Date: Wed, 21 Feb 2001 12:38:35 -0800 From: Kris Kennaway <kris@obsecurity.org> To: mi@aldan.algebra.com Cc: arch@freebsd.org Subject: Re: cvs commit: src/share/mk sys.mk Message-ID: <20010221123835.A59024@mollari.cthul.hu> In-Reply-To: <200102211827.f1LIRuv32516@misha.privatelabs.com>; from mi@aldan.algebra.com on Wed, Feb 21, 2001 at 01:27:54PM -0500 References: <Pine.BSF.4.21.0102211415050.25100-100000@besplex.bde.org> <200102211827.f1LIRuv32516@misha.privatelabs.com>
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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?
> And a comment, that changing -mcpu to -march will, probably, be even
> better, but will prevent the binaries from being usable on earlier CPUs.
Well, MACHINE_CPU is a list, not a word. And gcc doesn't support
optimizations for all of the values we will be supporting (e.g. a lot
of ports contain things like 3DNOW! asm code, etc). You could however
imagine playing games with things like:
.if ${MACHINE_CPU:Mi686}
CFLAGS += -mpentiumpro
.elif ${MACHINE_CPU:Mi586}
CFLAGS += -mpentium
...
.endif
which may be worthwhile to do.
The -march statement doesnt matter though, since some binaries built
with MACHINE_CPU set will already be CPU-specific (e.g. if you specify
i686 then openssl will use the i686 blowfish code)
Kris
P.S. Trying yet again to move this thread onto -arch where it belongs.
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