PortAudio: Disable sndio in PortAudio to avoid missing -lsndio errors

[shengwen-tw]

Overview

Fixes a compilation error introduced in #76, where the make all target fails during the build of the PortAudio library on GNU/Linux systems.

The failure was caused by PortAudio's configure script automatically enabling the sndio backend when libsndio-dev headers are present, which leads to linker errors due to missing -lsndio.

To avoid this, we now explicitly pass --without-sndio to PortAudio’s configure script. This ensures that sndio support is disabled regardless of system headers, eliminating the need for -lsndio and fixing the build.

Environment

• Linux kernel: 6.2.6-76060206-generic
• Distribution: Ubuntu 22.04.5 LTS (Jammy Jellyfish)

Error Log

shengwen@pop-os:~/buildfarm/semu$ make all
  LD	semu
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o): in function `BlockingGetStreamWriteAvailable':
/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:516: undefined reference to `sio_pollfd'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:524: undefined reference to `sio_revents'
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o): in function `BlockingGetStreamReadAvailable':
/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:495: undefined reference to `sio_pollfd'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:503: undefined reference to `sio_revents'
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o): in function `BlockingWriteStream':
/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:480: undefined reference to `sio_write'
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o): in function `BlockingReadStream':
/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:440: undefined reference to `sio_read'
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o): in function `sndioThread':
/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:230: undefined reference to `sio_write'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:187: undefined reference to `sio_read'
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o): in function `OpenStream':
/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:265: undefined reference to `sio_initpar'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:325: undefined reference to `sio_open'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:328: undefined reference to `sio_setpar'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:333: undefined reference to `sio_getpar'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:340: undefined reference to `sio_close'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:352: undefined reference to `sio_close'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:404: undefined reference to `sio_close'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:382: undefined reference to `sio_close'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:330: undefined reference to `sio_close'
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o):/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:358: more undefined references to `sio_close' follow
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o): in function `StopStream':
/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:612: undefined reference to `sio_stop'
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o): in function `CloseStream':
/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:630: undefined reference to `sio_close'
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o): in function `StartStream':
/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:563: undefined reference to `sio_start'
/usr/bin/ld: /home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:574: undefined reference to `sio_write'
/usr/bin/ld: portaudio/lib/.libs/libportaudio.a(pa_sndio.o): in function `StopStream':
/home/shengwen/buildfarm/semu/portaudio/src/hostapi/sndio/pa_sndio.c:612: undefined reference to `sio_stop'
collect2: error: ld returned 1 exit status
make: *** [Makefile:154: semu] Error 1

[shengwen-tw]

@Cuda-Chen:
Hi, could you help me check the package dependencies here?
Thanks.

[Cuda-Chen]

@shengwen-tw ,

I can help to check the package dependencies.
While checking, here is the environment of mine for your reference:

• Distribution: Ubuntu 22.04.5 LTS (Jammy Jellyfish)
• Linux Kernel: 5.15.0-141-generic (using uname -r)

[Cuda-Chen]

Hi @shengwen-tw ,

It seems that PortAudio somehow uses sndio as an audio multiplexer on your environment.
You may visit the homepage of sndio for more information.

So you may choose one of the following option:

1. Just install libsndio-dev.
2. Force PortAudio to use PulseAudio/PipeWire as there are more common on many Linux distributions, including Ubuntu.

[shengwen-tw]

@Cuda-Chen
Hi, I’ve updated the pull request to explicitly disable sndio support by passing the --without-sndio flag.
Could you help verify whether virtio-snd still functions correctly with this change?
Thanks.

[Cuda-Chen]

Hi @shengwen-tw ,

I have verified that the change functions correctly on my environment.

[jserv]

Thank @shengwen-tw for contributing!