[coreboot-gerrit] Change in coreboot[master]: Kconfig,Makefile.inc: Add support for link time optimization

[Michael Niewöhner (Code Review)]

Michael Niewöhner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/38989 )

Change subject: Kconfig,Makefile.inc: Add support for link time optimization
......................................................................

Patch Set 11:
> Patch Set 11:
> > Patch Set 11: Code-Review+1
> >
> > tested successfully for system76/lemp9. builds fine, boots fine
>
> That's good to hear, I'm glad there isn't any breakage. Did the binary size decrease at all?

LTO disabled:
fallback/romstage              0x80       stage           47188 none
fallback/ramstage              0x3b1c0    stage          106256 none
fallback/postcar               0x116680   stage           20252 none
fallback/payload               0x11b600   simple elf     461468 none
bootblock                      0xba3dc0   bootblock       49152 none

LTO enabled:
fallback/romstage              0x80       stage           42876 none   - 9.13 %
fallback/ramstage              0x3a100    stage           94121 none   -11.42 %
fallback/postcar               0x112680   stage           18348 none   - 9.40 %
fallback/payload               0x116e80   simple elf     461651 none   + 0.04 %
bootblock                      0xba3dc0   bootblock       49152 none     0.00 %