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