bug#28016: [PATCH] Reproducible issue for libjpeg-turbo

[Ludovic Courtès]

Hi,

"Z. Ren" <address@hidden> skribis:

> There was a typo (redundant brackets around SOURCE_DATE_EPOCH) in the 
> previous submitted patch, sorry that I'm not very familiar with the Guix 
> system. I attach the modified patch. Following the suggestion of Leo 
> (https://lists.gnu.org/archive/html/help-guix/2017-08/msg00053.html Thanks 
> for the suggestion), I investigate the source code of libjpeg-turbo. It 
> appears that the upstream package supports the argument --with-build-date. 
> Maybe this is more suitable for fixing the unreproducible problem?
>
> Based on this idea, I tried setting configure-flags with SOURCE_DATE_EPOCH. 
> Unfortunately, the flag is not assigned properly with the following snippet:
>
>          #:configure-flags
>          (list (string-append "--with-build-date="
>           (date->string
>            (time-utc->date
>             (make-time time-utc 0
>              (string->number (getenv "SOURCE_DATE_EPOCH")))) "'~Y~m~d'")))
>
> Is it because the environmental variable SOURCE_DATE_EPOCH is not yet
> set at the time of #:configure-flags?

Yes, that’s correct.

I’ve pushed a simple version that does:

  #:configure-flags (list "--with-build-date=1970-01-01")

It’s good enough because we set SOURCE_DATE_EPOCH to 0 anyway.

Thank you for working on reproducibility issues!

Ludo’.