This MAY be of some use:

http://www.greenend.org.uk/rjk/2003/03/inline.html

<http://www.greenend.org.uk/rjk/2003/03/inline.html>&
http://www.gnu.org/software/hello/manual/autoconf/Function-Portability.html

<http://www.gnu.org/software/hello/manual/autoconf/Function-Portability.htm=
l>

On 13 August 2010 00:18, Carl Denk <cdenk@windstream.net> wrote:

> Can someone suggest a book or online reference I could print out that get=
s
> into the details of C99 (that's the version that microchip is based on
> ??) that this thread
> and things like "ifndef" are covered. Microchip seems to leave out some
> standard stuff, or I just haven't found where it's hiding.
>
> On 8/11/2010 11:13 PM, Daniel Serpell wrote:
> > Hi,
> >
> > On Wed, Aug 11, 2010 at 5:54 PM, peter green<plugwash@p10link.net>
>  wrote:
> >
> >> Wouter van Ooijen wrote:
> >>
> >>>   >  Afaict C varargs require the caller to do the removal
> >>>
> >>>
> >>>> because only the caller knows for sure how many parameters have been
> >>>> passed and due to the retarted way C handles prototypes you can't ha=
ve
> a
> >>>> different interface for varargs and non-varargs functions.
> >>>>
> >>>>
> >>> Maybe in super-ancient C, but with function prototypes...
> >>>
> >>>
> >> But when the compiler builds the function it doesn't know whether the
> >> caller will be using function prototypes or not.
> >>
> > The C99 standard explicitly requires that you have the prototype in the
> > varargs case, see 6.5.2.2 paragraph 6:
> >
> >   If the expression that denotes the called function has a type that do=
es
> >   not include a prototype, the integer promotions are performed on each
> >   argument, and arguments that have type float are promoted to double.
> >   These are called the default argument promotions. If the number of
> >   arguments does not agree with the number of parameters, the behavior =
is
> >   undefined. If the function is defined with a type that includes a
> >   prototype, and either the prototype ends with an ellipsis (, ...) or
> the
> >   types of the arguments after promotion are not compatible with the
> types
> >   of the parameters, the behavior is undefined.
> >
> > So, if you try to call a vararg function without providing the prototyp=
e,
> > the result is undefined because you cannot define a vararg function
> > without using a prototype, see 6.9.1 p8.
> >
> >      Daniel.
> >
> >
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