bug#26316: Enable threaded compression of source tarballs

[Leo Famulari <leo@famulari.name>]

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On Fri, Mar 31, 2017 at 02:15:36PM -0400, Kei Kebreau wrote:
> Leo Famulari <leo@famulari.name> writes:
> > Subject: [PATCH] packages: Enable threaded compression of source tarballs.

> > -                                      "cvfa" #$output
> > +                                      "cvf" #$output
> > +                                      ;; The bootstrap xz does not support
> > +                                      ;; threaded compression (introduced in
> > +                                      ;; 5.2.0), but it ignores the extra flag.
> > +                                      (string-append "--use-compress-program="
> > +                                                     #+xz "/bin/xz --threads=0")

One question I have is about the removal of 'cvfa'. Here is the relevant
documentation:

-a, --auto-compress
             Use archive suffix to determine the compression
	     program.

AFAICT, we only build XZ archives, so it's okay to remove 'a' and
hard-code the use of xz. Is that correct?

> >                                        ;; avoid non-determinism in the archive
> >                                        "--mtime=@0"
> >                                        "--owner=root:0"
> 
> LGTM.

Thanks! This does mean rebuilding the world, so we'd need to save it for
the next core-updates cycle.

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