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

[David Hendricks (Code Review)]

David Hendricks 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: Code-Review+2

(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)
> In GCC 10 LTO linking will automatically detect the number of available cores and do the linking in  […]

Regarding -flto=auto, the man page for gcc 9.2.1 (which I happen to have installed) says: "Use -flto=auto to use GNU make's job server, if available, or otherwise fall back to autodetection of the number of CPU threads present in your system."

I guess we may as well be explicit about what we want, i.e. what CPUS= is set to on the command-line). Whether or not GCC overrides that is another matter.