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Re: Support for newer gcc/gas options

To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Subject: Re: Support for newer gcc/gas options
From: Dimitri Torfs <dimitri@sonycom.com>
Date: Wed, 21 Jan 2004 19:35:51 +0100
Cc: linux-mips@linux-mips.org
In-reply-to: <20040121145120.GA14288@sonycom.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20031223114644.GA5458@sonycom.com> <Pine.LNX.4.55.0312231303030.27594@jurand.ds.pg.gda.pl> <Pine.LNX.4.55.0401201332080.12841@jurand.ds.pg.gda.pl> <20040120204026.GA9470@sonycom.com> <Pine.LNX.4.55.0401211449170.11137@jurand.ds.pg.gda.pl> <20040121145120.GA14288@sonycom.com>
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On Wed, Jan 21, 2004 at 03:51:20PM +0100, Dimitri Torfs wrote:
> On Wed, Jan 21, 2004 at 03:09:12PM +0100, Maciej W. Rozycki wrote:
> >  But do we care of the ISA?  I don't think so -- it's just a leftover from
> > the days the MIPS world was less complicated.  If gcc 3.2 correctly emits
> > code for the selected processor and obeys the selected ABI, then
> > everything is fine.  Are the binaries correct?  If so, I'd like to apply
> > the patch.
> 
> I actually had problems compiling when the -mips3 was not set. The
> compiler choked on compiling some empty file, if I remember correctly.
> I will try again later to see what exactly went wrong.

Compiler choked on the first file it tries to compile: gcc added
-mips1 automatically to the as command line which conflicts with the
-Wa,--trap option:

/usr/local/lib/gcc-lib/mips-linux/3.2.2/../../../../mips-linux/bin/as
 -G 0 -O2 -g0 -32 -march=r4100 -v -mips1 -non_shared -32 -march=r4100
 --trap -o scripts/.tmp_empty.o -
Assembler messages:
Error: trap exception not supported at ISA 1

Removing the line which unsets the gas_isa option makes it work again:
/usr/local/lib/gcc-lib/mips-linux/3.2.2/../../../../mips-linux/bin/as
-G 0 -O2 -g0 -32 -march=r4100 -v -mips1 -non_shared -32 -march=r4100
-mips3 --trap -o scripts/.tmp_empty.o

Dimitri


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