[FFmpeg-devel] [RFC] insufficient VFP check?

[Siarhei Siamashka]

On Sunday 17 January 2010, Reimar D?ffinger wrote:
> On Sat, Jan 16, 2010 at 11:40:34PM +0000, M?ns Rullg?rd wrote:
> > Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:
> > > Hello,
> > > the configure vfp check looks for
> > > fadds s0, s0, s0
> > > However, this detects VFP e.g. for
> > > -mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp
> > > while actual compilation fails with e.g.
> > > libavcodec/arm/dsputil_vfp.S:160: Error: selected processor does not
> > > support `vmov r7,r8,s4,s5' So what is the right solution, replace the
> > > check with something like the failing instruction?
> >
> > What configure line did you use?  It always works for me...
>
> Something a bit silly:
> ./configure --cross-prefix=armv7a-softfloat-linux-gnueabi-
> --extra-cflags="-mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp" --arch=arm
> --cpu=cortex-a8 However doesn't look silly enough to make it break that
> way..

At least gentoo has problems compiling mplayer/ffmpeg with 
armv7a-softfloat-linux-gnueabi toolchain (because it has an extra softfloat 
related patch applied by ebuild), armv7a-unknown-linux-gnueabi is fine.

Don't know about the other distributions.

-- 
Best regards,
Siarhei Siamashka