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From: Warren <ve3wwg@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Autoconf & gnat Help Needed
Date: Mon, 26 Apr 2010 15:01:07 +0000 (UTC)
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Date: 2010-04-26T15:01:07+00:00
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Stephen Leake expounded in news:82fx2lm74h.fsf@stephe-leake.org:

> Warren <ve3wwg@gmail.com> writes:
> 
>> Vadim Godunko expounded in news:5867de55-7ca2-4c64-a72f-d2343153eef0
>> @k36g2000yqn.googlegroups.com:
>>
>>> On Apr 23, 5:44 pm, Warren <ve3...@gmail.com> wrote:
>>>>
>>>> For a basic interpreter, making use of ncurses, libgmp, libgsl,
>>>> and PostgreSQL etc., it is unavoidable. :)  I tried to avoid C++
>>>> like the plague, but ncurses requires a C++ main, if GNAT exceptions
>>>> are to work correctly. I'm not sure of the details why, but a GNAT
>>>> exception + ncurses and a C or gnat main leads to an abort.
>>>> Switching to a C++ main program has corrected that.
>>>>
>>> Did you try to pass -shared to gnatbind?
>>
>> No, but is that really relevant? 
>>
>> The problem was not library linkage, but the fact that 
>> if an exception was raised in the Ada modules, the 
>> exception handler would not work -- the whole unit 
>> would abort.
> 
> Lots of things are relevant in exception handling.
> 
> First is the exception handling mechanism; set-jump/long-jump vs zero
> cost. GNAT supports both, with zero cost the default; Windows dlls
> require sj/lj.
> 
> It may be that using a C++ main also implies the sj/lj mechanism.

Ok, but how is that connected with "-shared"?

Warren