path: root/Makefile
diff options
authorPaul Kocialkowski <>2015-07-26 18:48:15 +0200
committerTom Rini <>2015-07-27 15:03:14 -0400
commitf3f431a712729a1af94d01bd1bfde17a252ff02c (patch)
tree8ce4a040eac05ef88909a5407cacc8b70add84ae /Makefile
parent9c5748775228f6648a99d1e28acef92012fa031e (diff)
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 <>
Diffstat (limited to 'Makefile')
1 files changed, 4 insertions, 3 deletions
diff --git a/Makefile b/Makefile
index 5e330432a1..394ed096f0 100644
--- a/Makefile
+++ b/Makefile
@@ -1230,9 +1230,10 @@ define filechk_version.h
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"')
+ 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"' )
$(version_h): include/config/uboot.release FORCE
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