From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#30249: configure: =?UTF-8?Q?=E2=80=9Cguile2=E2=80=9D?= is checked
	before =?UTF-8?Q?=E2=80=9Cguile=E2=80=9D?=
Date: Thu, 25 Jan 2018 17:57:03 +0100
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To: Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de>
Cc: 30249@debbugs.gnu.org

Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de> skribis:

> On Fedora there is /usr/bin/guile2.  When I want to configure Guix from
> source I run =E2=80=9Cguix environment guix=E2=80=9D and run =E2=80=9C./c=
onfigure=E2=80=9D.  This aborts
> because the configure script finds the system=E2=80=99s /usr/bin/guile2 b=
efore
> =E2=80=9Cguile=E2=80=9D from the environment.
>
> Here=E2=80=99s the error:
>
> configure: checking for guile 2.2
> configure: found guile 2.2
> checking for guile-2.2... no
> checking for guile2.2... no
> checking for guile-2... no
> checking for guile2... /usr/bin/guile2
> configure: error: found development files for Guile 2.2, but /usr/bin/gui=
le2 has effective version 2.0
> make: *** [Makefile:3071: config.status] Error 1

The code for this check is in the =E2=80=98GUILE_PROGS=E2=80=99 macro, defi=
ned in
meta/guile.m4 in Guile.

I think it makes sense for this macro to try version-specific program
names first, and only then to fall back to =E2=80=9Cguile=E2=80=9D.  So I w=
ould suggest
leaving this macro unchanged.

That said, guile-2.2.pc and guile-2.0.pc both define =E2=80=98guile=E2=80=
=99 and
=E2=80=98guild=E2=80=99.  So =E2=80=98GUILE_PROGS=E2=80=99 should probably =
use these when pkg-config is
being used, instead of trying to guess from $PATH.

Thoughts?

> To make this work I need to move /usr/bin/guile2 away or make it
> otherwise unaccessible (e.g. with =E2=80=9Cguix environment --container g=
uix=E2=80=9D).
>
> Is there something we can do about this to ensure that =E2=80=9Cguix envi=
ronment
> guix=E2=80=9D is sufficient to build Guix from source on Fedora?

We could encourage people to use --pure or -C.

Ludo=E2=80=99.