New: The QEMU compiled by Buildroot does not support alsa or pulseaudio drivers for soundcard forwarding
https://bugs.busybox.net/show_bug.cgi?id=13791
Bug ID: 13791
Summary: The QEMU compiled by Buildroot does not support alsa
or pulseaudio drivers for soundcard forwarding
Product: buildroot
Version: 2021.02.1
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: Other
Assignee: unassigned at buildroot.uclibc.org
Reporter: wzab01 at gmail.com
CC: buildroot at uclibc.org
Target Milestone: ---
Created attachment 8921
--> https://bugs.busybox.net/attachment.cgi?id=8921&action=edit
The minimalistic Buildroot config that shows the reported problem
I need to emulate the machine (ARM virt 64-bit) which uses the host (Linux running Debian/testing of Ubuntu 2020.04) soundcard. Unfortunately, when I try to run the QEMU compiled by the Buildroot, I get:
./qemu-system-aarch64 --audio-help Environment variable based configuration deprecated. Please use the new -audiodev option.
Equivalent -audiodev to your current environment variables:
(Since you didn't specify QEMU_AUDIO_DRV, I'll list all possibilities) -audiodev id=oss,driver=oss
-audiodev id=none,driver=none
When I have modified the audio-drv-list in package/qemu/qemu.mk as below:
define HOST_QEMU_CONFIGURE_CMDS
unset TARGET_DIR; \
cd $(@D); $(HOST_CONFIGURE_OPTS) CPP="$(HOSTCC) -E" \
./configure \
--target-list="$(HOST_QEMU_TARGETS)" \
--prefix="$(HOST_DIR)" \
--interp-prefix=$(STAGING_DIR) \
--cc="$(HOSTCC)" \
--host-cc="$(HOSTCC)" \
--audio-drv-list="alsa,pa,oss" \
--extra-cflags="$(HOST_QEMU_CFLAGS)" \
--extra-ldflags="$(HOST_LDFLAGS) -lrt -lm" \
--meson=$(HOST_DIR)/bin/meson \
--ninja=$(HOST_DIR)/bin/ninja \
--disable-bzip2 \
--disable-containers \
--disable-curl \
--disable-libssh \
--disable-linux-io-uring \
--disable-sdl \
--disable-vhost-user-blk-server \
--disable-virtiofsd \
--disable-vnc-jpeg \
--disable-vnc-png \
--disable-vnc-sasl \
--disable-tests \
$(HOST_QEMU_OPTS)I get the following error:
Using './build' as the directory for build output
ERROR: alsa check failed
Make sure to have the alsa libs and headers installed.
I have forced the configure script to print the "pkg_config_exe" variable, and it appears that it uses the compiled buildroot-2021.02.01/output/host/bin/pkg-config
Running it by hand, I have stated that it is not aware of the packages "libasound2-dev" and "libpulse-dev" that I have installed in my system.
Running it with "--help" option I've got:
[...]
--keep-system-cflags keep
-I/tmp/BR/buildroot-2021.02.1/output/host/include entries in cflags output
--keep-system-libs keep
-L/tmp/BR/buildroot-2021.02.1/output/host/lib entries in libs output [...]
So it ignores my system libraries and header files!
What can I do to build the QEMU with
PS. For Buildroot 2020.02 I managed to create a patch that enforces compilation of the alsa and pa drivers:
https://github.com/wzab/BR_Internet_Radio/blob/gpio_simple/QemuVirt64/patches/0002-WZab-host-qemu-patched-for-forced-compilation-of-alsa-and-pa-audio.patch
Unfortunately, it doesn't work with the new, meson-based build flow.
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[Buildroot] [Bug 13791] The QEMU compiled by Buildroot does not support alsa or pulseaudio drivers for soundcard forwarding
https://bugs.busybox.net/show_bug.cgi?id=13791
--- Comment #1 from Arnout Vandecappelle <[email protected]> ---
You have to add host-alsa-lib and host-pulseaudio to the QEMU_DEPENDENCIES for this to work. Buildroot does not want to depend on anything pre-installed on the host (if you're OK with stuff that is pre-installed on the host, you can just as well install qemu-system-arm, right?)
Of course, currently there is no host package for alsa-lib or pulseaudio, so you'll have to add them first. And pulsaudio has dependencies for which no host package exits either, so this will take a bit of work...
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[Buildroot] [Bug 13791] The QEMU compiled by Buildroot does not support alsa or pulseaudio drivers for soundcard forwarding
In reply to bugzilla at busybox.nethttps://bugs.busybox.net/show_bug.cgi?id=13791
--- Comment #2 from WZab <[email protected]> ---
I have extracted the configuration of the libpulse and alsa from the system pkgconf:
$ pkgconf libpulse --libs -L/usr/lib/x86_64-linux-gnu -lpulse $ pkgconf libpulse --cflags -D_REENTRANT $ pkg-config alsa --libs -L/usr/lib/x86_64-linux-gnu -lasound $ pkg-config alsa --cflags
Then I have injected them by hand to the "configure" script in the output/build/host-qemu-5.2.0/ :
##########################################
# Sound support libraries probe
audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/,/ /g') for drv in $audio_drv_list; do
case $drv in
alsa | try-alsa)
if true; then
alsa_libs="-L/usr/lib/x86_64-linux-gnu -lasound" alsa_cflags=""
alsa=yes
if test "$drv" = "try-alsa"; then
audio_drv_list=$(echo "$audio_drv_list" | sed -e
's/try-alsa/alsa/')
fi
else
if test "$drv" = "try-alsa"; then
audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-alsa//')
else
error_exit "$drv check failed" \
"Make sure to have the $drv libs and headers installed."
