Re: (printf) ("hello world\n");

[Segher Boessenkool <segher at kernel dot crashing dot org>]

On 10-dec-03, at 14:36, Joseph S. Myers wrote:
> On Wed, 10 Dec 2003, Segher Boessenkool wrote:
> > On 10-dec-03, at 13:27, Robert Dewar wrote:
> > > Is it really true that the name printf is reserved? Is a C program 
> > > not
> > > allowed to define its own printf function (which might or might not 
> > > be
> > > varargs)? What's the story here?
> >
> > It is reserved only in translation units that have stdio.h #include'd.
>
> It is reserved (in a hosted environment) as an identifier with external
> linkage regardless of what headers are included (7.1.3#1).

That does not prevent you from declaring and defining your own
printf() function (with a different prototype) though; it only requires
that you make that function have external linkage.


Segher