On Sat, 15 Jun 2002, Terry Lambert wrote:

> Maxime Henrion wrote:
> > Terry Lambert wrote:
> > > What exactly does this do, besides implying "-fno-builtin"?
> > >
> > > The documentation says "and implies main has no special requirements"...
> > >
> > > Neither the kernel nor modules have a "main", so the only thing that's
> > > relevent here is the "-fno-builtin", right?
> >
> > IIRC, -ffreestanding prevented GCC3 from being stupid optimizations like
                                                   ^^^^^^ smart
> > changing occurences of printf("constant string\n") to puts("constant
> > string"), which failed for kernel builds since we don't have puts() in
> > the kernel...
> That is an incredibly *fugly* "optimization".  It assumes that I
> use libc, unless I have "-ffreestanding", and it assumes my
> implementation of printf vs. puts.

This is a routine optimization.  It assumes that you use a C compiler
(printf and even libc might not exist, since they might be builtins).
A non-routine optimization might involve building hardware to run the
application and emitting the 1 bit instruction to turn the hardware on.


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