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

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261977

--- Comment #40 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Piotr Kubaj from comment #35)

Note: I agree that most FreeBSD build server activity
for building lang/gcc*'s (gcc11+) can reasonably use
LTO style. But there is a reason for the "most" . . .

To my knowledge, no FreeBSD build server targeting
armv6 or armv7 has ever had such a LTO build of a gcc*
complete, one reason being because after the first
stage bootstrap, it is nearly all via QEMU, possibly
leading to 100+ hours being needed for a build (!no
good data!). In other words, these two target
architectures did not meet the Comment #4 criteria:

QUOTE
Let's see whether it builds now fine for all the packaged architectures and
versions.
END QUOTE

Avoiding the LTO style builds targeting armv6 or armv7
may well be reasonable for the FreeBSD build servers and
for other contexts targeting armv6 or armv7.

To my knowledge, the rest of architectures that the FreeBSD
servers target avoid needing to use QEMU (or analogous) and
so avoid the related issues.

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