Hello Paul,
Am 12.06.2015 22:21, schrieb Paul Kocialkowski:
Le vendredi 12 juin 2015 à 17:31 +0200, Heiko Schocher a écrit :
With this option enabled each compilation creates the exact same binary. There are no timestamps, with which a U-Boot binary can be identified.
This option is disabled by default.
I think a bit more is needed to get truly reproducible builds in U-Boot, but this is a first good step!
I have been thinking about bringing reproducible builds to U-Boot for a little while, but never got around actually doing it. Are you interested in helping me on that? I have some free time these days, so I could do some work on this.
Hmm.. define what is a "reproducible build" ... my patch produces always the same u-boot binary if you not change the toolchain ...
It would certainly be relevant to get in touch with the people working on reproducing builds for Debian (I know Lunar is involved with this), since Debian packages U-Boot for many devices and they're apparently willing to help upstream with automated tests, as they're doing with coreboot and OpenWRT!
Yep, that would be helpful ...
bye, Heiko
Signed-off-by: Heiko Schocher hs@denx.de
Kconfig | 9 +++++++++ Makefile | 8 ++++++++ 2 files changed, 17 insertions(+)
diff --git a/Kconfig b/Kconfig index 15e15af..c0c7eb8 100644 --- a/Kconfig +++ b/Kconfig @@ -81,6 +81,15 @@ menuconfig EXPERT Only use this if you really know what you are doing.
if EXPERT
- config SYS_EXACT_BINARY
- bool "Create time and date independent binary"
- default n
- help
With this option enabled each compilation creates the exactsame binary. There are no timestamps, with which a U-Bootbinary can be identified.This option is disabled by default.- config SYS_MALLOC_CLEAR_ON_INIT bool "Init with zeros the memory reserved for malloc (slow)" default y
diff --git a/Makefile b/Makefile index 0a674bf..4ae2701 100644 --- a/Makefile +++ b/Makefile @@ -1230,11 +1230,19 @@ define filechk_version.h echo #define LD_VERSION_STRING "$$($(LD) --version | head -n 1)"; ) endef
+ifeq ($(CONFIG_SYS_EXACT_BINARY),y) +define filechk_timestamp.h
- (LC_ALL=C date +'#define U_BOOT_DATE "NODATE"'; \
- LC_ALL=C date +'#define U_BOOT_TIME "NOTIME"'; \
- LC_ALL=C date +'#define U_BOOT_TZ "NOTZ"')
+endef +else 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"') endef +endif
$(version_h): include/config/uboot.release FORCE $(call filechk,version.h)