Change in coreboot[master]: Makefile: set and export SOURCE_DATE_EPOCH by using genbuild_h.sh -e

[Alexander Couzens (Code Review)]

Attention is currently required from: Martin Roth.
Alexander Couzens has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/51364 )

Change subject: Makefile: set and export SOURCE_DATE_EPOCH by using genbuild_h.sh -e
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Makefile: set and export SOURCE_DATE_EPOCH by using genbuild_h.sh -e

Set SOURCE_DATE_EPOCH [1] to allow payload builds and tools to use this
as arbitrary timestamp to allow reprocucible builds.
In prepration to build Linux reproducible.

[1] https://reproducible-builds.org/docs/source-date-epoch/

Change-Id: I2c870023d13ff4c95305c8aba1459c1fcaf18773
Signed-off-by: Alexander Couzens 
---
M Makefile
1 file changed, 2 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/64/51364/1

diff --git a/Makefile b/Makefile
index 66b4535..7748c01 100644
--- a/Makefile
+++ b/Makefile
@@ -22,8 +22,9 @@
 LANG:=C
 LC_ALL:=C
 TZ:=UTC0
+SOURCE_DATE_EPOCH := $(shell $(top)/util/genbuild_h/genbuild_h.sh -e)
 # don't use COREBOOT_EXPORTS to ensure further tools be reproducible
-export LANG LC_ALL TZ
+export LANG LC_ALL TZ SOURCE_DATE_EPOCH

DOTCONFIG ?= $(top)/.config
 KCONFIG_CONFIG = $(DOTCONFIG)