Date: Fri, 22 Dec 2006 09:50:13 +0100 (CET) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-hackers@FreeBSD.ORG, youshi10@u.washington.edu Subject: Re: Properly controlling CFLAGS/CXXFLAGS Message-ID: <200612220850.kBM8oDD0037287@lurza.secnetix.de> In-Reply-To: <458A0620.5020905@u.washington.edu>
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Garrett Cooper wrote:
> I was wondering (looking at the make.conf manpage), what's the
> best way to control one's CFLAGS/CXXFLAGS. I'd prefer if only a few
> ports would have optimized compiler flags, while the rest of the system
> used a safe set of compiler flags.
The simplest way is to use conditionals in /etc/make.conf
depending on the ports directory:
.if ${.CURDIR:M*/somecategory/someport}
CFLAGS= -O3 -pipe
CFLAGS+= -DSOMETHING
.endif
> CFLAGS= -O2 -pipe
Using -O2 without -fno-strict-aliasing will break certain
programs. The default is -O2 -fno-strict-aliasing -pipe
and it is _not_ recommended to override it globally, or
otherwise you're guaranteed to shoot yourself in the foot,
sooner or later.
> COPTFLAGS= ${CFLAGS} -msse -msse2 -mfpmath=sse,387
That will break kernel compiles. Again, you should not
override COPTFLAGS, unless you know exactly what you're
doing.
Best regards
Oliver
--
Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing
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