X-Spam-Check-By: sourceware.org Message-ID: <44E3153B.5080304@byu.net> Date: Wed, 16 Aug 2006 06:53:15 -0600 From: Eric Blake User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.5) Gecko/20060719 Thunderbird/1.5.0.5 Mnenhy/0.7.4.666 MIME-Version: 1.0 To: cygwin@cygwin.com, avi.cohenstuart@ssaglobal.com Subject: Re: openmotif, .rdata, shared libs and runtime linking/loading problem References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm 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 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 According to Avi Cohen Stuart on 8/15/2006 2:34 PM: > Hi, > > Please let me know if this is the correct newsgroup. Actually, it is officially a mailing list (in spite of the fact that there are some newsgroup frontends that people have created on the web). > > When using windbg it reports a access violation here, apperantly during the > resolving of shared libaries. The cygwin and libtool archives document an issue where exporting a library variable can cause problems, because initializing a const pointer variable with its address will cause the const variable to live .rodata but need a dynamic adjustment when the library is loaded; hence a SIGSEGV. I'm not fully sure of the details (so I hope I described the windows .dll limitation correctly), but it sounds like you may have run into this issue. Perhaps you can find the place that takes the address of a library variable and make that pointer non-const (so it won't be in .rodata). A more generic solution is to NEVER export variables in libraries, only accessor functions. - -- Life is short - so eat dessert first! Eric Blake ebb9@byu.net -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.1 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFE4xU684KuGfSFAYARArcVAJ4jXJa9EtxR3bIEgTn0gSps8p/YdgCfcV0y 5VRmydPURuC+A9VoikcLjPc= =799z -----END PGP SIGNATURE----- -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/