Re: [Ada] Standard.Interger'Size = 32?

[Laurent GUERBY <laurent at guerby dot net>]

On Sun, 2005-03-06 at 04:12 -0800, Bernd Trog wrote:
> On Thu, 3 Mar 2005, Robert Dewar wrote:
> 
> > Bernd Trog wrote:
> > > according to the gnat ref. manual
> > >
> http://gcc.gnu.org/onlinedocs/gnat_rm/Implementation-Defined-Characteristics.html
> > > 
> > > Standard.Interger'Size is 32 bit for the compilation target.
> > >
> > > I'd like to know if the Ada frontend (not the runtime
> > > system) depends on this (target) setting in any way? 
> > 
> > Yes, the front end uses Ada strings which are indexed by Integer.
> > Integer cannot be 16 bits. The Ada RM does allow this, but I am  
> > pretty sure GNAT counts on integer being 32 bits.
> 
> OK. So the user should be warned (by documentation and the compiler) 
> when he tries to use the Ada frontent with backend that can set 
> INT_TYPE_SIZE to 16, right?

Getting GNAT to be hosted on a 16 bit machine is probably not
workable. On the other side, targetting a 16 bit machine from a >= 32
bit host should be doable for Ada.

> A 'grep INT_TYPE_SIZE' lists avr, h8300, ip2k, m68hc11, m68k,
> pdp11 and stormy16 as possible candidates for such a warning.

I believe Stéphane Carrez was able to run some Ada on a m68hc11,
see http://gel.sourceforge.net/ada_example.php

Laurent