[Debian-science-sagemath] linbox: FTBFS on i386: illegal instruction in test-{cra, charpoly}

[Doug Torrance]

Control: reassign -1 src:givaro

On 11/29/2016 09:58 AM, Tobias Hansen wrote:
> I think I figured out at least the test failures with "Illegal
> instruction" on i386. The problem is that givaro is built using cpu
> extensions that are not allowed.
>
> Jerome figured out in [1] that the problem happens when givaro code is
> called. And sure enough:
>
> objdump -S /usr/lib/i386-linux-gnu/libgivaro.so.9.0.0 | grep
> '\b\(ymm\|zmm\|vfm\)'
>     15411:	c4 e3 79 6b 8b a4 29 	vfmaddsd %xmm2,-0x1d65c(%ebx),%xmm0,%xmm1
>     154d1:	c4 e3 69 6b 8b ac 29 	vfmaddsd %xmm0,-0x1d654(%ebx),%xmm2,%xmm1
>
> And in the i386 build logs for givaro there are these flags:
> -mmmx -mpopcnt -msse -msse2 -msse3 -msse4.1 -msse4.2 -msse4a -mavx
> -mfma4 -mfpmath=sse
>
> Do you have time in the next days to disable these flags? Otherwise I
> can do it. (I'm not sure if some of these flags (mmx, sse ?) are allowed
> on i386 and didn't find that info. Ximin, do you know this?)

Sure, I can take a look.  I think it should be a simple --disable-simd 
in d/rules (we did the same in fflas-ffpack).

Doug