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From: REH <spamjunk@stny.rr.com>
Newsgroups: comp.lang.ada
Subject: Re: Compiler Bug
Date: Tue, 4 Dec 2007 14:32:10 -0800 (PST)
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Date: 2007-12-04T14:32:10-08:00
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On Dec 4, 5:25 pm, Lucretia <lucret...@lycos.co.uk> wrote:
> On Dec 4, 9:58 pm, REH <spamj...@stny.rr.com> wrote:
>
> > I have an issue that my compiler vendor is trying to tell me is not a
> > bug.  I have two functions.  They both have a local variable of the
> > same name.  One calls the other (which is inlined).  The compiler
> > treats the variable in the caller as if it is of the same type as the
> > one in the callee.  Because of this, we get a constraint_error
> > exception.  The problem goes away when the pragma inline is removed.
> > The vendor is trying to tell me that this behavior is acceptable and
> > correct.  I do not believe that it is.  Please tell me who it right.
>
> > REH
>
> Which compiler? Have you tried it in GNAT?
>
> Can you post the code?
>
> Thanks,
> Luke.

No, I can't, sorry.  But the gist of it is:

function F1 return T1;
pragma Inline(F1);

function F1 return T1 is
  R : T1;
begin
  -- do stuff
  return R;
end F1;

function F2 return T2 is
  V : T1 := F1;
  R : T2;
begin
  -- do stuff
  return R;
end F2;

The compiler and debugger treat the R in F2 as if it is of type T1,
not T2.  Exceeding the bounds of T1 cause F2 to raise a
constraint_error.  The problem goes away if the pragma inline is
removed.

Thanks,
REH