Re: [RFC] Fix for Go32-v2 native woes

[Mark Kettenis <mark.kettenis@xs4all.nl>]

> Date: Tue, 06 Apr 2010 20:45:25 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> > From: "Pierre Muller" <pierre.muller@ics-cnrs.unistra.fr>
> > Date: Tue, 6 Apr 2010 16:15:05 +0200
> > 
> >   I finally managed to find a fix, but it is not straightforward:
> >   I had to add a new xml file in features/i386 directory
> > specific for go32v2 target, that does not read i386-sse.xml.
> >   I had to adapt the code in i386-tdep.c to support
> > missing feature_vector and to set tdesc to
> > tdesc_i386_go32v2 instead of tdesc_i386 when go32v2
> > osabi was detected.
> > 
> >   This allows me to use CVS GDB on DJGPP again.
> > 
> >   I checked with a testsuite run on gcc-farm that nothing changed
> > for at least that other target (amd64-linux).
> > 
> >   Similar fixes might be required for other 'old'
> > i386 targets that do not support SSE registers.
> > 
> >   Comments welcome as usual!
> 
> Thanks.  But I really hope that a much more elegant solution could be
> found.  A general layer of code such as i386-tdep.c should not include
> any code that is specific to certain targets.
> 
> Why do we always read i386-sse.xml or assume that SSE is supported?
> We should not assume any CPU features by default if there are CPUs out
> there which we support that don't have them.

Because that basically was the situation before.  When SSE support was
addid we didn't really have a way to detect whether a target supported
SSE or not.

Does Go32 really have no support for the SSE registers?