Re: [coreboot] Passing CFLAGS to coreboot make (and reproducible builds)

[Trammell Hudson]

On Thu, Feb 02, 2017 at 09:10:09PM +0100, Patrick Georgi via coreboot wrote:
> coreboot is normally reproducible:
> https://tests.reproducible-builds.org/coreboot/coreboot.html

Hmm.  I must have messed up someting in my earlier tests (maybe they
ran without BUILD_TIMELESS=1?).  You're right; the resulting firmware
images do not depend on the build path, so the extra CFLAGS are not
necessary.

Passing CFLAGS to coreboot make (and reproducible builds)

[Julius Werner]

> Hmm.  I must have messed up someting in my earlier tests (maybe they
> ran without BUILD_TIMELESS=1?).  You're right; the resulting firmware
> images do not depend on the build path, so the extra CFLAGS are not
> necessary.

CBFS binaries (SELFs) cannot contain debug symbols, so -fdebug-prefix-map
can't really affect them. If you want intermediate build artifacts (e.g.
bootblock.elf and friends) to be reproducible, you'd have to add some flags
like you suggested. If you're fine with just the final images it should
already work out of the box.