On Wed, May 28, 2008 at 07:37:14PM -0400, Carlos O'Donell wrote:
> On Wed, May 28, 2008 at 7:00 PM, Kyle McMartin <kyle@xxxxxxxxxxx> wrote:
> > Building the kernel without optimization is very tetchy... if you can
> > guess what passes to remove, I can try... one of the optimization
> > effects that must go is DCE though, otherwise we'll have undefined
> > references to things (ie: kmalloc_too_much in a switch that should have
> > been eliminated except the constant case.)
>
> You *need* to build the kernel with -fno-dce and -fno-tree-dce?
> Are you working around another compiler bug?
>
> Take a look at the attached scripts I use.
>
> ./o2list.sh > o2list.txt
> ./permute-options.sh o2list.txt > run.sh
> chmod u+x
> run.sh
>
> Normally I can simply run the results on a target and
> know which is good and which is bad. Unfortunately
> you have to link each into a kernel and try to boot.
>
Other way around... we *need* dce (but apparnetly not on this file)
because of inline constructs like
switch (sizeof(some constant)) {
1:
blah;
default:
some_undefined_reference();
}
Ah well, anyway, it works built at -O0, and buggers up at -O1.
Want a copy of each of the .S?
--
To unsubscribe from this list: send the line "unsubscribe linux-parisc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
