[opus] Make check failure on clone from 31 January

[Gregory Maxwell]

On Wed, Feb 5, 2014 at 8:05 AM, Marcello Caramma (mcaramma)
<mcaramma at cisco.com> wrote:
> Hi,
>
> Apologies if this is a known issue, but running make on revision e3187444692195957eb66989622c7b1ad8448b06 fails one of the tests when using fixed point configuration (floating point is ok) on my linux x86.
> Note that libopus1.1, as extracted from the tar ball, is OK.

I can't reproduce with Fedora 19, gcc version 4.8.2 20131212 (Red Hat
4.8.2-7) (GCC) compiled with
CFLAGS='-m32 -O2 -g'  ./configure --enable-fixed-point ; make clean ;
make celt/tests/test_unit_mdct

or with Clang 3.5 on the same system.

None of the fixed point builds on or ci system are throwing errors on
this either.

Can you try compiling without optimizations? Smells like a compiler bug.