[Bug 261977] lang/gcc12-devel: enable LTO

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 20 Apr 2022 02:12:59 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261977

--- Comment #41 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #40)

Adding somewhat good data for FreeBSD servers targeting armv7:

Feb, pre-LTO style:

http://beefy12.nyi.freebsd.org/build.html?mastername=130releng-armv7-quarterly&build=35b5f38563a2

gcc11-devel-11.2.1.s20211009 success       76:54:27
gcc12-devel-12.0.0.s20211205 build/timeout 96:01:10


So if LTO-style takes 3 or more times longer to build, and using
the shorter time (so:a lower bound estimate), that is over 200
hours, well over a week.

The larger time (gcc12-devel's) and, say, 4 times longer is
more like 400 hours, so over 2 weeks.

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