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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: GNAT and no runtime
Date: 09 Jun 2004 06:07:21 +0100
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Date: 2004-06-09T06:07:21+01:00
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Martin Krischik <krischik@users.sourceforge.net> writes:

> There seems to be some algorithm. I recently tried to build some
> extension to the Ada.* tree for Wide_Characters. GNAT was then
> telling me exactly which filename to use for what package.

I had a quick scan of the gnat UG
  http://gcc.gnu.org/onlinedocs/gnat_ugn_unw/
but no luck (there may be info hidden in there ..)

gnatkr will tell you the file name GNAT expects for Ada.*, GNAt.*,
System.*:

   smaug.pushface.org[5]$ gnatkr ada.calendar
   a-calend

> In the end the hole thing failed. After compiling everything OK,
> GNAT moaned about my packages not been part of the predefined
> Library.

There are rules for packages that are amended parts of the library:
you need to compile with at least -gnatg, all warnings are treated as
errors .. but I would still have expected it to build. I've never
tried any _new_ units, though.