Recent visibility changes break ability to build GCC on head

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From: Steve Kargl <kargls_at_comcast.net>
Date: Thu, 15 Oct 2026 17:36:41 UTC

The recent commit

   commit d08296c7ab0d7bb259bf7b8cdf9ffb819c1929ab
   Author:     Faraz Vahedi <kfv@FreeBSD.org>
   AuthorDate: Sat Jun 20 01:20:20 2026 +0330
   Commit:     Faraz Vahedi <kfv@FreeBSD.org>
   CommitDate: Thu Aug 13 20:08:49 2026 +0330

     libc: Implement qualifier-preserving standard library functions

breaks the ability to bootstrap gcc on FreeBSD.  Bootstrap
dies due to libiberty not seeing that FreeBSD has memrchr.

It appears that the /usr/ports/lang/gcc16 maintainer is aware of
the issue and works around the problem with a patch to 
gcc/include/libiberty.h.

I've reported the issue the GCC project, and it has been suggested
that autoconf should handle this case.  At moment, I have no clue
how to update gcc so it actually bootstraps.