Date: Thu, 22 Feb 2001 21:50:13 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: Kris Kennaway <kris@obsecurity.org> Cc: arch@FreeBSD.ORG Subject: Re: cvs commit: src/share/mk sys.mk Message-ID: <Pine.BSF.4.21.0102222136390.2544-100000@besplex.bde.org> In-Reply-To: <20010221124552.A59188@mollari.cthul.hu>
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On Wed, 21 Feb 2001, Kris Kennaway wrote:
> On Wed, Feb 21, 2001 at 11:48:05AM -0800, David O'Brien wrote:
> > On Wed, Feb 21, 2001 at 01:27:54PM -0500, mi@aldan.algebra.com wrote:
> > > BTW, may be -mcpu=${MACHINE_CPU} can be added to the default CFLAGS now?
> >
> > I am nervous about this on the Alpha unless very well tested. We all
> > know that an ev4 system as the ev4 cannot handled ev56-only instructions.
>
> This applies to the i386 as well (i386 can't handle i586 instructions)
-mcpu doesn't affect the instruction set used on i386's. It takes -march
to affect it. Similarly for many other target machines. The alpha seems
to be different here (it doesn't have -march). Our MACHINE, MACHINE_ARCH
and MACHINE_CPU are sort rotated compared with the gcc -march and -mcpu:
MACHINE is similar to -march
MACHINE_ARCH is similar to -mcpu
MACHINE_CPU is more specialized
Bruce
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