Re: [gentoo-dev] crossdev and multilib interference

[Alexandre Rostovtsev]

On Thu, 2014-03-13 at 09:55 +0100, Michał Górny wrote:
> Dnia 2014-03-12, o godz. 15:46:01
> hasufell <hasufell@g.o> napisał(a):
>
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> >
> > We have a problem where the crossdev pkg-config wrapper scripts
> > interfere with multilib.
> >
> > crossdev for example sets in their pkg-config wrappers:
> >
> > PKG_CONFIG_LIBDIR="${SYSROOT}/usr/lib/pkgconfig:${SYSROOT}/usr/share/pkgconfig"
> >
> > Now, SYSROOT is chosen from multiple conditions. When emerging a
> > package, that happens to be "/" and thus results in:
> >   "//usr/lib/pkgconfig://usr/share/pkgconfig"
> >
> > Build systems like autotools will pick the crossdev provided
> > "i686-pc-linux-gnu-pkg-config" for the 32bit ABI which will in turn
> > override the eclass-exported PKG_CONFIG_LIBDIR and now effectively
> > find the pkg-config files in /usr/lib64/...
> >
> > This is not a problem most of the time if the package just wants to
> > get the libs to link against.
> >
> > However, every package that tries to access variables that are
> > different between /usr/lib32/pkgconfig/foo.pc and
> > /usr/lib64/pkgconfig/foo.pc like "libdir" will fail or produce
> > unexpected results.
> >
> > That already happens for
> > x11-libs/libva-vdpau-driver
> > x11-libs/libva (https://bugs.gentoo.org/show_bug.cgi?id=500338)
> >
> > and there are probably more.
>
> Another possible workaround is to make pkgconfig true-multilib. Then it
> would own i686-pc-linux-gnu-pkgconfig, and that executable would work
> correctly. More than that, we could work on killing the PKG_CONFIG_PATH
> hack.

That won't work with current versions of crossdev because they blindly
create/delete their pkg-config wrappers without checking if they are
overwriting or removing something that belongs to another package.