From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan Nieuwenhuizen <janneke@gnu.org>
Subject: Re: [bootstrappable] diverse double compilation: using $ORIGIN?
Date: Sun, 05 Nov 2017 17:27:24 +0100
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In-Reply-To: <878tfkr9lj.fsf@gnu.org> ("Ludovic
	\=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: guix-devel@gnu.org, bootstrappable@freelists.org

Ludovic Court=C3=A8s writes:

>> Usage: guix build gcc-dcc
>>
>> Building gcc-dcc tests the diverse double compilation property
>> of the gcc that Guix is using.
>>
>> * gnu/packages/bootstrappable.scm: New file.
>> * gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
>
> Awesome!  Does it build fine out-of-the-box?  I didn=E2=80=99t expect it =
to be
> =E2=80=9Cthis easy.=E2=80=9D  :-)

I got very positive feedback from a slightly guix-sceptic person saying
something like: you lisp guys can do quite a lot with very little code.

However, all this patch adds is a test that fails: gcc built with gcc is
not bit-for-bit the same as gcc built with clang.

Since then I have included the build-path-prefix-map patch, use -rpath
$ORIGIN instead of -rpath "-lib", switched to gcc-7.2.0.  Still, no
bit-reproducibility.

Of course, Guix has the additional problem of the install-prefix that
debian and others do not have.

I'll be sending updated patches soon.

janneke.

--=20
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar=C2=AE http://AvatarAcademy.com