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
