Date: 26 Jul 2000 03:10:05 +0200 From: Cyrille Lefevre <clefevre@citeweb.net> To: "Jeffrey J. Mountin" <jeff-ml@mountin.net> Cc: Otter <otterr@telocity.com>, Dave Boers <djb@ifa.au.dk>, stable@FreeBSD.ORG Subject: Re: Recommended compilation optimizations Message-ID: <aef5elxu.fsf@gits.dyndns.org> In-Reply-To: "Jeffrey J. Mountin"'s message of "Tue, 25 Jul 2000 16:38:01 -0500" References: <20000724152021.A61713@relativity.student.utwente.nl> <4.3.2.20000725153431.00d66d60@207.227.119.2>
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"Jeffrey J. Mountin" <jeff-ml@mountin.net> writes:
> Throwing flags for fun isn't advised and in most cases the improvements are minimal. After reading the man pages, etc,
> some make sense to have (ie -march and -cpu). However, don't recall ever seeing any performance data. OTOH, there can
> be significant changes. Then one must decide if the program is used enough to justify the risk. Talking system here,
> not ports, which do their own thing in most cases, unless you have CFLAGS set. Most ports will take a -O2, but then you
> need to change it back before doing the world.
>
> Frankly I got tired of switching (and forgetting to) and just stick with '-O -pipe' and hack the ports as
> needed/desired. As mentioned it is also faster building world. AFAICR, about 15% faster using '-O -pipe' than '-O2
> -pipe'.
in /etc/make.conf, try something like that :
IS_SYS?= ${.CURDIR:M*/sys*}
IS_SRC?= ${.CURDIR:M*/src*}
IS_PORTS?= ${.CURDIR:M*/ports*}
.if !empty(IS_SYS)
CFLAGS= -O -pipe
.endif
.if !empty(IS_SRC)
CFLAGS= whatever you want
.endif
.if !empty(IS_PORTS)
CFLAGS= -O2 -pipe
.endif
you see the idea ? I use rules likes them for month w/ any problems.
Cyrille.
--
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