On Thu, Sep 07, 2006 at 03:23:31AM +0200, Roman Zippel wrote:
> Hi,
>
> On Thu, 7 Sep 2006, Adrian Bunk wrote:
>
> > > Define "full libc".
> >
> > Everything described in clause 7 of ISO/IEC 9899:1999.
>
> Its behaviour is also defined by the environment, so what gcc can assume
> is rather limited and you have not shown a single example, that any such
> assumption would be invalid for the kernel.
ISO/IEC 9899:1999 clause 7 defines the libc part of a hosted environment.
> > > 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.
>
> The kernel uses standard C, so your point is?
A standard C freestanding environment or a standard C hosted environment?
> You already got two NACKs from arch maintainers, why the hell are you
> still pushing this patch? The builtin functions are useful and you want to
The same people who justified removing -ffreestanding with the "it was
only added for x86-64, so dropping it should be safe" that has proven
wrong now put their arch maintainers hats on for NACKing reverting this
patch...
> force arch maintainers to have to enable every single one manually and
> to maintain a list of these functions over multiple versions of gcc?
It could be done per architecture or globally for some functions.
And it doesn't sound like a bad idea to check the current code and think
of what it does and what it should do - many architecture specific
things (like much of include/asm-i386/string.h) seem to be more
historically than architecture specific.
> bye, 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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