Re: Autoconf & gnat Help Needed

[Stephen Leake <stephen_leake@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.

-- 
-- Stephe