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Newsgroups: comp.lang.ada
Subject: Re: Wide Character Problem in Ada.Numerics
From: Georg Bauhaus <bauhaus@arcor.de>
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Date: Tue, 24 Apr 2007 11:16:05 +0200
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Date: 2007-04-24T11:10:38+02:00
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On Tue, 2007-04-24 at 08:59 +0200, Martin Krischik wrote:
> david.smith@gmail.com schrieb:

> > When I next compile my real code with greek letters *and* using the
> > Ada.Numerics package, I get the following error:
> > 
> > a-numeri.ads:25:04: illegal wide character
> > 
> > This is the line that has the bracket notation definition of pi in
> > it.
> > 
> > Does anyone know what is going on?  Why is there an error in a system
> > file?
> 
> Yes - I saw that to - GNAT produces this error if utf-8 (-gnatW8) is 
> used for source code. Best is to file a bug report.

Wouldn't it be best in this case to do what everyone else does
and, as an option, have the compiler determine the default character
encoding using a BOM? http://unicode.org/faq/utf_bom.html#22

   Bytes Encoding Form
   00 00 FE FF  UTF-32, big-endian
   FF FE 00 00  UTF-32, little-endian
   FE FF        UTF-16, big-endian
   FF FE        UTF-16, little-endian
   EF BB BF     UTF-8

If there is no BOM, there is ambiguity anyway for compilers
with circuits for interpreting 8 bits in many ways.