[xine-user] Warning: ffmpeg miscompiled in xine

[Mario R. <mar...@go...>]

Hi,

I've recently upgraded to xine-lib-1.1.4 (which I've compiled from
sources) and most of the time I get this warning from ffmpeg:

"Compiler did not align stack variables. Libavcodec has been miscompiled
and may be very slow or crash. This is not a bug in libavcodec,
but in the compiler. Do not report crashes to FFmpeg developers."

My system is Fedora Core 5, gcc 4.1.1 (RPM).
This is the configure I use

./configure --without-esound --without-arts

After a bit of investigation I've found a compiler switch that could
be the cause

-mpreferred-stack-boundary=2

which is in all xine's Makefiles. This switch is enabled (if
supported) from "m4/optimizations.m4".
Without this switch xine seems to work and no warning is reported.

FFMPEG's developpers don't like this switch

http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2007-February/052348.html

I don't have a fully understanding of the whole situation and it's
possible that I've done something wrong.

Does anybody know more about it?

Cheers.