On Mon, 19 Apr 1999, Erik E. Fair wrote:

: As I understood it, NetBSD already configures gcc for "mc68020" as the
: baseline minimum, but no higher so that a binary built on one m68k system
: will run on all of them. Users can, of course, recompile their worlds to
: optimize for what they have.

Right.  What -m68020-40 does is a little different, though:  it uses only
MC68020 or higher instructions, leaves out those instructions that are
troublesome on 68040, and tunes the instruction scheduler to the instruction
_timings_ of the 68040.  It's like -m68020 -mtune=68040 but not quite.

AFAIK, there isn't a -m68020-60, but I could be mistaken as I haven't looked
at the m68k gcc configs in a while.

-- 
-- Todd Vierling (Personal tv@pobox.com; Bus. todd_vierling@xn.xerox.com)