[gentoo-dev] crossdev and multilib interference

[hasufell <hasufell@gentoo.org>]

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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.

A simple workaround is:
PKG_CONFIG="pkg-config" emerge foo

But I think that is not appropriate to set in the eclass. How can we
solve this? Don't bikeshed.
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