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* [Buildroot] [PATCH] gst-ffmpeg: work-around bogus configure logic on SPARC
@ 2017-03-22 23:04 Thomas Petazzoni
  2017-04-04  9:46 ` Thomas Petazzoni
  2017-04-04 21:47 ` Peter Korsgaard
  0 siblings, 2 replies; 3+ messages in thread
From: Thomas Petazzoni @ 2017-03-22 23:04 UTC (permalink / raw)
  To: buildroot

The libav version built into the gst-ffmpeg code produces a bogus
binary on SPARC, which causes the following error of the
check-bin-arch script:

  ERROR: architecture for ./usr/lib/gstreamer-0.10/libgstffmpeg.so is Sparc v8+, should be Sparc
  ERROR: architecture for ./usr/lib/gstreamer-0.10/libgstpostproc.so is Sparc v8+, should be Sparc
  ERROR: architecture for ./usr/lib/gstreamer-0.10/libgstffmpegscale.so is Sparc v8+, should be Sparc

The problem is the following bit of code in
gst-lib/ext/libav/configure:

elif enabled sparc; then

    enabled vis && check_asm vis '"pdist %f0, %f0, %f0"' -mcpu=ultrasparc &&
        add_cflags -mcpu=ultrasparc -mtune=ultrasparc

I.e, it checks if the architecture supports the pdist
instruction... but forces -mcpu to ultrasparc while doing so. So it's
like "let's see if this Ultrasparc instruction exists when I force the
compiler to think I'm using Ultrasparc", which is non-sensical. This
has been fixed later on in libav upstream:

  https://git.libav.org/?p=libav.git;a=commit;h=6aa93689abe8c095cec9fa828c2dee3131008995

However, this commit cannot be backported as-is since the shell
function check_inline_asm did not exist in the old libav version
bundled in gst-ffmpeg.

Therefore, we take the simpler route of disabling the VIS
optimizations on SPARCv8 and Leon3.

Fixes:

  http://autobuild.buildroot.net/results/e82d179c3d4f92ad7423693a4b1d42379a3f5411/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 package/gstreamer/gst-ffmpeg/gst-ffmpeg.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/package/gstreamer/gst-ffmpeg/gst-ffmpeg.mk b/package/gstreamer/gst-ffmpeg/gst-ffmpeg.mk
index b1d8f8b..3992fdf 100644
--- a/package/gstreamer/gst-ffmpeg/gst-ffmpeg.mk
+++ b/package/gstreamer/gst-ffmpeg/gst-ffmpeg.mk
@@ -80,6 +80,12 @@ else
 GST_FFMPEG_CONF_EXTRA_OPTS += --disable-altivec
 endif
 
+# libav configure script misdetects the VIS optimizations as being
+# available, so forcefully disable them.
+ifeq ($(BR2_sparc_v8)$(BR2_sparc_leon3),y)
+GST_FFMPEG_CONF_EXTRA_OPTS += --disable-vis
+endif
+
 ifeq ($(BR2_STATIC_LIBS),)
 GST_FFMPEG_CONF_EXTRA_OPTS += --enable-pic
 endif
-- 
2.7.4

^ permalink raw reply	[flat|nested] 3+ messages in thread

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2017-03-22 23:04 [Buildroot] [PATCH] gst-ffmpeg: work-around bogus configure logic on SPARC Thomas Petazzoni
2017-04-04  9:46 ` Thomas Petazzoni
2017-04-04 21:47 ` Peter Korsgaard

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