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Date:	Thu, 2 Jul 1998 19:10:55 +0200 (CEST)
From:	Linux mailing list user <linux AT windows95 DOT sucks DOT eu DOT org>
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To:	Neal Jacob Burns <nburns+@andrew.cmu.edu>
cc:	beastium-list AT Desk DOT nl
Subject:	Re: pgcc optimizes by default?
In-Reply-To:	<opavLFy00YUo1P70U0@andrew.cmu.edu>
Message-ID:	<Pine.LNX.3.96.980702190935.6497A-100000@k6.bero>
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Sender:	Marc Lehmann <pcg AT goof DOT com>
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On Thu, 2 Jul 1998, Neal Jacob Burns wrote:

> Does pgcc require any special command-line options to pentium optimize,
> (e.g. -mpentium)?

Yes. Use -mpentium -march=pentium. (The latter says that the compiler may
use pentium-specific asm instructions.)

> More specifically, will pgcc optimize for pentium if
> it is invoked with:
> gcc -O2 -c whatever.c
> (which is roughly how most Makefile's invoke it by default)?

You can change the "default" behavior by setting environment variables
(preferably in the /etc/profile):

export CFLAGS="-mpentium -march=pentium -O2 -whateverelseyouwant"
export CXXFLAGS=$CFLAGS

LLaP
bero

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