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From: dewar@gnat.com
Subject: Re: Multiple pragma Imports
Date: 1998/12/28
Message-ID: <767249$nbb$1@nnrp1.dejanews.com>#1/1
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References: <762u9n$kfn$1@nnrp1.dejanews.com> <F4LKJL.7z@jvdsys.stuyts.nl>
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X-Article-Creation-Date: Mon Dec 28 04:40:41 1998 GMT
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Date: 1998-12-28T00:00:00+00:00
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In article <F4LKJL.7z@jvdsys.stuyts.nl>,
  jerry@jvdsys.stuyts.nl (Jerry van Dijk) wrote:
> a) GNAT follows the RM;
> b) GNAT issuing an error if an interfacing pragma matches
     more than one subprogram signature;

That seems a bit confused, we can't issue an error message
for this, since it is perfectly normal. It is not even
right to issue a warning, since it is quite common to use
the same Import for a function and procedure, and perfectly
legitimate (one might almost say a standard idiom for C!)

> c) GNAT having a switch to revert to its old behaviour to
     enable use of current bindings, to be phased out at
     some later date;

Since what GNAT was doing is clearly wrong, this seems a
bad idea. It is either trivial to fix the binding, or not
quite trivial (use renamings), but in the latter case, GNAT
was certainly NOT doing what the programmer intended, so it
is far better to give an error.

I don't think there is any language issue here.
Considerations of upwards compatibility make it impractical
to fix this problem even if you regard it as a problem.

Robert Dewar
Ada Core Technologies

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