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From: "Reko Turja" <reko.turja@liukuma.net>
To: "Luca Presotto" <Luca.Presotto@cern.ch>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Tuning make.conf
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> Should my make.conf be  like:
> MAKEOPTS==-j3
> CPUTYPE=core2
> CFLAGS= --O2 -pipe -fno-strict-aliasing
>
> or just:
> MAKEOPTS==-j3
> CPUTYPE=core2
>
> or maybe:
>
> MAKEOPTS==-j3
> CPUTYPE=core2
> CFLAGS+= --O2 -pipe -fno-strict-aliasing

Setting CFLAGS can cause errors while compiling and other undesirable 
effects, so I recommend leaving CFLAGS undefined.
If you want to optimise things use COPTFLAGS instead.

-Reko