At 04:45 AM 2/14/2006, Oliver Fromme wrote:
Vinny Abello <[EMAIL PROTECTED]> wrote:
> CPUTYPE=pentium4
Better use "?=".
Yes, I saw that error and corrected it. Thanks. That wasn't the
source of my problems actually, but I at least have it specified properly now.
> CFLAGS= -O2 -pipe
> COPTFLAGS= -O -pipe
I recommend not to overide those two at all. Especially
your CFLAGS setting might generate broken code because
there are sources which are not aliasing-clean, which can
break with any optimizations beyond -O, unless you also
specify -fno-strict-aliasing.
Really? Are there any current examples of such? I've never run into
this myself, but I'm sure you wouldn't be recommending it if it wasn't true.
What about -funroll-loops and -ffast-math? I see a lot of people
using those options in general as well.
I actually found one reference from someone claiming -O3 is good in
CFLAGS and -O2 for COPTFLAGS although I have read a lot of things
about why not to use -O3 in CFLAGS and that it's not supported at all
with buildworld, so I'm not really interested in using that at all,
even with ports.
The defaults are "-O2 -fno-strict-aliasing -pipe" for
CFLAGS, and for COPTFLAGS it's "-O -pipe" if DEBUG is
defined (the default in GENERIC), otherwise "-O2 -pipe
-fno-strict-aliasing".
Is -O2 safe on COPTFLAGS if you have debugging disabled in the
KERNCONF? I usually disable it as I have no interest in debugging the
kernel (nor have I had problems where I've needed to... yet). I've
found references in the archives that it is desirable to get (keep?)
the kernel working with -O2 optimizations.
Any pointers appreciated. TIA!
Vinny Abello
Network Engineer
Server Management
[EMAIL PROTECTED]
(973)300-9211 x 125
(973)940-6125 (Direct)
PGP Key Fingerprint: 3BC5 9A48 FC78 03D3 82E0 E935 5325 FBCB 0100 977A
Tellurian Networks - The Ultimate Internet Connection
http://www.tellurian.com (888)TELLURIAN
"Courage is resistance to fear, mastery of fear - not absence of
fear" -- Mark Twain
_______________________________________________
[email protected] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
