path: root/meta/recipes-multimedia
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authorAndreas Müller <>2016-10-03 07:47:16 +0200
committerRichard Purdie <>2016-10-05 00:17:49 +0100
commitdd442652afef1f83fc6c9651976cd3ba28c83c85 (patch)
treed0e68dbb006021676b1d3333d944e4c185739f5b /meta/recipes-multimedia
parent7bab454b0bf0075fbb2a5de06286a9da1df2adc6 (diff)
alsa-lib: allow building ARM thumb again
The directive mentioned in the comment was removed in: commit 326c6802e49e5499e16cf141e1cdb0360fce14aa Author: Riku Voipio <> Date: Fri Feb 7 15:38:58 2014 +0200 alsa-lib: heavy pcm atomics cleanup The following patch comes from the realization that at least ARM code for atomics is quite broken and nobody has cared for a decade. A quick dive shows that only snd_atomic_{read,write}_{begin,end} appear to be used widely. These are implemented using wmb/rmb. Only other use of atomic functions is in pcm_meter.c. The #SND_PCM_TYPE_METER plugin type appears rarely, if ever, used. I presume these days anyone who wants a meter/scope will do in pulseaudio layer instead of alsa. It would seem better fit to have pcm_meter in alsa-plugins instead of alsa-lib, but I guess that would be an ABI break... So instead, I'm proposing here 1. Removal of all hand-crafted atomics from iatomic.h apart from barriers, which are used in snd_atomic_{read,write}_{begin,end}. 2. Using __sync_synchronize as the default fallback for barriers. This has been available since gcc 4.1, so it shouldn't be a problem. 3. Defining the few atomics used by pcm_meter.c withing pcm_meter.c itself, using gcc atomic builtins[1]. 4. Since gcc atomic builtins are available only since gcc 4.7, add a check for that in gcc, and don't build pcm meter plugin if using older gcc. The last point has the impact, that if there actually is someone who 1) uses the meter plugin 2) wants to upgrade to 2014 alsa-lib 3) but does not want to use a 2012+ gcc - that someone will be inconvenienced. Finally remove the unneeded configure check for cpu type. We can trust the gcc to set right flags for us. [1] Signed-off-by: Riku Voipio <> Signed-off-by: Takashi Iwai <> Signed-off-by: Andreas Müller <> Signed-off-by: Ross Burton <> Signed-off-by: Richard Purdie <>
Diffstat (limited to 'meta/recipes-multimedia')
1 files changed, 0 insertions, 6 deletions
diff --git a/meta/recipes-multimedia/alsa/ b/meta/recipes-multimedia/alsa/
index ff47576c54..e313da78e4 100644
--- a/meta/recipes-multimedia/alsa/
+++ b/meta/recipes-multimedia/alsa/
@@ -8,12 +8,6 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=7fbc338309ac38fefcd64b04bb903e34 \
BBCLASSEXTEND = "native nativesdk"
-# sets -D__arm__ on the command line for any arm system
-# (not just those with the ARM instruction set), this should be removed,
-# (or replaced by a permitted #define).
-#FIXME: remove the following
SRC_URI = "${BP}.tar.bz2 \
file://Check-if-wordexp-function-is-supported.patch \
file://avoid-including-sys-poll.h-directly.patch \