Re: [Bug-gsl] [Help-gsl] test release for gsl 1.16

[Patrick Alken]

I opened another ticket (39171) to track the -ffast-math issue. I 
believe it will be a significant amount of work to get make check to 
succeed with -ffast-math so I don't see this being solved any time soon 
- and I'm not even sure its possible, or even desirable, to rewrite all 
of the affected routines in a way which will run consistently with these 
optimizations.

For the other intel specific bug (39152), I agree it would be useful to 
get make check to work out of the box with icc. One problem though is I 
think older versions of icc don't have the -fp-model flag...they 
required turning on/off many different optimization options, so 
unfortunately any autoconf foo will be ugly. Maybe we should just add 
the -fp-model precise when icc > X.XX version is detected

Patrick

On 06/05/2013 04:48 AM, Rhys Ulerich wrote:
> Hi Patrick,
>
> Thank you for investigating.
>
> > To turn off the unsafe intel optimizations, use:
> >
> > make CFLAGS="-fp-model precise -g -O2"
> >
> > These flags pass all tests for me with icc 13.0.1. Could you check this with
> > your 12.1 and 13.1?
> With this CFLAGS setting, my 12.1 and 13.1 builds pass make check.
>
> > If it works I think we can close this bug.
> Should we add autoconf foo to prevent Intel from shooting the user in the foot?
>
> > I suppose its
> > another (rather complicated) question whether we want to get GSL to pass all
> > the tests with gcc -ffast-math.
> Agreed.  Think that's worth a ticket?  In my work I tend to gather
> fast-math safe logic into one convenience library, no-fast-math into
> another convenience library, and then create the installed .so from
> those two outputs.  This permits using -fsomething-sane only where
> necessary.
>
> - Rhys