[PATCH] Fix Ada bootstrap failure

[Richard Guenther]

On Fri, Sep 2, 2011 at 6:55 PM, Eric Botcazou <ebotcazou@adacore.com> wrote:
>> And this is the real fix.  Richard, do you want me to apply (part of it)?

A varaint of the patch is ok,

> In fact I'd even propose to revert the fold_builtin_alloca_for_var part of
> your patch and apply mine entirely, as eliminating alloca (0) early looks a
> interesting simplification.  What do you think?

I'm not sure we want to create a the replacement decl with DECL_SIZE zero
though, so I suppose instead of making sure align is BITS_PER_UNIT shouldn't
we make sure that size is at least 1?  I fear we might run into other odd
problems with zero-size autos.

Thus, a variant of the patch that re-enables handling of size zero allocas
but adjusts the size to be at least 1 is ok.

Other opinions?

Thanks,
Richard.

> --
> Eric Botcazou
>