[coreboot-gerrit] Change in coreboot[master]: libpayload: Add support for link time optimization

[Nico Huber (Code Review)]

Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/38291 )

Change subject: libpayload: Add support for link time optimization
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Patch Set 3:

(1 comment)

https://review.coreboot.org/c/coreboot/+/38291/3/payloads/libpayload/Makefil... 
File payloads/libpayload/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/38291/3/payloads/libpayload/Makefil... 
PS3, Line 69: $(CPUS)
> Regarding -flto=auto, the man page for gcc 9.2. […]

I'm confused. The GCC manual states

If you specify the optional N, the optimization and code generation
    done at link time is executed in parallel using N parallel jobs by
    utilizing an installed 'make' program.

But isn't this `Makefile.inc` only about compile-time? Does it have
an effect here?

Hmmm, I also can't find anything about `auto`. Am I looking at the wrong
option?