On Thu, Sep 07, 2006 at 02:47:42AM +0200, Roman Zippel wrote:
> Hi,
>
> On Thu, 7 Sep 2006, Adrian Bunk wrote:
>
> > > BS, even without it gcc can't make such assumption.
> > > There is not a single optimization, which would be invalid in a kernel
> > > environment and would be "fixed" by this option, so please stop this
> > > nonsense.
> >
> > You are wrong.
> >
> > Section 5.1.2.2.2 of ISO/IEC 9899:1999 says:
> > In a hosted environment, a program may use all functions, macros, type
> > definitions, and objects described in the library clause (clause 7).
> >
> > Since a hosted environment means gcc+libc, it's therefore clear that gcc
> > can assume the presence of a full libc if gcc isn't told that it's used
> > as a freestanding environment.
>
> Define "full libc".
Everything described in clause 7 of ISO/IEC 9899:1999.
> Explain what exactly -ffreestanding fixes, which is not valid for the
> kernel.
It's simply correct since the kernel doesn't provide everything
described in clause 7 of ISO/IEC 9899:1999.
And it fixes compile errors caused by the fact that gcc is otherwise
allowed to replace calls to any standard C function with semantically
equivalent calls to other standard C functions - in a hosted environment
the latter are guaranteed to be present.
> byem Roman
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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