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From: Peter Korsgaard <peter@korsgaard.com>
To: buildroot@busybox.net
Subject: [Buildroot] [PATCH] gst-ffmpeg: work-around bogus configure logic on SPARC
Date: Tue, 04 Apr 2017 23:47:30 +0200	[thread overview]
Message-ID: <87k26zu9ot.fsf@dell.be.48ers.dk> (raw)
In-Reply-To: <1490223896-6063-1-git-send-email-thomas.petazzoni@free-electrons.com> (Thomas Petazzoni's message of "Thu, 23 Mar 2017 00:04:56 +0100")

>>>>> "Thomas" == Thomas Petazzoni <thomas.petazzoni@free-electrons.com> writes:

 > 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>

I take these VIS instructions cause runtime errors with the older sparc
cores?

Committed to 2017.02.x, thanks.

-- 
Bye, Peter Korsgaard

      parent reply	other threads:[~2017-04-04 21:47 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-22 23:04 Thomas Petazzoni
2017-04-04  9:46 ` Thomas Petazzoni
2017-04-04 21:47 ` Peter Korsgaard [this message]

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