Change in coreboot[master]: Makefile: set and export SOURCE_DATE_EPOCH

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/51364 )

Change subject: Makefile: set and export SOURCE_DATE_EPOCH
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Makefile: set and export SOURCE_DATE_EPOCH

Set SOURCE_DATE_EPOCH [1] to allow payload builds and tools to use this
as arbitrary timestamp to allow reprocucible builds.

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

Change-Id: I2c870023d13ff4c95305c8aba1459c1fcaf18773
Signed-off-by: Alexander Couzens 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51364
Tested-by: build bot (Jenkins) 
Reviewed-by: Patrick Georgi 
---
M Makefile
1 file changed, 2 insertions(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Patrick Georgi: Looks good to me, approved

diff --git a/Makefile b/Makefile
index e307e1d..1388977 100644
--- a/Makefile
+++ b/Makefile
@@ -24,9 +24,10 @@
 LANG:=C
 LC_ALL:=C
 TZ:=UTC0
+SOURCE_DATE_EPOCH := $(shell $(top)/util/genbuild_h/genbuild_h.sh . | sed -n 's/^.define COREBOOT_BUILD_EPOCH>.*"(.*)".*/\1/p')
 # don't use COREBOOT_EXPORTS to ensure build steps outside the coreboot build system
 # are reproducible
-export LANG LC_ALL TZ
+export LANG LC_ALL TZ SOURCE_DATE_EPOCH

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