[U-Boot] [Reproducible-builds] [U-Boot, v2] Reproducible U-Boot build support, using SOURCE_DATE_EPOCH

[Vagrant Cascadian]

On 2015-08-25, Andreas Bießmann wrote:
> On 07/28/2015 05:00 PM, Tom Rini wrote:
>> On Sun, Jul 26, 2015 at 06:48:15PM +0200, 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.
>>>
>>> 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 <contact at paulk.fr>
>> 
>> Applied to u-boot/master, thanks!
>
> This commit breaks build on non GNU hosts (like OS X and persumably
> other *BSD hosts). Before, those hosts where supported, so for me this
> has to be fixed for 2015.10
>
> We need a) some mechanism to search for the GNU date variant or b) some
> wrapper to provide the correct output on those host machines.
>
> I vote for a), it is acceptable to have the GNU date available but we
> should error on 'no GNU date available'. Furthermore we need to have the
> date command exchangeable by e.g. gdate, gnudate, ... maybe with full path.

There was a proposed patch which only uses the GNU date extensions if
SOURCE_DATE_EPOCH environment variable is set, would this sufficiently
address your concerns, at least for the short term?

  Message-Id: <1438337042-30762-1-git-send-email-judge.packham at gmail.com>
  http://lists.denx.de/pipermail/u-boot/2015-August/221429.html


live well,
  vagrant
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