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Re: Multilib support for 68040



>> On Mon, Jan 21, 2002 at 12:26:18PM -0800, Glynn Smith wrote:
>> > I am using gcc 2.95.2 configured as a Cross m68k compiler hosted on
>> > PPC-LINUX.  The standard multi-lib support seems to be for 68000 68020
>> > 68881 & soft-float.
>> 
>> and cpu32 and m5200.  :)
>
>And at least one person I know wants the 68060 added so you can avoid
>generating instructions that it has to emulate.

I'll assume that you configure with --target=m68k-elf

You could modify gcc/config/m68k/t-m68kelf and change the following
lines to build libgcc.a for -m68040 and -m68060, and convince the
compiler to select it at link time:

MULTILIB_OPTIONS = m68000/m68020/m5200/mcpu32/m68040/m68060 m68881/msoft-float
MULTILIB_DIRNAMES =
MULTILIB_MATCHES = m68000=mc68000 m68000=m68302 mcpu32=m68332 m68020=mc68020 m68040=m68040 m68060=m68060
MULTILIB_EXCEPTIONS = m68000/msoft-float m5200/m68881 m5200/msoft-float mcpu32/m68881 mcpu32/msoft-float m68040/m68881 m68040/msoft-float m68080/m68881 m68060/msoft-float

You'll have to run configure again, make clean; make; make install,
and then:

[pbarada: ~]> /tmp/crap/bin/m68k-elf-gcc -m68040 -print-libgcc-file-name
/tmp/crap/lib/gcc-lib/m68k-elf/3.1/m68040/libgcc.a

Which means it will link in the -m68040 built version of libgcc.a...

Of course its a whole 'nother story if the assembler code in libgcc.a
isn't optimized for the 68040...

-- 
Peter Barada                                   Peter.Barada@motorola.com
Wizard                                         781-852-2768 (direct)
WaveMark Solutions(wholly owned by Motorola)   781-270-0193 (fax)

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