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

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

--- Comment #18 from Piotr Kubaj <pkubaj@FreeBSD.org> ---
(In reply to Robert Clausecker from comment #17)
Are build times that relevant? Sure, if you insist on building manually on a
slow hardware, it's going to be painful, but we have binary packages for such
users.

IMO faster and smaller packages for everyone is worth it and we have package
cluster exactly to allow users to easily install ready-to-use packages.

If for some reason builds time out on the cluster (don't know, didn't check),
then you should open a new PR to ask portmgr@ to increase timeouts (or maybe
use more threads to build gcc). Since I'm not in portmgr@, I can't do that.

Although I was not around at that time, I believe when -O2 was added to default
flags, many people also complained about that, due to more resources being
used, but after all, it was worth the cost. Or do you also add -O0 to your
builds to make them faster?

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