[mythtv-users] CMake remembers too much

[James Abernathy]

On Tue, Feb 11, 2025 at 1:47 PM David Hampton <mythtv at love2code.net> wrote:

> On Tue, 2025-02-11 at 13:26 -0500, James Abernathy wrote:
> >
> > On Tue, Feb 11, 2025 at 1:05 PM David Hampton via mythtv-users
> > <mythtv-users at mythtv.org> wrote:
> > >
> > > Are you installing into the same CMAKE_INSTALL_PREFIX directory as
> > > before?  Try deleting that first.  The cmake builds will look at
> > > the
> > > install directory to see if exiv2 and ffmpeg have already been
> > > built,
> > > and will reuse those earlier builds if possible.  You could also
> > > try
> > > building mythtv by adding -DLIBS_USE_INSTALLED=OFF to the "cmake --
> > > preset" command.  That should ignore any previously built libraries
> > > and
> > > rebuild everything.
> > >
> > > Its also possible since you've copied your install to /usr before,
> > > so
> > > the builds might be picking up bad information from there.  Try
> > > this
> > > command:
> > >
> > >   find /usr -name libmyth*.pc
> > >
> > > If that returns any file names, delete those files.  Also check to
> > > see
> > > if the files ffnvcodec.pc and mythexiv2.pc exist in the same
> > > directory
> > > as the others, and delete those too.  This shouldn't be necessary
> > > if
> > > you set the LIBS_USE_INSTALLED flag.
> > >
> > > David
> > >
> >
> >
> > Thanks for the reply. I did delete all files in my $HOME directory
> > and started over.  So nothing of the previous cmail build was there.
> > I'm not sure where to put the -DLIBS_USE_INSTALL=off since I'm doing
> > a mythtv-light build this time.
>
> I can't help there.  I haven't done any mythtv-light builds.
>
> If you want to always rebuild exiv2 and ffmpeg, you could create the
> file ~/.config/MythTV/BuildOverridesPost.cmake with the line:
>
>    set(LIBS_USE_INSTALLED OFF)
>
> >  So deleting the files that showed up may be the easiest option.
> >
> >  ls -l /usr/local/lib/pkgconfig/
> > -rw-r--r-- 1 root root 208 Feb 11 07:06 ffnvcodec.pc
> > -rw-r--r-- 1 root root 459 Feb 11 07:06 libmythavcodec.pc
> > -rw-r--r-- 1 root root 647 Feb 11 07:06 libmythavdevice.pc
> > -rw-r--r-- 1 root root 575 Feb 11 07:06 libmythavfilter.pc
> > -rw-r--r-- 1 root root 483 Feb 11 07:06 libmythavformat.pc
> > -rw-r--r-- 1 root root 425 Feb 11 07:06 libmythavutil.pc
> > -rw-r--r-- 1 root root 393 Feb 11 07:06 libmythpostproc.pc
> > -rw-r--r-- 1 root root 398 Feb 11 07:06 libmythswresample.pc
> > -rw-r--r-- 1 root root 391 Feb 11 07:06 libmythswscale.pc
> > -rw-r--r-- 1 root root 288 Feb 11 07:06 mythexiv2.pc
>
> You can delete all of these.  These are how one sub-project in the
> cmake mythtv build finds the results of the previous cmake sub-
> projects, and how repeated builds of MythTV detect that libraries like
> FFmpeg have already been built.  They will get recreated the next time
> you build MythTV with an install directory of /usr/local.
>
> David
>

Thanks for the details.  I was able to build completely mythtv-light
without the previous stuff being remembered.  Now onto testing.

JIm
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