From 2269984241064532798 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,a554381e70cda7e7,start X-Google-Attributes: gidf78e5,public X-Google-Thread: fc772,a554381e70cda7e7,start X-Google-Attributes: gidfc772,public From: ruchrist@online.no (Rune Christensen) Subject: Adding extensions to library at link time Date: 1997/07/21 Message-ID: #1/1 X-Deja-AN: 258008332 X-Submission-Address: c++-submit@netlab.cs.rpi.edu X-Original-Date: Mon, 21 Jul 1997 08:06:19 GMT X-Approved: Herb Sutter comp.lang.c++.moderated Organization: Win.HLP X-Auth: PGPMoose V1.1 PGP comp.std.c++ iQBFAgUBM9OofOEDnX0m9pzZAQFWJgGAjLTp6qC3j6r/AEb4wQXP6dqBbxYaJ7Ty JjmkkaBpXdxM82jiUpeTPCKIp0Cr2gCP =4Eux Reply-To: ruchrist@online.no Newsgroups: comp.lang.c++.moderated,comp.std.c++ Originator: fjh@murlibobo.cs.mu.OZ.AU I have written a library system where I want the user / client to be able to add extensions at link time. The extension should automatically be added whenever a global function (or object / variable) exists in the client code (Preferably it should be added to some library array so that multiple extensions can be handled). This to guarantee that extension has been hooked up already when constructors for static objects are called, and so the client doesn't have to make sure the extension has been added 'in time'. I remember that for Borland C++ this could be implemented by defining a dummy (empty) function in a library. If linker found that name in earlier linked object file (or library?), it would ignore this second instance. Is this Borland C++ 'feature' standard C/C++? (Does standard say anything relevant about linking?) Can anyone suggest any other standard way to implement this? Best regards, Rune Christensen [ Send an empty e-mail to c++-help@netlab.cs.rpi.edu for info ] [ about comp.lang.c++.moderated. First time posters: do this! ] --- [ comp.std.c++ is moderated. To submit articles: try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ FAQ: http://reality.sgi.com/employees/austern_mti/std-c++/faq.html ] [ Policy: http://reality.sgi.com/employees/austern_mti/std-c++/policy.html ] [ Comments? mailto:std-c++-request@ncar.ucar.edu ]