On Fri, Mar 27, 2020 at 4:49 PM James Le Cuirot <ch...@gentoo.org> wrote:
> On Fri, 27 Mar 2020 13:10:34 -0400
> David Michael <fedora....@gmail.com> wrote:
> > I'd like to be able to install qt5 packages in a sysroot for staging,
> > and this is an initial patch for it.  The pkg-config variables might not
> > be required, but it seemed appropriate to pass the sysroot-configured
> > versions through the build.  There are a few caveats:
> >
> >   - The upstream configure scripts do some bad things like this:
> >     https://code.qt.io/cgit/qt/qtbase.git/tree/configure.pri#n363
> >     That makes the build fail for systems using lib64 (e.g. amd64).  I'm
> >     able to work around this by defining PKG_CONFIG_LIBDIR for dev-qt/*.
> Indeed, that sucks. We should probably patch that out. I don't know
> what it means where it says "or use -pkg-config to override this test",
> do you?

I'm not sure, since -pkg-config is already being used by the eclass.
Maybe it was supposed to reference the -force-pkg-config option, which
I haven't tried.

> I suspect you could define PKG_CONFIG_LIBDIR=/ or anywhere that
> simply exists and it will still work because our wrapper redefines that
> variable anyway.
> >   - This isn't for real cross-compiling.  There are places where it
> >     tries to execute cross-compiled programs that I haven't investigated
> >     yet, so this is only for building a sysroot for an architecture
> >     compatible with the build system for now.
> Understood. I did try to do cross-compiling with Qt4 once upon a time
> and I did make a little headway but it wasn't fun.
> >   - The qt packages depend on each other being installed in / as well as
> >     the sysroot, so their ebuilds will need BDEPENDs added.
> I imagine you'd at least need qtcore for qmake and moc. Probably not
> the rest though?

I needed qtcore, qtgui, and qtwidgets in /, but it's possible there
are just bad configure scripts that I didn't dig into yet.  As for VLC
  - qtcore works as is
  - qtgui requires qtcore for bootstrap-private in /
  - qtwidgets requires qtgui in / for some opengl check
  - qtsvg and qtx11extras need qmake to build, but their packages will
be empty unless qtwidgets is installed in /

> >   - I've only gotten to testing a few packages that are dependencies of
> >     other applications (like VLC), so I may be missing breakages.
> >
> > The patch basically just sets -sysroot when $SYSROOT is defined.  It
> > also needs to set -extprefix to the normal prefix, since otherwise it
> > would default to installing into /sysroot/prefix.  Is anyone involved in
> > qt maintenance more experienced with this and able to comment?
> I'm not the Qt guy but I am the cross guy. I'm not in a position to
> test this right now but it looks good and I love the simplicity of it.
> It's a hell of a lot simpler than Qt4 was. To be honest, we should be
> setting QMAKE_PKG_CONFIG regardless.

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