On Thu, Dec 29, 2005 at 08:41:07AM +0100, Ingo Molnar wrote:
>
> * Krzysztof Halasa <[email protected]> wrote:
>
> > Ingo Molnar <[email protected]> writes:
> >
> > >> gcc version 4.0.2 20051109 (Red Hat 4.0.2-6)
> >
> > > another thing: i wanted to decrease the size of -Os
> > > (CONFIG_CC_OPTIMIZE_FOR_SIZE) kernels, which e.g. Fedora uses too (to
> > > keep the icache footprint down).
> >
> > Remember the above gcc miscompiles the x86-32 kernel with -Os:
> >
> > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=173764
>
> i'm not sure what the point is. There was no sudden rush of -Os related
> bugs when Fedora switched to it for the kernel, and the 35% code-size
> savings were certainly worth it in terms of icache footprint. Yes, -Os
> is a major change for how the compiler works, and the kernel is a major
> piece of software.
The bug referenced is also fixed in gcc 4.1
Dave
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