COPTS for Makefile LinuxPPC 2000

COPTS for Makefile LinuxPPC 2000

[Michael Norton]

hi,

I am trying to build the OpenGL Heretic game and there are compiler options in t
he Makefile for m68k but not for the PPC.

COPT.m68k = -m68020-60 -O2 -fomit-frame-pointer -D__BIG_ENDIAN__ -D__32BIT__ \
        -DHAVE_ALLOCA_H


was should this statement read if I am going to compile a PPC image on my G4?

thanks,

Mike


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Re: COPTS for Makefile LinuxPPC 2000

[Derek Homeier]

On Fri, 20 Oct 2000 15:17:26 -0700 (PDT), Michael Norton <mnorton@cisco.com> wrote:
>
> I am trying to build the OpenGL Heretic game and there are compiler options in t
> he Makefile for m68k but not for the PPC.
>
> COPT.m68k = -m68020-60 -O2 -fomit-frame-pointer -D__BIG_ENDIAN__ -D__32BIT__ \
>         -DHAVE_ALLOCA_H
>
>
> was should this statement read if I am going to compile a PPC image on my G4?
>
Well, you probably should keep the defines, and possibly the "-fomit-frame-pointer"
as well, so leave everything after that unchanged. It's possible you need
"-fsigned-char" in addition. You obviously wouldn't want the "-m68020-60"
which turns on m68k-specific tuning. You might simply try "-O2" or "-O3" for a
first run. There also are some architecture-specific flags available on PPC,
such as"-mcpu=604", don't know if there is a flag for 750 or even 7400 yet.
You should look at the gcc info page for more details on the different
optimizations (under "Invoking GCC::"). Chances are you won't need
terribly agressive optimization if that game actually runs on a 68k :-).

HTH,
							Derek


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Re: COPTS for Makefile LinuxPPC 2000

[William Blew]

On Mon, 23 Oct 2000, Derek Homeier wrote:

> such as"-mcpu=604", don't know if there is a flag for 750 or even 7400 yet.

As of gcc 2.95.2 (at least) there is a -mcpu=750 (or -mtune=750) option
and on my beige G3/266 it was good for about a 11% throughput improvement
on the utah-glx's memory bandwidth benchmarks.

--
William Blew, wblew@home.com
Gamer by Choice, Geek by Birth


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