Re: [Qemu-devel] [RfC PATCH] gtk: switch to gtk3 by default, depricate gtk2.

["Daniel P. Berrange" <berrange@redhat.com>]

On Thu, Jul 07, 2016 at 03:52:20PM +0100, Peter Maydell wrote:
> On 7 July 2016 at 15:27, Gerd Hoffmann <kraxel@redhat.com> wrote:
> > This patch drops gtk version detection.  gtk3 is used unless you
> > explicitly ask for gtk2.  Additionally configure prints an error
> > message in case it finds gtk2 but not gtk3.
> >
> > Old behavior:
> >   only gtk3 installed     -- use gtk3
> >   both gtk2+3 installed   -- use gtk2
> >   only gtk2 installed     -- use gtk2
> >   no gtk installed at all -- build without gtk ui
> >
> > New behavior:
> >   only gtk3 installed     -- use gtk3
> >   both gtk2+3 installed   -- use gtk3
> >   only gtk2 installed     -- error out
> >   no gtk installed at all -- build without gtk ui
> >
> > It is still possible to build with gtk2, but you have to explicitly
> > ask for it using --with-gtkabi=2.0.
> >
> > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> > ---
> >  configure | 22 ++++++++++++++--------
> >  1 file changed, 14 insertions(+), 8 deletions(-)
> >
> > diff --git a/configure b/configure
> > index e9090a0..af49eed 100755
> > --- a/configure
> > +++ b/configure
> > @@ -2154,14 +2154,20 @@ fi
> >  # GTK probe
> >
> >  if test "$gtkabi" = ""; then
> > -    # The GTK ABI was not specified explicitly, so try whether 2.0 is available.
> > -    # Use 3.0 as a fallback if that is available.
> > -    if $pkg_config --exists "gtk+-2.0 >= 2.18.0"; then
> > -        gtkabi=2.0
> > -    elif $pkg_config --exists "gtk+-3.0 >= 3.0.0"; then
> > -        gtkabi=3.0
> > -    else
> > -        gtkabi=2.0
> > +    gtkabi=3.0
> > +    if !$pkg_config --exists "gtk+-3.0 >= 3.0.0" &&
> > +       $pkg_config --exists "gtk+-2.0 >= 2.18.0"; then
> > +        echo ""
> > +        echo "ERROR: gtk3 not found, gtk2 is present though."
> > +        echo ""
> > +        echo "We strongly recomment to install the gtk3 devel packages and"
> 
> "recommend"
> 
> > +        echo "build qemu with gtk3.  gtk2 support is depricated and will be"
> > +        echo "dropped (removal scheduled for 2018)."
> > +        echo ""
> > +        echo "If it is really your intention to build qemu with gtk2 re-run"
> > +        echo "configure with --with-gtkabi=2.0."
> > +        echo ""
> > +        exit 1
> >      fi
> >  fi
> 
> I'm not really convinced that we should do this, though. Generally
> configure should just work with what you have, unless you specifically
> use options to ask it for a feature.

We could just print the message and then set  gtk=no instead of 'exit 1'


Regards,
Daniel
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