X-Recipient: archive-cygwin@delorie.com X-Spam-Check-By: sourceware.org Date: Thu, 5 Nov 2009 10:48:21 +0100 From: Corinna Vinschen To: cygwin@cygwin.com Subject: Re: Shall dlopen("foo") succeeed if only "foo.dll" exists? Message-ID: <20091105094821.GJ26344@calimero.vinschen.de> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <20091102164807.GA2897@calimero.vinschen.de> <4AEF9E10.6030804@byu.net> <20091103100045.GA18643@calimero.vinschen.de> <4AF0D545.7060407@cwilson.fastmail.fm> <20091104092938.GB31924@calimero.vinschen.de> <4AF248D2.7090208@cwilson.fastmail.fm> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4AF248D2.7090208@cwilson.fastmail.fm> User-Agent: Mutt/1.5.20 (2009-06-14) Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On Nov 4 22:38, Charles Wilson wrote: > Corinna Vinschen wrote: > > > But what about perl? It uses the .dll suffix for modules on Cygwin. > > perl uses dl_dlopen.xs on cygwin AFAICT, which basically passes its > arguments unchanged to the system dlopen. > > > Does it call dlopen("foo.dll") or dlopen("foo")? > > Looking at DynaLoader_pm.PL (this is self-modifying code, used to > generate the actual DynaLoader.pm, so it's a little odd): > [...] > On cygwin: > use Config; print join("\n",@Config::Config{qw(dlext so dlsrc)}); > dll > dll > dl_dlopen.xs > > So it looks like perl itself accepts either a "bare" library name, or a > properly .dll-decorated one (or even "-lfoo"!) -- but will eventually > try the .dll extension if "bare" fails. It looks like perl tries the dll suffix immediately. I just tried this: $ perl -e 'use Alias;' under strace and the first access is already to the file called /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/auto/Alias/Alias.dll I removed the automatic adding of the .dll suffix, and the above perl statement still works fine and dlopen succeeds. I'm going to check this change in. I think I should prepare a new Cygwin release quite soon, not only for testing this change, but also due to the cygpath problem. Thanks to all of you, Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple