X-Spam-Check-By: sourceware.org Message-ID: <4683D230.9030705@cygwin.com> Date: Thu, 28 Jun 2007 11:22:24 -0400 From: "Larry Hall (Cygwin)" Reply-To: cygwin@cygwin.com User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.3) Gecko/20070505 Remi/2.0.0.0-3.fc4.remi Thunderbird/2.0.0.0 Mnenhy/0.7.5.0 MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: How to link with third party libraries using gcc References: <11331072.post@talk.nabble.com> <4682C0EE.D7088ADD@dessent.net> <11342161.post@talk.nabble.com> In-Reply-To: <11342161.post@talk.nabble.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Id: 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 km4hr wrote: > Brian, > > It sounds like the solution could range from something as simple as > including the ".lib" files on the gcc command line on up to complicated > stuff I've never heard of like "decorations", "toolchains", and "calling > conventions". > > I tried the simple suggestion. I copied the ".lib" files to the directory > where my program is located. I then entered the following command: > > gcc myprog.c library1.lib library2.lib -o myprog > > I got "undefined reference to ..." errors. One for each library function in > my program. > > Next I removed the ".lib" files from the gcc command string as follows: > > gcc myprog.c -o myprog > > I got exactly the same errors as I did with the ".lib" files included. > Apparently gcc has no idea what the ".lib" files are. No, it means the '.lib' you gave it doesn't have any of the symbols you need. 'nm' it and see if it has any symbols at all and what they look like. Compare that with feedback you get from the link. If the symbols look similar but are different by just "@" and some number suffixes, then you have a calling convention/decoration problem. Time to read up on that stuff. > Since I have no comprehesion of "decorations", "toolchains", and "calling > conventions", or how to find out what that means, I wonder if there's > another explanation. I've got a sinking feeling about this. As if I'm going > where no man has gone before. Not at all. But you need to learn a little bit about the platform you're working with before things will make some sense to you. -- Larry Hall http://www.rfk.com RFK Partners, Inc. (508) 893-9779 - RFK Office 216 Dalton Rd. (508) 893-9889 - FAX Holliston, MA 01746 _____________________________________________________________________ A: Yes. > Q: Are you sure? >> A: Because it reverses the logical flow of conversation. >>> Q: Why is top posting annoying in email? -- 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/