Re: buildworld panic on ia64

On Jul 8, 2009, at 4:40 AM, Anton Shterenlikht wrote:

>> BTW: I never got the error when doing a buildworld. I
>> think Anton's non-standard compiler options make GCC much
>> more FP intensive and thus prone to causing the race.
>
> hey, my compiler options are just a copy from
> 	/usr/share/examples/etc/make.conf
>
> with obvious changes, e.g. CPUTYPE=itanium2
> The CFLAGS, COPTFLAGS, CXXFLAGS are as in the example make.conf.
>
> Which non-standard options did you spot?

All of them :-)

There is no /etc/make.conf by default, so the existence
of /etc/make.conf with CFLAGS, COPTFLAGS, etc makes them
non-standard.

As a special warning: /usr/share/examples/etc/make.conf
is inherently i386 biases (like most of the examples and
documentation I might add). It's unwise to copy flags
from there and expect good results. Even warnings-only
examples can cause build breakages (due to -Werror),
because compilers for different architectures emit
different warnings or emit the same warning at different
times.

By all means: experiment. But be very careful not to make
the assumption that if the code compiles, it'll also run.
The weirder the set of compiler options, the more likely
you trip over optimization bugs and end up with an unstable
system. And I'm not even talking about whether the set
of options give you more optimal code in general.

-- 
Marcel Moolenaar
xcllnt_at_mac.com