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Re: alloca redefinition on freebsd

From: Ralf Wildenhues
Subject: Re: alloca redefinition on freebsd
Date: Tue, 28 Jul 2009 20:59:31 +0200
User-agent: Mutt/1.5.20 (2009-06-15)

Hello Vincent,

* 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.

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


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