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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: How to exit a loop with keyboard input
Date: Mon, 12 Apr 2010 21:04:56 +0100
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Tero Koskinen <tero.koskinen@iki.fi> writes:

> On Mon, 12 Apr 2010 03:36:42 -0700 (PDT) Jerry wrote:
>
>> Thanks, Georg and Manuel, for testing. I'm on OS X 10.5.8 and:
>
> Most likely Get_Immediate is not implemented for OS X and
> the code is defaulting to blocking behaviour.
>
> Look at getc_immediate_common in sysdep.c.
>
> I have there (gcc 4.3.4) following #ifdef jungle:
> ...
> {
> #if defined (linux) || defined (sun) || defined (sgi) || defined (__EMX__) \
>     || (defined (__osf__) && ! defined (__alpha_vxworks)) \
>     || defined (__CYGWIN32__) || defined (__MACHTEN__) || defined (__hpux__) \
>     || defined (_AIX) || (defined (__svr4__) && defined (i386)) \
>     || defined (__Lynx__) || defined (__FreeBSD__) || defined (__OpenBSD__)
> ...
>
> __MACHTEN__ might be related to OS X, but I don't have a Mac around, so
> I am just guessing.

The current source (r156233) says

{
#if defined (linux) || defined (sun) || defined (sgi) || defined (__EMX__) \
    || (defined (__osf__) && ! defined (__alpha_vxworks)) \
    || defined (__CYGWIN32__) || defined (__MACHTEN__) || defined (__hpux__) \
    || defined (_AIX) || (defined (__svr4__) && defined (i386)) \
    || defined (__Lynx__) || defined (__FreeBSD__) || defined (__OpenBSD__) \
    || defined (__GLIBC__) || defined (__APPLE__)

and it's the __APPLE__ that does the trick. This was fixed 2009-04-15
(r146098) and is OK in GNAT GPL 2009 and, of course, in GCC 4.5.0 (still
only 'experimental').