Re: alloca() problem (Re: [Mingw-users] union cast errors?)

[SONE T. <ts...@cm...>]

On Thu, Dec 14, 2000 at 04:08:11PM +0300, Phil Krylov wrote:
> SONE Takeshi wrote:
> 
> > Ok, I see the problem.
> > _alloca() *is* in libgcc.a, but it is not what MSVC people expect.
> > It's a support function of gcc, not a 'non-oldname version' of alloca().
> > _alloca() is called implicitly whenever gcc allocates >4096 bytes in stack.
> 
> Ok, I see. But is there any way to use the documented alloca() function? What
> libraries should I link against? Maybe I can specify an additional option to
> gcc? Currently, when I call alloca(), it returns a pointer to some code instead
> of allocated space; it uses __alloca symbol from libgcc.a.

Most likely you have a line like '#define alloca _alloca' somewhere?
If so delete it.
If your source uses '_alloca()' instead of 'alloca()', you need
the opposite definition '#define _alloca alloca'.

No library other than libgcc is needed, because alloca() is done by 
compiler itself (with help of __alloca).

'_alloca()' in C becomes assembler symbol '__alloca', which may not be
called directly.

--
Takeshi