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From: Warren on 27 Apr 2010 09:21
Alex R. Mosteo expounded in
news:hr61ms$fsh$2(a)news.eternal-september.org:

> Warren wrote:
>
>> Stephen Leake expounded in news:82fx2lm74h.fsf(a)stephe-leake.org:
>>
>>> Warren <ve3wwg(a)gmail.com> writes:
>>>
>>>> Vadim Godunko expounded in
>>>> news:5867de55-7ca2-4c64-a72f-d2343153eef0
>>>> @k36g2000yqn.googlegroups.com:
>>>>
>>>>> On Apr 23, 5:44 pm, Warren <ve3...(a)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"?
>
> Stab in the dark here; I've read in the past when looking for fully
> statically linked programs that shared runtimes are/were needed for
> c++ exception mechanisms to work; or at least to keep all corner cases
> covered.
>
> So I wouldn't be surprised if -shared did indeed affect some exception
> related stuff.
>
> What I read was something similar to this, but it was a long time ago:
>
> http://www.trilithium.com/johan/2005/06/static-libstdc/

I'll have to read that more closely when I have some time,
but you've convinced me. I'd really like to eliminate any
C++ dependence, since that continues to change with the
wind.

Thanks, Warren
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