From cbe2ed48e2d25878bcbd11d37af19fd7a0e6b982 Mon Sep 17 00:00:00 2001
From: Alexander Couzens <lynxis@fe80.eu>
Date: Tue, 9 Mar 2021 03:31:07 +0100
Subject: 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 <lynxis@fe80.eu>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51364
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
---
 Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index e307e1da75..1388977704 100644
--- a/Makefile
+++ b/Makefile
@@ -24,9 +24,10 @@ COREBOOT_EXPORTS += top src srck obj objutil objk
 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)
-- 
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