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From: Stephen Leake <stephen_leake@stephe-leake.org>
Newsgroups: comp.lang.ada
Subject: Re: Ada and Unicode
Date: Mon, 19 Apr 2021 02:08:35 -0700
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DrPi <314@drpi.fr> writes:

> Any way to use source code encoded in UTF-8 ?

      for Switches ("non_ascii.ads") use ("-gnatiw", "-gnatW8");

from the gnat user guide, 4.3.1 Alphabetical List of All Switches:

`-gnati`c''
     Identifier character set (`c' = 1/2/3/4/8/9/p/f/n/w).  For details
     of the possible selections for `c', see *note Character Set
     Control: 4e.

This applies to identifiers in the source code

`-gnatW`e''
     Wide character encoding method (`e'=n/h/u/s/e/8).

This applies to string and character literals.

> What's the way to manage Unicode correctly ?

There are two issues: Unicode in source code, that the compiler must
understand, and Unicode in strings, that your program must understand.

(I've never written a program that dealt with utf strings other than
file names).
 
-gnati8 tells the compiler that the source code uses utf-8 encoding.

-gnatW8 tells the compiler that string literals use utf-8 encoding.

package Ada.Strings.UTF_Encoding provides some facilities for dealing
with utf. It does _not_ provide walking a string by code point, which
would seem necessary.

We could be more helpful if you show what you are trying to do, you've
tried, and what errors you got.

-- 
-- Stephe