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

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

--- Comment #12 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Matthias Andree from comment #11)

Careful with size calculations: my figures were for a 16 core system
using all the cores. I've not investigated if, say, a 4 core system
using all its cores would use more like 1/4 the memory or not. It
would not get as many ld's going at once and I do not know the
relative sizes of the various ld's that might overlap in time for
whatever the configuration is.

The same sort of point goes for the memory use for bootstrap-debug
style builds: it was the same 16 core type of context.

General expectations of relatively bigger vs. smaller memory use
between the two bootstrap-* styles is likely very reasonable. But
I do not know about detailed sizing relationships across a variety
of contexts.

I only got into testing this as a way to provide some background
information for:

https://lists.freebsd.org/archives/freebsd-toolchain/2022-March/000450.html

where Dimitry Andric did not have direct access to information
he wanted about a recent build failure on a FreeBSD aarch64 server.

I do not really plan on doing more in this bugzilla submittal's
comments. I've provided my evidence about tradeoffs and presented
my points. I'm unclear which mechanism would be appropriate to
express picking the bootstrap-* style to use.

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