Richard Guenther wrote:
But it's also not inconceivable that gcc adds a -fkernel-inlining or
similar that changes the parameters if we ask nicely. I suppose
actually such a parameter would be useful for far more programs
than the kernel.
I think that the kernel is a perfect target to optimize default -Os behavior for
(whereas template heavy C++ programs are a target to optimize -O2 for).
And I think we did a good job in listening to kernel developers if once in
time they tried to talk to us - GCC 4.3 should be good in compiling the
kernel with default -Os settings. We, unfortunately, cannot retroactively
fix old versions that kernel developers happen to like and still use.
Unfortunately I think there have been a lot of "we can't talk to them"
on both sides of the kernel-gcc interface, which is incredibly
unfortunate. I personally try to at least observe gcc development,
including monitoring #gcc and knowing enough about gcc internals to
write a (crappy) port, but I can hardly call myself a gcc expert.
Still, I am willing to spend some significant time interfacing with
anyone in the gcc community willing to spend the effort. I think we can
do good stuff.
-hpa
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