Hello,
Oliver Fromme wrote:
Marc G. Fournier <[EMAIL PROTECTED]> wrote:
> What are ppl currently using for CFLAGS/COPTFLAGS in /etc/make.conf for
> building kernel/world? I know awhile back it wasn't recommended to go
> above -O2, for instance, but suspect that has changed ... ?
The best optimization is probably to not override the
defaults at all, because they're already pretty optimal.
In fact, by overriding the defaults there's a good chance
to make things worse. :-)
The default CFLAGS are "-O2 -pipe -fno-strict-aliasing".
Anything above -O2 isn't supported, and using -O2 without
-fno-strict-aliasing also isn't supported (and will create
broken code for some programs). A common mistake is to
specify CFLAGS="-O2 -pipe" and omit -fno-strict-aliasing.
That'll shot you in the foot sooner or later.
Best regards
Oliver
May be default flags have to be set here:
/usr/src/share/examples/etc/make.conf ?
I'm asking because in this file I read:
# CFLAGS controls the compiler settings used when compiling C code.
# Note that optimization settings other than -O and -O2 are not recommended
# or supported for compiling the world or the kernel - please revert any
# nonstandard optimization settings to "-O" or -O2 before submitting bug
# reports without patches to the developers.
#
#CFLAGS= -O -pipe
May be "-fno-strict-aliasing" have to be added here then ?
--
Best Wishes,
Stefan Lambrev
ICQ# 24134177
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