[U-Boot] Reproducible U-Boot build support, using SOURCE_DATE_EPOCH

[Siarhei Siamashka <siarhei.siamashka@gmail.com>]

On Thu, 24 Sep 2015 09:05:10 -0700
Vagrant Cascadian <vagrant@debian.org> wrote:

> On 2015-07-26, Paul Kocialkowski wrote:
> > 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.
> ...
> > However, some other devices might need some more tweaks, especially regarding
> > the image generation tools.
> 
> With this patch, there is still variation based on timezone in any of
> the u-boot.img and u-boot-sunxi-with-spl.bin produced in the Debian
> packages:
> 
>   https://reproducible.debian.net/rb-pkg/unstable/armhf/u-boot.html
> 
> The good news is that all the u-boot.bin targets are produced
> reproducibly, so here's to progress!

Hello,

I see that Debian is building U-Boot 2015.07 according to the
information from that link. It may be a good idea to ensure that
the following simple patch is also applied:
    http://git.denx.de/?p=u-boot.git;a=commitdiff;h=bfb05d0187d70274c77d02dc0de5e728e1f8be05

It had been submitted at the day when somebody (probably you) was
troubleshooting reproducible build issues and asking questions in
the U-Boot IRC channel.

-- 
Best regards,
Siarhei Siamashka