On Sat, Jun 14, 2008 at 08:43:23AM +0100, David Woodhouse wrote:
> On Fri, 2008-06-13 at 22:52 +0100, Oleg Verych wrote:
> > Using same `gcc -E` principle, I once had a dream to create
> > build with something like "whole-kernel-at-time" optimising
> > compiler option:
>
> Doing it for the whole kernel probably doesn't buy you a whole lot more
> than doing it a bit more selectively, which is what I was doing in
> http://lkml.org/lkml/2006/8/24/212
For the interesting CONFIG_MODULES=n case it most likely can give you
much smaller code.
But Denys had section garbage collection patches, and combining the
per-module compilation with section garbage collection might get near
at the results of compiling the whole kernel at once?
> I think Segher has been playing with it a bit recently, and confirms my
> suspicion that combining kernel/ with arch/$ARCH/kernel, and mm/ with
> arch/$ARCH/mm, is also a big win.
>...
The big problem I see here is that we lose the link order.
Not unfixable, but quite nasty to sort out.
> dwmw2
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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