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Date: Tue, 13 Sep 2016 20:06:49 +0200
Subject: incompatibility between libtheora/mmx and musl ?


Libtheora contains an assembler part for ia32 and x86_64 which has been
in use for many years, with at least both glibc and uclibc.

Now, musl-based builds of libtheora for ia32 with this code enabled
lead to the encoder segfaulting. No problem when using the C version.

This is seen when building at Aetey. Ffmpeg in Alpine exhibits the same
problem, too (strictly speaking, possibly another problem but ffmpeg
crashes there with the same pattern, when encoding to theora).

People at Xiph do not have any musl-based system and want really detailed
debugging info which implies tracing through musl and following malloc's
internal data (which is what seems to become corrupted).

In other words, the detailed knowledge (xiph and musl) is located
separately from each other and also from the motivation (aetey, alpine
and possibly others).

I would appreciate some help and suggestions. The alternative is diving
into mmx-assembler and musl code or resorting to C-only routines which
give roughly half of the performance of the assembler ones.

More details are there at

There is also a corresponding


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