fi
fi
;;
pa | try-pa)
if true; then
libpulse=yes
pulse_libs="-L/usr/lib/x86_64-linux-gnu -lpulse"
pulse_cflags="-D_REENTRANT"
if test "$drv" = "try-pa"; then
audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-pa/pa/')
fi
else
if test "$drv" = "try-pa"; then
audio_drv_list=$(echo "$audio_drv_list" | sed -e 's/try-pa//')
else
error_exit "$drv check failed" \
"Make sure to have the $drv libs and headers installed."
fi
fi
;;After that, and with the following:
# Override CPP, as it expects to be able to call it like it'd
# call the compiler.
define HOST_QEMU_CONFIGURE_CMDS
unset TARGET_DIR; \
cd $(@D); $(HOST_CONFIGURE_OPTS) CPP="$(HOSTCC) -E" \
./configure \
--target-list="$(HOST_QEMU_TARGETS)" \
--prefix="$(HOST_DIR)" \
--interp-prefix=$(STAGING_DIR) \
--cc="$(HOSTCC)" \
--host-cc="$(HOSTCC)" \
--extra-cflags="$(HOST_QEMU_CFLAGS)" \
--extra-ldflags="$(HOST_LDFLAGS)" \
--audio-drv-list="alsa,pa,oss" \
--meson=$(HOST_DIR)/bin/meson \
--ninja=$(HOST_DIR)/bin/ninja \
--disable-bzip2 \
--disable-containers \
--disable-curl \
--disable-libssh \
--disable-linux-io-uring \
--disable-sdl \
--disable-vhost-user-blk-server \
--disable-virtiofsd \
--disable-vnc-jpeg \
--disable-vnc-png \
--disable-vnc-sasl \
--disable-tests \
$(HOST_QEMU_OPTS)
endefin the package/qemu/qemu.mk , I was able to compile QEMU with supported alsa and pa drivers:
./qemu-system-aarch64 --audio-help Environment variable based configuration deprecated. Please use the new -audiodev option.
Equivalent -audiodev to your current environment variables:
(Since you didn't specify QEMU_AUDIO_DRV, I'll list all possibilities) -audiodev id=alsa,driver=alsa
-audiodev id=pa,driver=pa
-audiodev id=oss,driver=oss
-audiodev id=none,driver=none
It is an awful workaround, but at least it works...
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[Buildroot] [Bug 13791] The QEMU compiled by Buildroot does not support alsa or pulseaudio drivers for soundcard forwarding
In reply to bugzilla at busybox.nethttps://bugs.busybox.net/show_bug.cgi?id=13791
--- Comment #3 from WZab <[email protected]> ---
(In reply to Arnout Vandecappelle from comment #1)
Unfortunately we have to use the patched QEMU (to add the GUI-connected GPIO emulation for our students -
http://koral.ise.pw.edu.pl/~wzab/artykuly/Teaching_electronics_disease_virtual_lab.pdf
).
The version for BR 2021.02 is in
https://github.com/wzab/BR_Internet_Radio/tree/gpio_simple_2021.02/QemuVirt64
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[Buildroot] [Bug 13791] The QEMU compiled by Buildroot does not support alsa or pulseaudio drivers for soundcard forwarding
In reply to bugzilla at busybox.nethttps://bugs.busybox.net/show_bug.cgi?id=13791
--- Comment #4 from WZab <[email protected]> ---
Created attachment 8926
--> https://bugs.busybox.net/attachment.cgi?id=8926&action=edit
Patch with temporary work-around
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[Buildroot] [Bug 13791] The QEMU compiled by Buildroot does not support alsa or pulseaudio drivers for soundcard forwarding
In reply to bugzilla at busybox.nethttps://bugs.busybox.net/show_bug.cgi?id=13791
WZab <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #8926|0 |1
is obsolete| |
--- Comment #5 from WZab <[email protected]> ---
Created attachment 8931
--> https://bugs.busybox.net/attachment.cgi?id=8931&action=edit
Patch with temporary work-around
This is a temporary work-around - a patch to the qemu package.
It simply switches to using the standard pkg-config, when the sound libraries are detected and configured. After that the original Buildroot-provided pkg-config is restored.
The correct operation is confirmed on Debian/testing.
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[Buildroot] [Bug 13791] The QEMU compiled by Buildroot does not support alsa or pulseaudio drivers for soundcard forwarding
In reply to bugzilla at busybox.nethttps://bugs.busybox.net/show_bug.cgi?id=13791
--- Comment #6 from WZab <[email protected]> ---
The temporary workaround is also available in the BR_Internet_Radio:
https://github.com/wzab/BR_Internet_Radio/commit/bdf7afed292ec0408fe908df42a4bc298031141a
https://github.com/wzab/BR_Internet_Radio/commit/2117504dc040cdc679e379eee87cde3c498c694d
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[Buildroot] [Bug 13791] The QEMU compiled by Buildroot does not support alsa or pulseaudio drivers for soundcard forwarding
In reply to bugzilla at busybox.nethttps://bugs.busybox.net/show_bug.cgi?id=13791
Yann E. MORIN <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |MOVED
CC| |[email protected]
Status|NEW |RESOLVED--- Comment #7 from Yann E. MORIN <[email protected]> --- Thank you for your report.
The issue tracker for the Buildroot project has been moved to the Gitlab.com issue tracker:
https://gitlab.com/buildroot.org/buildroot/-/issues
We are taking this opportunity to close old issues in this old tracker. If you believe your issue is still relevant, please open one in the new issue tracker.
Thank you!
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