ACE/TAO under Cygwin (was: ORB)

["Dawson, David W" <david dot w dot dawson at lmco dot com>]

I have been moderately successful in compiling ACE/TAO under Cygwin (Some
problems with cone of the Services, but my CORBA programs interoperate with
our Solaris-based TAO services (and other CORBA clients/servants) fine.

I encountered two problems with a couple of the definitions in the Cygwin
/usr/include files:

1) In limits.h, IOV_MAX is defined as (__INT_MAX__-1) (a *very* large
number).
The other UNIX systems I could examime set it to a much smaller value (like
1024).
The comment says this is the "/* Maximum number of iovcnt in a writev */".
Does Cygwin really support this many? Or is this just a convenient setting?

The reason for the question is that ACE (and TAO) define arrays for the full
number of supported IOV entries, and g++ chokes on an array of size
__INT_MAX__-1

(To set ACE/TAO to compile, I patched this value to 1024)

2) As a convenience (I suppose), math.h has a macro definition for log2.
This is not the case in any other math.h I have been able to examine and
causes a real problem in the development of a platform-independent "log2"
routine.

The problem is that the pre-processor replaces the string "log2" with it's
defined value without regard to context.  This means that while I can write
my own log() function (in my namespace, or course) I cannot write a log2
function -- it won't compile.

(To get ACE/TAO to compile, I patched math.h to remove this define.)

The real questions in this post are:
1) Should there a better value for IOV_MAX in limits.h
2) Should the (as far as I can tell) non-standard define for log2 be removed
(or replaced with a real log2 function?)
3) Should I just go away and be quiet?

Thanks,
	-David.

---------------------
David Dawson
david dot w dot dawson at lmco dot com
703-367-3885


-----Original Message-----
From: Luc Hermitte [mailto:hermitte at free dot fr] 
Sent: Saturday, April 05, 2003 8:06 AM
To: cygwin at cygwin dot com
Subject: Re: ORB


Hello,

* On Fri, Apr 04, 2003 at 05:07:50PM +0200, Vaillant Etienne
<vaillant dot etienne at noos dot fr> wrote:
> I need a ORB for an application under Cygwin. I know Mico and Omniorb 
> but are there other ?

TAO may be -- based on the C++ library ACE.

I am not sure if it has been ported for Cygwin, but it is available on many
different systems -- unices, Windows, etc.

HTH,
-- 
Luc Hermitte

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