Re: Small change in NSObject.m ASM needed for PowerPC build

[David Ayers]

Am Sonntag, den 03.05.2009, 17:30 +0100 schrieb David Chisnall:
> On 3 May 2009, at 17:26, Riccardo Mottola wrote:
> 
> > David Chisnall wrote:
> >> On i386, you need -march=i586 or higher for this to work.  The  
> >> existing code will break at runtime, rather than link time, on an  
> >> 80486 and earlier, and so I assume (from the fact no one has  
> >> complained) that no one is using GNUstep on a 386/486.
> >>
> > Well, how old is that code? Up to about a year ago I built and used  
> > GNUstep on a 486-class machine, although the CPU was not genuine  
> > intel but a compatible processor which was based on 488 ISA, it did  
> > work...
> 
> As I said in my other email, I was mistaken about when the atomic ops  
> were introduced.  They should work with -march=486, not just - 
> march=586 - it works for me with no manually-set CFLAGS or modified  
> GNUmakefile, on GCC 4.2.

I could imagine that the distribution kernels/assemblers were configured
to support only a subset of the features -march=486 or lower.

I think the way to move forward is to add a configure option/test which
would fallback to a more portable yet less efficient implementation.

I can help with the configure.ac snippets if you wish.  But wrt to the
correct implementation I'd like to defer to you.

Cheers,
David