[libcamera-devel] [PATCH v2 1/3] apps: qcam: Port to Qt 6

[Laurent Pinchart]

On Mon, Jun 24, 2024 at 02:15:22PM +0100, Kieran Bingham wrote:
> Quoting Neal Gompa (2024-06-23 08:10:06)
> > On Wed, May 15, 2024 at 1:13 AM Neal Gompa wrote:
> > > On Mon, Apr 22, 2024 at 5:31 AM Kieran Bingham wrote:
> > > > Quoting Neal Gompa via libcamera-devel (2024-01-21 22:39:53)
> > > > > Open source Qt 5 has been effectively end of life since the release
> > > > > of Qt 6, and Qt 6 has current LTS releases now.
> > > > >
> > > > > This change ports qcam to Qt 6.2 and drops some of the baggage related
> > > > > to Qt 5 that is no longer applicable.
> > > >
> > > > It seems that the upgrade to Qt6 also breaks the positioning of the 'No
> > > > Image' background in qcam when you stop the camera.
> > > >
> > > > Could you check that please?
> > >
> > > Sorry it took me a while to get back to this, but I could not
> > > reproduce this issue.
> > >
> > > Here's what I see: https://i.imgur.com/6YMrBWm.png
> 
> I don't know what happened with my previous testing of the image
> centering, but I can't reproduce it now either so lets assume that was
> just a problem somewhere between my keyboard and chair :D
> 
> > Ping to get this patch landed. It's been six months now...
> 
> Well - before we were gated by the fact that we still had to support
> Ubuntu 22.04 LTS while it was current...
> 
> Retesting now...
> 
> sudo apt-get install libtiff-dev qt6-base-dev qt6-tools-dev-tools
> qt6-tools-dev-tools is already the newest version (6.2.4-1).
> libtiff-dev is already the newest version (4.3.0-6ubuntu0.9).
> qt6-base-dev is already the newest version (6.2.4+dfsg-2ubuntu1.1).
> 
> Run-time dependency qt6 (modules: Core, Gui, OpenGL, OpenGLWidgets, Widgets) found: NO (tried pkgconfig)
> 
> src/apps/qcam/meson.build:4:10: ERROR: Dependency "qt6" not found, tried pkgconfig
> 
> Checking the meson-log:
> 
> env[PKG_CONFIG]: /usr/bin/pkg-config
> -----------
> Called: `/usr/bin/pkg-config --modversion Qt6Core` -> 1
> stderr:
> Package Qt6Core was not found in the pkg-config search path.
> Perhaps you should add the directory containing `Qt6Core.pc'
> to the PKG_CONFIG_PATH environment variable
> No package 'Qt6Core' found
> -----------
> detected Qt6 None pkg-config dependency does not have proper tools support, ignoring
> Run-time dependency qt6 (modules: Core, Gui, OpenGL, OpenGLWidgets, Widgets) found: NO (tried pkgconfig)
> 
> src/apps/qcam/meson.build:4:10: ERROR: Dependency "qt6" not found, tried pkgconfig
> 
> Argh ... so Ubuntu-22.04 is still broken... But 'perhaps' we can ignore
> that if 22.04 is no longer supported - except it breaks /my/ build/usage
> of qcam :-(

Ubuntu 24.04 has just been released, and 22.04 has standard support
until April 2027. I'd like to support it for a bit longer *if possible*,
at least to give users some more time to upgrade.

Is there a way to get the Qt 6 pkgconfig fix backported to Ubuntu 22.04,
or is that a pipe dream ?

-- 
Regards,

Laurent Pinchart