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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Storage_Size in a Simple Program
Date: Thu, 25 Oct 2018 16:56:45 +0100
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Date: 2018-10-25T16:56:45+01:00
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joakimds@kth.se writes:

>> That said, I would welcome a standard Ada way to specify the stack
>> size for the environment task. Perhaps Storage_Size could be
>> specified for the main subprogram, in the same way as the Priority
>> for the environment task.
>
> At
> "http://www.adaic.org/resources/add_content/standards/05aarm/html/AA-D-1.html"
> one can read: Likewise, the priority value is associated with the
> environment task if the pragma appears in the declarative_part of the
> main subprogram.
>
> Therefore, specifying Storage_Size for the main subprogram as can be
> done with Priority should be technically possible.

On the other hand, I just tried

   with Ada.Text_IO; use Ada.Text_IO;
   with Interfaces;
   procedure Main_Stack is
      Size : Natural := 16;
      type Arr is array (Natural range <>) of Interfaces.Unsigned_8;
   begin
      loop
         Put_Line ("trying size" & Size'Image);
         declare
            A : Arr (1 .. Size) := (others => 0);
         begin
            A (A'Last) := 42;
         end;
         Size := Size * 2;
      end loop;
   end Main_Stack;

on this Mac (High Sierra, 8GB RAM) and it failed at 8 Mb. (ulimit -s
says 8192k).

If I say ulimit -s 16384, it fails at 16 Mb.

Since the main program's stack limit is determined by the OS, I don't
see how an Ada aspect/pragma can affect it.