Re: Linux kernel support -O0 optimization flag?

Pavel Machek
2013-04-24T08:29:42Z

On Mon 2013-04-15 13:16:36, richard -rw- weinberger wrote:
> On Mon, Apr 15, 2013 at 9:58 AM, Ley Foon Tan <lftan@altera.com> wrote:
> >
> >
> > Change KBUILD_CFLAGS to -O0 in Makefile and got the compilation error as
> > below.
> > Is the Linux kernel support -O0 optimization flag?
>
> No. If I'm not mistaken we need this to make sure that the compiler
> inlines some functions.
>
> In your case the compiler failed to compute the BUILD_BUG() macro correctly.
> It depends also on optimization.

Actually... You probably could replace BUILD_BUG() with nop. Bugs are
not expected to happen, right? you'll probably hit something else...

Pavel
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