Re: [Caml-list] Compiling the ocaml distribution under multiarched Debian/Ubuntu

[Philippe Veber <philippe.veber@gmail.com>]

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2012/1/13 Gerd Stolpmann <info@gerd-stolpmann.de>

> Am Freitag, den 13.01.2012, 14:18 +0100 schrieb Stéphane Glondu:
> > Le 13/01/2012 12:59, Philippe Veber a écrit :
> > > Debian and Ubuntu have not so recently switched to multiarch binaries
> > > (including libs, see http://wiki.debian.org/Multiarch/Implementation).
> > > This is an important change for ocaml C bindings since the libraries
> are
> > > now to be found in /usr/lib/<arch description> instead of /usr/lib. I
> > > was just bitten by this, when realizing that the ocaml configure script
> > > couldn't find libX11.so and wouldn't install graphics. A similar
> problem
> > > was handled by the people in charge of debian ocaml packages
> > > (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=619344). Now my
> > > question is the following: will this evolution be a problem for
> GODI/odb
> > > packages (and more generally source distribution), and what is the
> > > advised fix for it?
> >
> > My advice would be to rely on pkg-config (a kind of ocamlfind for C
> > libraries), or similar scripts (pcre-config, etc.) provided by the
> > libraries. Otherwise, there is no good, portable (I mean, not
> > Debian-specific) way to guess where a library is, and the packager will
> > give an explicit path in his call to the configure script in
> > debian/rules. By the way, this is what we did for ocaml [1].
> >
> > [1]
> >
> http://anonscm.debian.org/gitweb/?p=pkg-ocaml-maint/packages/ocaml.git;a=commitdiff;h=1db9b654b7d8b702cddb44df5aea1982f3120883
>
> In GODI there is a library searcher for libs that do not support
> pkg-config et al. It just tries a list of typical paths used by various
> OS. The method works well if the library is not dependent on other
> libraries, and is quite portable. Of course, you cannot be sure to find
> the right library if several versions are installed (which is quite
> common on non-open-source OS where the developer has to do it on its
> own), but otherwise it is good enough for setting a default if the user
> does not have special wishes.
>
> So, e.g. for X11, there is no pkg-config, and GODI falls back to
> searching. Btw, we don't rely here on what the Ocaml configure script
> finds out, but have our own searcher, simply because this makes it
> easier to respect users' wishes.
>
'seems like pkg-config was updated:

pveber@gesundheit:~/usr/src/ocaml-3.12.1$ pkg-config --libs x11
-lX11

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