Bug#766630: supercollider: ftbfs on ppc64el -- error: invalid parameter combination for AltiVec intrinsic

[Konstantinos Margaritis]

On Fri, 24 Oct 2014 12:39:18 -0200
ferseiti at br.ibm.com wrote:
> > In any case, perhaps the solution is to disable supernova in ppc64el
> > as well instead of adding custom flags.
> 
> Simply disabling it for ppc64el did not do the work (completely), but
> you can test it if you want =)

The problem is that in ppc64el the default compile flags include -mvsx
-which also implies altivec support, so just disabling supernova
doesn't work, the compiler will still try to build the altivec stuff.
Doing a simple :

$ gcc -dM -E - < /dev/null|grep ALTIVEC
#define __ALTIVEC__ 1
#define __APPLE_ALTIVEC__ 1

on a ppc64le system will show why explicitly disabling it is needed.
Evenmore so, even if it worked, much of the code assumes 32-bit
pointers (eg. a table lookup in server/plugins/OscUGens.cpp:1541, so
the code would break on ppc64le as it's 64-bit and little-endian.
A lot of stuff would have to be fixed for that. So, unless/until it's
fixed and tested for ppc64le, there isn't much one can do apart from
disabling altivec completely.

> I think Konstantinos would be able to give you more accurate answers
> to your questions regarding altivec and simd in general. He knows a
> lot of that stuff.
> He is cc'ed (markos).

Thanks, I just like the stuff :)

Regards

Konstantinos
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