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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Elaboration in generic package
Date: Thu, 13 Apr 2017 08:19:01 +0100
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Xref: news.eternal-september.org comp.lang.ada:46583
Date: 2017-04-13T08:19:01+01:00
List-Id: <comp.lang.ada>

"Randy Brukardt" <randy@rrsoftware.com> writes:

> Since Ada elaborates items linearly, the instance elaboration of
> Mystic will call reallyComplicatedFunction before Seed is elaborated
> -- meaning the body would be depending on something
> uninitialized. That's what subprogram elaboration checks are designed
> to prevent. Ergo, there must be a check in this case (regardless of
> the actual body, of course).

I tried this simple demo

   package body Mystic is
      Max : Positive;
      function reallyComplicatedFunction(x : Positive) return Table is
         Result : Table (1 .. Positive'Min (X, Max) / 2) := (others => 1);
      begin
         return Result;
      end ReallyComplicatedFunction;
   begin
      Max := 5;
   end Mystic;

and, surprise, the value of Max used is 0; no warnings, no ABE, even
with -gnatE. Bug report forthcoming.

Thanks for the analysis.