From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: bug#38336: =?UTF-8?Q?=E2=80=98wine64-staging=E2=80=99?= is very
 expensive to build
Date: Sat, 23 Nov 2019 00:12:07 +0100
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To: bug-Guix@gnu.org
Cc: Rutger Helling <rhelling@mykolab.com>

Hello,

I noticed that =E2=80=98wine64-staging=E2=80=99 is our most expensive packa=
ge to build.
Initially I was surprised because it only has a couple of nodes more in
its <package> object than =E2=80=98wine-staging=E2=80=99:

--8<---------------cut here---------------start------------->8---
ludo@ribbon ~/src/guix$ guix graph wine-staging |grep 'label =3D ' |wc -l
509
ludo@ribbon ~/src/guix$ guix graph wine64-staging |grep 'label =3D ' |wc -l
511
--8<---------------cut here---------------end--------------->8---

However, that single additional node leads to the duplication of the
whole derivation graph on x86_64-linux:

--8<---------------cut here---------------start------------->8---
ludo@ribbon ~/src/guix$ guix graph -t derivation wine-staging |grep 'label =
=3D ' |wc -l
2738
ludo@ribbon ~/src/guix$ guix graph -t derivation wine64-staging |grep 'labe=
l =3D ' |wc -l
4598
--8<---------------cut here---------------end--------------->8---

This is because =E2=80=98wine-staging=E2=80=99 has a hard-coded =E2=80=98#:=
system "i686-linux"=E2=80=99,
whereas =E2=80=98wine64-staging=E2=80=99 is (unsurprisingly :-)) built on x=
86_64-linux.

(The same problem happens with =E2=80=98wine=E2=80=99 vs. =E2=80=98wine64=
=E2=80=99.)

Likewise, =E2=80=98guix size wine64=E2=80=99 shows that every dependency ap=
pears twice
(one 32-bit, one 64-bit), and thus the total size is twice that of
=E2=80=98wine=E2=80=99.

Rutger, is there something that can be done to avoid this?  Apparently
only JSON files are copied from =E2=80=98wine-staging=E2=80=99 into =E2=80=
=98wine64-staging=E2=80=99,
but maybe they refer to 32-bit shared libraries or something?

Thanks,
Ludo=E2=80=99.