Properly controlling CFLAGS/CXXFLAGS

[Garrett Cooper]

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Hello,
	Coming from Gentoo we were taught how to 'rice' our machines.
Based on my experience though with FreeBSD, this is an improper
methodology for one to use.
	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.
	So, I was wondering what the best course of action for setting
variables in /etc/make.conf would be? Is this proper given what I'm
trying to accomplish:

/etc/make.conf snippet:

CFLAGS= -O2 -pipe
CXXFLAGS= ${CFLAGS}
COPTFLAGS= ${CFLAGS} -msse -msse2 -mfpmath=sse,387

NO_CPU_CFLAGS="YES"
NO_CPU_COPTFLAGS="YES"

CPUTYPE?=pentium4

TIA!
- -Garrett
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