Re: [Qemu-devel] [PATCH 0/7] audio: modularize

[Gerd Hoffmann <kraxel@redhat.com>]

On Tue, Mar 06, 2018 at 12:22:49PM +0100, Marc-André Lureau wrote:
> Hi
> 
> On Tue, Mar 6, 2018 at 8:40 AM, Gerd Hoffmann <kraxel@redhat.com> wrote:
> > Add audio driver (host backend) registry.  Add audio module support.
> > Enable module builds for alsa, oss, pulse and sdl.
> >
> > Gerd Hoffmann (7):
> >   audio: add driver registry
> >   audio: add module loading support
> >   build: enable audio modules
> >   audio/alsa: build as module
> >   audio/oss: build as module
> >   audio/pulseaudio: build as module
> >   audio/sdl: build as module
> >
> 
> Is this a problem on my side? (configure
> '--audio-drv-list=oss,alsa,pa,sdl' '--enable-modules')
> 
> elmarco@boraha:~/src/qemu/build (master %)$
> x86_64-softmmu/qemu-system-x86_64 -audio-help
> Failed to open module:
> /home/elmarco/src/qemu/build/x86_64-softmmu/../audio-oss.so: undefined
> symbol: _TRACE_OSS_INVALID_AVAILABLE_SIZE_DSTATE
> Failed to open module:
> /home/elmarco/src/qemu/build/x86_64-softmmu/../audio-alsa.so:
> undefined symbol: _TRACE_ALSA_XRUN_OUT_DSTATE
> Failed to open module:
> /home/elmarco/src/qemu/build/x86_64-softmmu/../audio-pa.so: undefined
> symbol: audio_pt_unlock_and_signal
> Failed to open module:
> /home/elmarco/src/qemu/build/x86_64-softmmu/../audio-sdl.so: undefined
> symbol: audio_pcm_sw_write

Works fine here.  Tried "make clean && make"?

Qemu build system seems to not rebuild object files when the compiler
flags change.  So you can't switch between --enable-modules and
--disable-modules without "make clean" inbetween.  Same issue when
patches switch code from compiled-in to modular and you try an
incremental build.

I've seen only build failues due to this, not module load errors.  But
possibly only because I stopped doing incremental builds when working on
module patches ...

cheers,
  Gerd