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Re: Recommended alloca declaration breaks on alloca.c

From: James Youngman
Subject: Re: Recommended alloca declaration breaks on alloca.c
Date: Sun, 10 Apr 2005 23:38:02 +0100
User-agent: Mutt/1.3.28i

On Sun, Apr 10, 2005 at 02:02:20PM +0200, Hrvoje Niksic wrote:
> It turns out that the alloca declaration that the Autoconf manual[1]
> recommends for config.h declares alloca() as returning char *, whereas
> the C implementation I use declares it as returning void *.  But
> regardless of alloca.c, another problem is that, on Linux, stdlib.h
> includes alloca.h, which also declares void *alloca().
> I fixed this problem by changing the declaration from "char
> *alloca();" to "void *alloca();".  Is there a better fix, or should
> the manual be updated for alloca to return void *?

If the GNU C library implements alloca() itself, then it should be
declared in /usr/include/alloca.h.  Otherwise, if it's implemented by
the GNU C compiler only, then I would think it should be declared in a
GCC header file (for example /usr/lib/gcc-lib/*/*/include/alloca.h).


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