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From: Stefan Bellon <bellon@bauhaus-tec.com>
Newsgroups: comp.lang.ada
Subject: Re: How to detect OS type and version?
Date: Thu, 13 Oct 2005 20:37:28 +0200
Organization: Bauhaus Software Technologies
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 Oct 2005 18:37:28 GMT)
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Date: 2005-10-13T18:37:28+00:00
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Jeffrey R. Carter wrote:

> Stefan Bellon wrote:
>=20
> > What we are doing is this: We configure our project for the target
> > operating system and during that configuration, a small file with
> > content similar to the following is generated:
> >=20
> > separate (Bauhaus.OS)
> > function Get_OS return String is
> > begin
> >    return "GNU/Linux";
> > end Get_OS;
>=20
> Is there some reason you're using String rather than an enumerated
> type?

Nothing more than historical reasons. In some files where OS specific
code resides, we have something like the following on package level:

   Is_MSWindows : constant Boolean :=3D Get_OS =3D "Windows";

We hope that GNAT can optimize enough to propagate the Boolean constant
and only include the active configuration in a case like

   if Is_MSWindows then
      Do_It_The_MSWindows_Way;
   else
      Do_It_The_UNIX_Way;
   end if;

But yes, making it an enumeration is a neater solution (done now).

--=20
Dipl.-Inf. Stefan Bellon
Bauhaus Software Technologies | TTI GmbH TGZ Softwareanalysen c/o ISTE
Tel.: +49 711 78 16 221       | Universit=E4tsstra=DFe 38
Fax.: +49 711 78 16 380       | 70569 Stuttgart