Re: [PULL 00/13] qtests, kconfig and misc patches

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

On Mon, Feb 03, 2020 at 02:50:07PM +0000, Peter Maydell wrote:
> On Mon, 3 Feb 2020 at 14:30, Thomas Huth <thuth@redhat.com> wrote:
> >
> > On 03/02/2020 15.04, Peter Maydell wrote:
> > > On Mon, 3 Feb 2020 at 12:38, Thomas Huth <thuth@redhat.com> wrote:
> > >>
> > >>  Hi Peter,
> > >>
> > >> the following changes since commit 28db64fce555a03b4ca256d5b6f4290abdfbd9e8:
> > >>
> > >>   Merge remote-tracking branch 'remotes/stefanha/tags/tracing-pull-request' into staging (2020-01-31 17:37:00 +0000)
> > >>
> > >> are available in the Git repository at:
> > >>
> > >>   https://gitlab.com/huth/qemu.git tags/pull-request-2020-02-03
> > >>
> > >> for you to fetch changes up to 585c138628bbf22ea8e740b2f4f1a3ed0274ebe8:
> > >>
> > >>   trivial: Remove xenfb_enabled from sysemu.h (2020-02-03 10:33:57 +0100)
> > >>
> > >> ----------------------------------------------------------------
> > >> * Current qtests queue
> > >> * Some Kconfig updates
> > >> * Some trivial clean-ups here and there
> > >> ----------------------------------------------------------------
> > >
> > > All the incremental rebuilds failed:
> > >
> > > Linux cam-vm-266 4.15.0-70-generic x86_64
> > > From git://git-us.linaro.org/people/pmaydell/qemu-arm
> > >    f31160c7d1..f9e931a1d9  staging    -> pmaydell/staging
> > > make: Entering directory '/home/petmay01/qemu-for-merges/build/w64'
> > > make[1]: Entering directory '/home/petmay01/qemu-for-merges/slirp'
> > > make[1]: Nothing to be done for 'all'.
> > > make[1]: Leaving directory '/home/petmay01/qemu-for-merges/slirp'
> > >   CC      qga/main.o
> > >   CC      stubs/machine-init-done.o
> > >   CC      stubs/replay-user.o
> > >   CC      stubs/semihost.o
> > >   CC      qemu-img.o
> > >   CC      qemu-io.o
> > >   CC      chardev/char.o
> > > make: *** No rule to make target
> > > '/home/petmay01/qemu-for-merges/hw/bt/Kconfig', needed by
> > > 'aarch64-softmmu/config-devices.mak'.  Stop.
> > > make: *** Waiting for unfinished jobs....
> > >   CC      chardev/char-mux.o
> > > make: Leaving directory '/home/petmay01/qemu-for-merges/build/w64'
> >
> > Oh, they are still failing??? Why are there still references to
> > hw/bt/Kconfig in these config-devices.mak files, I'd expect that they
> > would have been regenerated at least once during the past week?
> 
> build/all/aarch64-softmmu/config-devices.mak.d was most recently
> touched this morning, and it still includes hw/bt/Kconfig in its
> dependency list. I think this is because minikconf will still put
> a Kconfig file into the .d file it generates even if the Kconfig
> file happens to be empty.
> 
> And make doesn't have any rules that tell it that config-devices.mak.d
> need to be updated either:
> $ make -C build/all -n aarch64-softmmu/config-devices.mak.d
> make: Entering directory '/home/petmay01/linaro/qemu-for-merges/build/all'
> make[1]: Entering directory '/home/petmay01/linaro/qemu-for-merges/slirp'
> make[1]: Nothing to be done for 'all'.
> make[1]: Leaving directory '/home/petmay01/linaro/qemu-for-merges/slirp'
> make: Nothing to be done for 'aarch64-softmmu/config-devices.mak.d'.
> make: Leaving directory '/home/petmay01/linaro/qemu-for-merges/build/all'
> 
> or that it needs to rerun minikconf, which would update the .mak.d.
> 
> An extremely cheesy workaround would be if the commit which
> removes the hw/bt/Kconfig also touches configure; then Make
> will know it needs to rerun configure, which will (among
> other things) blow away all the config-devices.mak.d and
> force rerunning of minikconf.
> 
> I don't know what the correct additional makefile magic
> would be that would cause us to automatically get deletion
> of a Kconfig file right; maybe Paolo does?

I guess this would need some munging of config-host.mak rule in the
Makefile. config-host.mak would need to depend on something which
scan for references to deleted Kconfig files, and then forces a re-run
of config.status in some manner. Don't know how we'd write such a
beast off hand though.


Regards,
Daniel
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