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From: Florian Weimer <fw@deneb.enyo.de>
Newsgroups: comp.lang.ada
Subject: Re: Can anyone help with GNAT.Perfect_Hash_Generators ? (Possible
 memory corruption)
Date: Thu, 08 Sep 2016 21:19:59 +0200
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* Florian Weimer:

> * Natasha Kerensikova:
>
>> So at this my conclusion is that GNAT.Perfect_Hash_Generators somehow
>> works fine with 1-based string, but has trouble dealing with strings
>> with larger indices.
>
> Yes, that's reasonable to assume.  It's a relatively common source of
> bugs in Ada library code.

I have filed <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77535>
and am testing a patch.