Re: Determinism issue

[Ondra Pelech]

oh, great, thanks for the explanation!
regarding the fixed point, from your linked mail, I don't understand
what is already accomplished and what still has to be done to reach
fixed point.
so what is the status quo?
best regards
Ondra


On Sat, Jul 19, 2014 at 3:52 PM, Ludovic Courtès <address@hidden> wrote:
> Hello,
>
> Roughly, there’s not much difference between what Guix and Nixpkgs
> provide in terms of build determinism, but this is clearly something
> we’re interested in.
>
> Guix may be slightly stricter in that chroot builds are the default, and
> it doesn’t rely on /bin/sh being in the chroot (unlike Nixpkgs.)
>
> You mention profile-guided optimizations.  This is *disabled* by default
> in GCC, AFAIK, so GCC is definitely deterministic.
>
> Another thing we do is build Binutils with
> --enable-deterministic-archives, which makes ‘ar’ archives with zeroed
> timestamps by default.
>
> For other examples of non-determinism issues, the Debian project has a
> nice summary: <https://wiki.debian.org/ReproducibleBuilds>.
>
> Similarly, some time ago, I started looking a fixed-point builds, though
> I didn’t complete that:
>
>   https://lists.gnu.org/archive/html/guix-devel/2013-09/msg00159.html
>
> Thanks,
> Ludo’.