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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . P A R A M E T E R S --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1995-2009, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the default (used on all native platforms) version of this package
+
+pragma Compiler_Unit;
+
+package body System.Parameters is
+
+ -------------------------
+ -- Adjust_Storage_Size --
+ -------------------------
+
+ function Adjust_Storage_Size (Size : Size_Type) return Size_Type is
+ begin
+ if Size = Unspecified_Size then
+ return Default_Stack_Size;
+ elsif Size < Minimum_Stack_Size then
+ return Minimum_Stack_Size;
+ else
+ return Size;
+ end if;
+ end Adjust_Storage_Size;
+
+ ------------------------
+ -- Default_Stack_Size --
+ ------------------------
+
+ function Default_Stack_Size return Size_Type is
+ Default_Stack_Size : Integer;
+ pragma Import (C, Default_Stack_Size, "__gl_default_stack_size");
+ begin
+ if Default_Stack_Size = -1 then
+ return 2 * 1024 * 1024;
+ else
+ return Size_Type (Default_Stack_Size);
+ end if;
+ end Default_Stack_Size;
+
+ ------------------------
+ -- Minimum_Stack_Size --
+ ------------------------
+
+ function Minimum_Stack_Size return Size_Type is
+ begin
+ -- 12K is required for stack-checking to work reliably on most platforms
+ -- when using the GCC scheme to propagate an exception in the ZCX case.
+ -- 16K is the value of PTHREAD_STACK_MIN under Linux, so is a reasonable
+ -- default.
+
+ return 16 * 1024;
+ end Minimum_Stack_Size;
+
+end System.Parameters;