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From: Lutz Donnerhacke <lutz@iks-jena.de>
Newsgroups: comp.lang.ada
Subject: Re: Errornous String instantiation
Date: Mon, 21 Jul 2003 12:55:17 +0000 (UTC)
Organization: IKS GmbH Jena
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* Lutz Donnerhacke wrote:
> * Preben Randhol wrote:
>> Do you have a sample program so I can just gnatchop and run gnatmake I
>> can test it for you one gcc 3.3 if you like.
> 
> [private test under way, expect reports soon]

gcc 3.3  -O0:
  Start Elaborating 
  Testing Len 1 20 
  Testing Len 2 4 
  Testing Len 3 20 
  Testing Len 4 25 
  Testing Len 5 20 
  Testing Len 6 80 
  Testing Len 7 1   <-- Wrong: "k7 : String renames k6;"
  Testing Len 1 20 
  Testing Len 2 112 <-- Modified bounds as described in the top posting 
  Testing Len 3 20 
  Testing Len 4 25 
  Testing Len 5 20 
  Testing Len 6 80 
  Testing Len 7 1   <-- Wrong: "k7 : String renames k6;"

gcc 3.3  -O2:
  Start Elaborating   
  Testing Len 1 20   
  Testing Len 2 0   <-- Modified bounds before first access
  Testing Len 3 20   
  Testing Len 4 25   
  Testing Len 5 20   
  Testing Len 6 80   
  Testing Len 7 1   <--
  Testing Len 1 20   
  Testing Len 2 0   <--
  Testing Len 3 20   
  Testing Len 4 25   
  Testing Len 5 20   
  Testing Len 6 80   
  Testing Len 7 1   <--

Gnat 3.14p -O0 and -O2:
  Testing Len 1 20   
  Testing Len 2 4   
  Testing Len 3 20   
  Testing Len 4 25   
  Testing Len 5 20   
  Testing Len 6 80   
  Testing Len 7 1   <-- Wrong: "k7 : String renames k6;"
  Testing Len 1 20   
  Testing Len 2 4   
  Testing Len 3 20   
  Testing Len 4 25   
  Testing Len 5 20   
  Testing Len 6 80   
  Testing Len 7 1   
  
Otherwise, it looks stable (besides it fails the regression tests).
Those tests are successful, when run after elaboration.


In order to ease debugging, I provide a snapshot of the program at:
  ftp://ftp.iks-jena.de/pub/mitarb/lutz/ada/compilerbug.tgz