[Ada] update stack realignment for foreign conventions

[Olivier Hainque <hainque at adacore dot com>]

Stack realignment for Ada subprograms with foreign convention
(expected on the tiny case below) stopped working on x86 so time ago.

Indeed, it still relies on the definition of
FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN and things have changed in this area.

This patch fixes this by adjusting the control macros in accordance with
the current MAIN_STACK_BOUNDARY instead.

Fixes the tescase at hand. Bootstrapped and regtestsed on x86-suse-linux.

Olivier

2010-08-30  Olivier Hainque  <hainque@adacore.com>

	* gcc-interface/decl.c (FOREIGN_FORCE_REALIGN_STACK): New macro,
	replacement for FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN.
	(gnat_to_gnu_entity) <case ..., E_Procedure>: Use it.

--

procedure P;
pragma Convention (C, P);

procedure P is
  procedure process;
  pragma import (c, process);
begin
  process;
end;

Attachment: realignstack-ada.dif
Description: Text document