Cross Tools Help

[Joel Sherrill]

David Brown wrote:
> 
> > Dear Mr.Gatliff,
> >
> > When i build a m68k-elf cross tool chain, during configure step i
> > specify target=m68k-elf and the toolset is built for all families of m68k
> > like CPU's 68K, 68020, 68030, 68040, etc.
> >
> > If i want to build the toolset for a particular CPU only (say
> > 68020), how do i do it?
> >
> 
> It's the same toolset, since the CPUs are very similar.  To specify the
> exact CPU type, use a compiler flag such as "-m68020".  If you don't use
> such a flag, the code generated will be restricted to instructions that are
> available on all the chips - thus it will avoid instructions such as the bit
> manipulation instructions that were introduced in the 68020.

I don't believe this statement is correct.  The default for
the m68k-elf toolset is 68020 with FPU.

It is better to specify the most correct CPU CFLAGSs and not depend upon
what the default is.

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--joel sherrill

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