Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@sources.redhat.com Delivered-To: mailing list cygwin@sources.redhat.com From: Chris Faylor Date: Tue, 12 Sep 2000 10:06:16 -0400 To: cygwin@sources.redhat.com Subject: Re: problem with dynamic_cast Message-ID: <20000912100616.B32019@cygnus.com> Reply-To: cygwin@sources.redhat.com Mail-Followup-To: cygwin@sources.redhat.com References: <20000908124631.C13006@cygnus.com> <20000908230049.A21412@cygnus.com> <7767-Tue12Sep2000145500+0100-starksb@ebi.ac.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.6i In-Reply-To: <7767-Tue12Sep2000145500+0100-starksb@ebi.ac.uk>; from starksb@ebi.ac.uk on Tue, Sep 12, 2000 at 02:55:00PM +0100 On Tue, Sep 12, 2000 at 02:55:00PM +0100, David Starks-Browning wrote: >On Friday 8 Sep 00, Chris Faylor writes: >> On Fri, Sep 08, 2000 at 12:46:31PM -0400, Chris Faylor wrote: >> >On Fri, Sep 08, 2000 at 10:18:42AM -0400, Fleischer, Karsten (K.) wrote: >> >>How about including the stub libraries in the distribution, rather than the >> >>symlinks? >> > >> >The reason for the symlinks is that some packages search libc.a and libm.a >> >for symbols. >> > >> >If linking libc.a twice causes problems, then it *is* a bug in either gcc or >> >ld. >> > >> >Mumit had vowed once to fix this problem but then he disappeared... >> >> Ok, I looked into this. It is a linker problem. Specifying -lm or -lc on >> the command line causes ld to put symbols into the import section in improperly >> sorted order. >> >> This confuses the Windows "dynamic loader" (and I use the term loosely) so that >> certain function calls (namely strcmp and strlen) are not resolved. So when >> a function in libgcc needs to call strcmp it ends up jumping into unallocated >> memory, causing a SIGSEGV. >> >> That's the analysis. I have no idea how to fix this, but I've sent some details >> to DJ in the hopes that he'll be able to do something about this. > >Would it be helpful if I put this in the FAQ? >(Under "Known Problems in the Current Net Release".) Yes. "We" (this is the royal we) are working on the problem in the meantime. cgf -- Want to unsubscribe from this list? Send a message to cygwin-unsubscribe@sourceware.cygnus.com