On Wednesday 18 November 2009 08:24:13 Mauro Carvalho Chehab wrote:
> Hans Verkuil wrote:
> > On Wednesday 18 November 2009 08:04:10 Mauro Carvalho Chehab wrote:
> >> Karicheri, Muralidharan escreveu:
> >>> Mauro,
> >>>
> >>> Thanks to your help, I could finish my documentation today.
> >>>
> >>> But I have another issue with the v4l2-apps.
> >>>
> >>> When I do make apps, it doesn't seem to build. I get the following error
> >>> logs... Is this broken?
> >> Well... no, it is not really broken, but the build system for v4l2-apps
> >> needs serious improvements. There are some know issues on it:
> >> - It doesn't check/warn if you don't have all the dependencies
> >> (qv4l2 and v4l2-sysfs-path require some development libraries
> >> that aren't available per default when gcc is installed - I
> >> think the other files there are ok);
> >> - make only works fine when calling on certain directories (it used to
> >> work
> >> fine if you call it from /v4l2-apps/*) - but, since some patch, it
> >> now requires
> >> that you call make from /v4l2-apps, in order to create
> >> v4l2-apps/include.
> >> After having it created, make can be called from a /v4l2-apps subdir;
> >> - for some places (libv4l - maybe there are other places?), you need to
> >> have the latest headers installed, as it doesn't use the one at the
> >> tree.
> >> - qv4l2 only compiles with qt3.
> >
> > I have a qt4 version available in my v4l-dvb-qv4l2 tree. Just no time to
> > work
> > on a series of patches to merge it in the main repo. And it is missing
> > string
> > control support.
> >
> > If anyone is interested, then feel free to do that work. This new qt4
> > version
> > is much better than the qt3 version.
>
> IMO, the better is to have both versions on separate dirs, and let the
> building
> system to check if qt4 is available. If so, build the qt4 version instead of
> qt3 (a configure script, for example). Otherwise, warn users that it is
> compiling
> a legacy application, due to the lack of the proper dependencies.
I'm not going to maintain the qt3 version. Personally I think it is pointless
having two tools for this and it only creates confusion and unnecessary
maintenance cost. Of course, all this is moot as long as the new version is
still unmerged.
BTW: everything inside v4l2-apps should use the generated headers inside
v4l2-apps/include. These are generated from the headers in the tree and yes,
it would be nice if v4l2-apps/Makefile would have a proper dependency to
generate them. Now only the top-level Makefile knows about it. After that
include directory is generated you can do a make in v4l2-apps.
But libv4l should use those headers and not the installed headers. Something
may have been broken since when I last wrote that code.
Regards,
Hans
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG Telecom
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