From f3f431a712729a1af94d01bd1bfde17a252ff02c Mon Sep 17 00:00:00 2001 From: Paul Kocialkowski Date: Sun, 26 Jul 2015 18:48:15 +0200 Subject: Reproducible U-Boot build support, using SOURCE_DATE_EPOCH In order to achieve reproducible builds in U-Boot, timestamps that are defined at build-time have to be somewhat eliminated. The SOURCE_DATE_EPOCH environment variable allows setting a fixed value for those timestamps. Simply by setting SOURCE_DATE_EPOCH to a fixed value, a number of targets can be built reproducibly. This is the case for e.g. sunxi devices. However, some other devices might need some more tweaks, especially regarding the image generation tools. Signed-off-by: Paul Kocialkowski --- Makefile | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index 5e330432a1..394ed096f0 100644 --- a/Makefile +++ b/Makefile @@ -1230,9 +1230,10 @@ define filechk_version.h endef define filechk_timestamp.h - (LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"'; \ - LC_ALL=C date +'#define U_BOOT_TIME "%T"'; \ - LC_ALL=C date +'#define U_BOOT_TZ "%z"') + (SOURCE_DATE="$${SOURCE_DATE_EPOCH:+@$$SOURCE_DATE_EPOCH}"; \ + LC_ALL=C date -u -d "$${SOURCE_DATE:-now}" +'#define U_BOOT_DATE "%b %d %C%y"'; \ + LC_ALL=C date -u -d "$${SOURCE_DATE:-now}" +'#define U_BOOT_TIME "%T"'; \ + LC_ALL=C date -u -d "$${SOURCE_DATE:-now}" +'#define U_BOOT_TZ "%z"' ) endef $(version_h): include/config/uboot.release FORCE -- cgit v1.2.1