[AD] processor specific opimisations.

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hi! just changed the flags for specifying which processor to optimize for.
in other words i removed PGCC, PENTIUMONLY and I686_ONLY and replaced them
with TARGET_ARCH_COMPAT, TARGET_ARCH_EXCL and TARGET_OPTS which allows for a
more generalised way of using custom optimisations.

note: the reason why i didn't just use one TARGET_ARCH variable is that the
braindead MS-DOS command interpreter didn't allow me to have equal signs in
the text string so that:
set TARGET_ARCH=-march=i586
wouldn't work even if the string was quoted.

patch has been committed to repository. i will change the rest of the
platforms later today. ps! george; simmilar configure options will be nice
to have on the unix build as well, if you implement it then you can remove
the --pentium-opts option.

-henrik

Attachment: targetarch.diff.gz
Description: GNU Zip compressed data



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