Re: [gpsd-users] gpsd fails with Illegal instruction on old Intel CPU

[Håkan Johansson]

Probably the illegal instruction is

asm volatile("mfence");

in barrier() in gpsd.h (from gpsd.h-tail).  That instruction does not 
exist on senior x86 CPUs.  Where senior is something like age >= Pentium 
II/III. There was a discussion on the gpsd-dev mailing list end of March 
about this ("Restrict the barrier() function to x86 and x86_64").

Cheers,
Haakan


On Sat, 31 Dec 2011, Klaus Klein wrote:

> Am 30.12.2011 00:33, schrieb Klaus Klein:
> > Hi Folks,
> >
> > I just installed gpsd 3.3-5 under Debian GNU/Linux wheezy/sid
> > (3.1.0-1-686-pae) on my old Dell Notebook.
> >
> > ...
> >
> > Unfortunately the start of gpsd ends with an "Illegal instruction".
> >
> > ...
> >
> > Anything I could do to fix this?
>
> I hate to answer my own questions ...
>
> Nevertheless, as described in the thread with the old AMD CPU, compiling with 
> "scons debug=true shm_export=no" seems to fix the problem.
>
> Is this a general issue with 'older' 32-bit CPUs?
> Could/will  it be fixed in the near future?
>
> I'll keep testing
>
> Cheers,
> Klaus