bug#41669: Cross-compiled powerpc64-linux bootstrap-tarballs not reproducible

[Efraim Flashner <efraim@flashner.co.il>]

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On Sun, Dec 27, 2020 at 08:23:21PM -0800, Chris Marusich wrote:
> Leo Le Bouter <lle-bout@zaclys.net> writes:
> 
> > I want to have one last attempt at making the binaries reproducible.
> >
> > Could anyone help adjusting this patch so the package definition's hash
> > does not change on other architectures? So it can be proposed for merge
> > in master..
> >
> > Thank you
> >
> > From e6931a7ebb9cc0681a3211ac38a1c58c7a176481 Mon Sep 17 00:00:00 2001
> > From: John Doe <dftxbs3e@free.fr>
> > Date: Mon, 28 Dec 2020 03:21:08 +0100
> > Subject: [PATCH] gnu: gcc-4.7: Disable parallel compilation on powerpc64*.
> >
> > * gnu/packages/gcc.scm (gcc-4.7)[arguments]: Conditionally disable
> >   parallel compilation on powerpc64*.
> > ---
> >  gnu/packages/gcc.scm | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/gnu/packages/gcc.scm b/gnu/packages/gcc.scm
> > index 4d5aaa7070..6d32677144 100644
> > --- a/gnu/packages/gcc.scm
> > +++ b/gnu/packages/gcc.scm
> > @@ -204,6 +204,8 @@ where the OS part is overloaded to denote a specific ABI---into GCC
> >                                      ,(if stripped? "-g0" "-g")))))
> >  
> >            #:tests? #f
> > +          #:parallel-build? ,(string-prefix? "powerpc64" (or (%current-target-system)
> > +                                                              (%current-system)))
> >  
> >            #:phases
> >            (modify-phases %standard-phases
> 
> If it's just for the sake of trying one last time, we could just add
> --cores=1 to the Guix invocations, or run everything in a single-core
> VM.  Wouldn't that have the same effect?

Close enough. We can also add it into the commit message, to build it
with --cores=1

> I think you'll probably agree, so I've proactively started another build
> on two fresh single-core VMs (using the same procedure I described
> earlier, starting from the 1.2.0 installation ISO image).  It'll take a
> few days to finish, I'm sure.  Please let me know if you think we need
> the patch to run this final experiment.  Otherwise, I'll just report the
> results of this latest experiment in a few days' time.
> 
> -- 
> Chris



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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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