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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: What is the warning about builtin-function on gcc-4.6.0 ?
Date: Sun, 27 Mar 2011 13:14:40 -0400
Organization: The World Public Access UNIX, Brookline, MA
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Florian Weimer <fw@deneb.enyo.de> writes:

> * Robert A. Duff:
>
>> Florian Weimer <fw@deneb.enyo.de> writes:
>>
>>> This is at odds with the existing Ada literature, and existing ACATS
>>> tests (C45632A, for example).
>>
>> Hmm, I got curious, and looked at C45632A.  It looks wrong, to me.
>> "EQUAL (ABS I, I)" should return False, or else raise C_E.
>> The test requires it to return True, or raise C_E.
>> Maybe they meant "EQUAL (ABS I, - I)".
>
> I think the equality test is just there to provide a better failure
> message.  With wrap-around semantics, both abs I = I and abs I = -I
> are true.  

But "EQUAL (ABS I, I)" can return False.  The test calls FAILED
(twice) if it does, so the test is wrong.

>...There's still a call to Failed further down, so this
> doesn't affect the correctness of the test.

Ah, I missed that.  But I still think the test is wrong.

I'm not surprised nobody noticed -- I think most compilers will raise C_E.

- Bob