Date: Thu, 22 Feb 2001 12:50:50 +0100 (CET) From: Alexander Leidinger <Alexander@Leidinger.net> To: kris@obsecurity.org Cc: arch@FreeBSD.ORG Subject: Re: cvs commit: src/share/mk sys.mk Message-ID: <200102221150.f1MBopF07996@Magelan.Leidinger.net> In-Reply-To: <20010221123835.A59024@mollari.cthul.hu>
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On 21 Feb, Kris Kennaway wrote:
> .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)
You want to use "-mXXX -march=XXX". You are CPU-specific already, no
need to produce parts of code which run on an i386 too.
---snip---
#include <stdio.h>
int main(void)
{
#if defined(__pentiumpro__) || defined(__i686__)
puts("pentiumpro");
#endif
#if defined(__pentium__) || defined(__i586__)
puts("pentium");
#endif
exit(0);
}
---snip---
---snip---
(23) netchild@ttyp0 % rm cputest; CFLAGS=-mpentiumpro gmake cputest; md5 cputest; ./cputest
cc -mpentiumpro cputest.c -o cputest
MD5 (cputest) = 577769bb73460f7bd062882a4ee44235
pentiumpro
(24) netchild@ttyp0 % rm cputest; CFLAGS=-march=pentiumpro gmake cputest; md5 cputest; ./cputest
cc -march=pentiumpro cputest.c -o cputest
MD5 (cputest) = b721209c7b0089ee1442cb0880af06b8
(25) netchild@ttyp0 % rm cputest; CFLAGS="-mpentiumpro -march=pentiumpro" gmake cputest; md5 cputest; ./cputest
cc -mpentiumpro -march=pentiumpro cputest.c -o cputest
MD5 (cputest) = c41ce5e5941b335c6fcf1b6d8d59f2e1
pentiumpro
---snip---
Bye,
Alexander.
--
"One world, one web, one program" -- Microsoft promotional ad
"Ein Volk, ein Reich, ein Fuehrer" -- Adolf Hitler
http://www.Leidinger.net Alexander @ Leidinger.net
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