Re: alloca redefinition on freebsd

[Vincent Torri]

Hey Ralf,

> * Vincent Torri wrote on Tue, Jul 28, 2009 at 10:53:42AM CEST:
> > if one uses AC_FUNC_ALLOCA, the autoconf documentation gives the way
> > to correctly define alloca.
> >
> > On FreeBSD, alloca is already defined in stdlib.h. So if stdlib.h is
> > included before that piece of code, a warning is displayed by gcc.
> >
> > Shouldn't a guard be added in the piece of code of the docmentation
> > of AC_FUNC_ALLOCA in order to avoid that warning (like #ifndef
> > alloca etc...) ?
>
> Well, there is already a guard, but it is in text not in code:
>
>     Source files that use `alloca' should start with a piece of code
>     like the following, to declare it properly.

ok, so i should anyway always put that piece of code before any other 
standard header files

> Or do you also get an error if you move that piece of code before the
> stdlib.h include?

currently, it's just a warning, not an error.

The guy just told me that, with freebsd 7.2, putting stdlib.h after 
removes the warning. With freebsd 8 (which is not stable yet), there is 
the warning, but that OS is not released yet, so it's not very important 
for now.

thank you

Vincent Torri