Makefile,genbuild: Provide length for abbreviated commit hashes

The original default, minimum abbreviated hash length was 7. It dif-
fers on newer systems, however. This breaks reproducibility, so set
an explicit length. 12 hex digits should be good enough.

Note: This sets only a minimum. With a high enough number of commit
objects in the repository, Git could still decide to use a longer
hash, again breaking reproducibility. 12 digits will hopefully pro-
vide enough margin.

Change-Id: Ia86e9cc41e27a0a57d498dcb13aec954c4ea0f04
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76560
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

0 files changed, 0 insertions, 0 deletions