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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.java.advocacy,comp.object,comp.lang.ada,misc.misc
Subject: Re: the Ada mandate,
 and why it collapsed and died (was): 64 bit   addressing and OOP
Date: 23 Apr 2003 19:31:08 +0100
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Date: 2003-04-23T19:31:08+01:00
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softeng3456@netscape.net (soft-eng) writes:

> Richard Riehle <richard@adaworks.com> wrote in message news:<3EA62B54.49580F4F@adaworks.com>...
> 
> > drive the move to interfacing with C.   Also, Ada was,
> > and is, designed to permit a programmer to get to a very
> > low-level of programming, even to the machine code
> > level, if it seems appropriate.
> 
> How many times in your whole life have you done this?
> Or known of other people who have done this?
> 
> And how many instances do you know when this
> was done by interfacing with C?

The problem was to interface to the PPC timebase register (the mftb
instruction) which is not supported in C either. So the choice, learn
the asm features of GNAT vs learn the asm features of GCC (which are
of course very similar) seemed a no-brainer; we did the GNAT version.

Later I tried the GCC version (this was on VxWorks) and took a couple
of hours to realise that in that environment you need to say __asm,
because WindRiver use -ansi in C compilations.

Whereas the GNAT version worked first time (it took rather longer to
get the 64-bit version working, though).