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SubjectRe: Intel Makefile Suggestion
Date

-----Original Message-----
From: Matthias Andree <mandree@sx1.HRZ.Uni-Dortmund.DE>
To: linux-kernel@vger.rutgers.edu <linux-kernel@vger.rutgers.edu>
Date: Wednesday, December 30, 1998 11:21 PM
Subject: Re: Intel Makefile Suggestion

>On Wed, Dec 30, 1998 at 09:06:35AM +0100, Jakub Jelinek wrote:
>> Alternatively, do this in arch/i386/Makefile:
>>
>> IS_EGCS := $(shell if $(CC) --version 2>&1 | grep 'egcs' > /dev/null;
then echo y; else echo n; fi)
>
>This does not help for pgcc, gcc 2.8 and other variants the kernel
>might encounter.
>

Can be fixed with

HAS_586OPTION := $(shell if $(CC) --version 2>&1 | grep -q 'egcs'; then echo
y; else echo n; fi)
if $HAS_586OPTION = "n"; then
HAS_586OPTION := $(shell if $(CC) --version 2>&1 | grep -q '2.8'; then
echo y; else echo n; fi)
fi
if $HAS_586OPTION = "n"; then
HAS_586OPTION := $(shell if $(CC) --version 2>&1 | grep -q 'pgcc'; then
echo y; else echo n; fi)
fi
>> ifdef CONFIG_M586
>> ifneq ($(IS_EGCS),y)
>> CPUFLAGS := -m486
>> else
>> CPUFLAGS := -mpentium -march=pentium
>
>-mpentium is -mcpu=pentium and as such is included in -march=pentium,
>so -march=pentium would suffice. You would need to switch from -O2 to
>-O6, too (see pgcc FAQ at http://www.goof.com/pcg/)
>
>
>
>There has already been such discussion in a different thread a couple
>of weeks ago, please check it. Search for messages which contain
>
> [PATCH] Support new egcs/pgcc -mpentium(pro) options
>
>in their subject.
>
>I am currently considering a solution which comprises
>
>a) automatic configuration
> to take the load out of the configuration menues (sp?) shown to the
> user
>
>b) manual configuration
> e. g. for compiling a K5 kernel on a Pentium-II machine
>
>c) automatic compiler detection
> to prevent enabling these options with plain gcc-2.7
>
>d) other CPUs
> such as Cyrix, AMD K6
>
>
>
>--
>Matthias Andree
>
>-
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>



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