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Re: -mcpu vs. binutils 2.13.90.0.18

To: Thiemo Seufer <ica2_ts@csv.ica.uni-stuttgart.de>
Subject: Re: -mcpu vs. binutils 2.13.90.0.18
From: Guido Guenther <agx@sigxcpu.org>
Date: Tue, 13 May 2003 13:33:16 +0200
Cc: linux-mips@linux-mips.org
In-reply-to: <20030319001652.GB19189@rembrandt.csv.ica.uni-stuttgart.de>
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On Wed, Mar 19, 2003 at 01:16:52AM +0100, Thiemo Seufer wrote:
> Guido Guenther wrote:
> [snip]
> > > -march=BAR:
> > > Allow opcodes for CPU BAR in addition to the ISA ones.
> > > 
> > > -mtune=BAZ:
> > > Optimize opcode scheduling for CPU BAZ.
> > So to build kernels for say IP22 R5k I'd change the current
> >     GCCFLAGS += -mcpu=r5000 -mips2 -Wa,--trap
> > to 
> >     GCCFLAGS += -mabi=o32 -march=R5000 -mtune=R5000 -Wa,--trap
> > where as for R4X00 I use
> >     GCCFLAGS += -mabi=o32 -march=R4600 -mtune=R4600 -Wa,--trap
> > Correct?
> 
> Yes, this should work. You can leave the -mtune out, since it defaults
> to the value of -march anyway.
Just for completeness: I had to use:
        GCCFLAGS += -mabi=32 -march=r4600 -mtune=r4600 -Wa,--trap
to make gcc-3.3 happy (note the 32 instead of o32). gcc-3.2 doesn't seem
to handle these options correctly at all.
 -- Guido

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