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From: Martin Krischik <krischik@users.sourceforge.net>
Newsgroups: comp.lang.ada
Subject: Re: different compilers: different standard types?????
Date: Wed, 17 Mar 2004 18:10:20 +0100
Organization: AdaCL
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Date: 2004-03-17T18:10:20+01:00
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Riccardo wrote:

> Hello everybody!
> 
> I've got a problem.
> Using an old program that now my Firm wants to make running on different
> kind of consoles simoultaneously I see that my compilers (I have two of
> them) are different ones depending on the fact that the word lenght is
> different (32 vs 64 bit).
> 
> Specifically:  I noticed that the type long_long_integer, that is used on
> the first one, is not present at all on the second one.

Well define your own types. 

> I'm looking for a solution that should permit me to compile the software
> on both the environments making, obviously, the least changes on the
> current version.
> 
> The same product, in the end, should be compiled on both the consoles
> without making changes! (it is possible!?!??!!??!)

If both compilers support the same types: yes.

> Is there someone who has any kind of easy solution for that problem??

I take it you are pretty new to Ada - otherwise you would know the solution.

In Ada you can define your own integer types. i.E.:

type Month is range 1 .. 31;

The compiler will choose the bits needed which is good for most programms.
If you need a special size you can say:

for Month'Size use 8; -- bit!

or even

for Month'Size use 5;

Performace for a 5 bit type will be abysmal but if you want it the compiler
will give it to you.

If you need long_long_integer and the compiler does not provide one use:

type long_long_integer is range -2**63 .. +2**63 - 1;
for long_long_integer'Size use 64;

With Regards

Martin

-- 
mailto://krischik@users.sourceforge.net
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