[Bug 688171] i686-pc-mingw32-pkg-config shouldn't unset PKG_CONFIG_PATH

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https://bugzilla.redhat.com/show_bug.cgi?id=688171

Erik van Pienbroek <erik-fedora at vanpienbroek.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #1 from Erik van Pienbroek <erik-fedora at vanpienbroek.nl> 2011-03-17 07:27:34 EDT ---
Unfortunately this will break compilation of packages using RPM:
$ grep -Hr PKG_CONFIG /usr/lib/rpm/*
macros:  PKG_CONFIG_PATH=\"%{_libdir}/pkgconfig:%{_datadir}/pkgconfig\"\
macros:  export PKG_CONFIG_PATH\
pkgconfigdeps.sh: export PKG_CONFIG_PATH="$DIR:$DIR/../../share/pkgconfig"
pkgconfigdeps.sh: export PKG_CONFIG_PATH="$DIR:$DIR/../../share/pkgconfig"

The match in the macros file is part of the %___build_pre section (which will
always get called in RPM %build sections)

If I change the mingw32-curl package to this:
 %build
+export > /tmp/rpm_export1
 %{_mingw32_configure} \
   --with-ssl --enable-ipv6 \
   --with-ca-bundle=%{_mingw32_sysconfdir}/pki/tls/certs/ca-bundle.crt \
   --with-libidn \
   --enable-static --with-libssh2 \
   --without-random
+export > /tmp/rpm_export2

Then the /tmp/rpm_export1 file will contain the line: export
PKG_CONFIG_PATH="/usr/lib64/pkgconfig:/usr/share/pkgconfig" (set by the
%___build_pre macro)
The /tmp/rpm_export2 file doesn't have the PKG_CONFIG_PATH export as the
%{_mingw32_configure} call (thus %{_mingw32_env}) has replaced it with: export
PKG_CONFIG_LIBDIR="/usr/i686-w64-mingw32/sys-root/mingw/lib/pkgconfig" (which
is what we want to avoid pulling in native stuff)

A possible solution to your issue would be that a new variable like
MINGW32_PKG_CONFIG_PATH gets introduced. When it's set, we won't unset the
PKG_CONFIG_PATH, but set the PKG_CONFIG_PATH to the value of that
MINGW32_PKG_CONFIG_PATH variable. So with this, you could do something like:

MINGW32_PKG_CONFIG_PATH=/opt/my_custom_prefix/lib/pkgconfig pkg-config --cflags
glib-2.0

How do the other Fedora MinGW maintainers think of such a change?

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