From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: 103376,12c54a0f5a27d882 X-Google-NewGroupId: yes X-Google-Attributes: gida07f3367d7,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news2.google.com!news1.google.com!border1.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!feedme.ziplink.net!news.swapon.de!eternal-september.org!.POSTED!not-for-mail From: "Alex R. Mosteo" Newsgroups: comp.lang.ada Subject: Re: Autoconf & gnat Help Needed Followup-To: comp.lang.ada Date: Tue, 27 Apr 2010 08:57:43 +0200 Organization: A noiseless patient Spider Message-ID: References: <82sk6nn4vn.fsf@stephe-leake.org> <82ochamzq1.fsf@stephe-leake.org> <5867de55-7ca2-4c64-a72f-d2343153eef0@k36g2000yqn.googlegroups.com> <82fx2lm74h.fsf@stephe-leake.org> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7Bit Injection-Date: Tue, 27 Apr 2010 06:54:21 +0000 (UTC) Injection-Info: news.eternal-september.org; posting-host="w8g++bW4v3KH0+SqtoCNSw"; logging-data="16273"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18kPTQR4bG6QRohZI1cwtps" User-Agent: KNode/4.4.2 Cancel-Lock: sha1:JtjLuKanzhhrgTbHyAgo1T5R4EA= Xref: g2news2.google.com comp.lang.ada:11201 X-Original-Bytes: 3176 Date: 2010-04-27T08:57:43+02:00 List-Id: Warren wrote: > Stephen Leake expounded in news:82fx2lm74h.fsf@stephe-leake.org: > >> Warren writes: >> >>> Vadim Godunko expounded in news:5867de55-7ca2-4c64-a72f-d2343153eef0 >>> @k36g2000yqn.googlegroups.com: >>> >>>> On Apr 23, 5:44 pm, Warren 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/