Hi Cheok, By specifying the argument: -Wl,-soname,libmean.so.1 The executable will search for 'libmean.so.1' file at runtime to load. But this does not exist. So you would also need to create a link from your actual library to this name. So in addition to the suggestion by 'Oliver' you will need to add "ln -s libmean.so.1.0.1 libmean.so.1" I am not sure why you are setting the 'soname' to a different name to the resulting library, this seems dangerous to me (unless you can always guarantee binary compatibility between all versions of libmean.so.1.X). The general rule for building shared libs I use is: g++ -shared -Wl,-soname,lib<LIBNAME>.so.<MAJ_VER>.<MIN_VER> -o lib<LIBNAME>.so.<MAJ_VER>.<MIN_VER> <FILES> ln -s lib<LIBNAME>.so.<MAJ_VER>.<MIN_VER> lib<LIBNAME>.so.<MAJ_VER> ln -s lib<LIBNAME>.so.<MAJ_VER> lib<LIBNAME>.so -----Original Message----- From: gcc-help-owner@xxxxxxxxxxx [mailto:gcc-help-owner@xxxxxxxxxxx] On Behalf Of Olivier Rochecouste Sent: 13 December 2004 10:30 To: gcc-help@xxxxxxxxxxx Subject: Re: Dynamic Linking Library Problem Using GCC Hi Cheok, I'm not an expert but I think you should make a symlink to your shared library: "ln -s libmean.so.1.0.1 libmean.so" ld should be able to find the .so now -- Olivier > Hi, > > I read through the tutorial > http://www.adp-gmbh.ch/cpp/gcc/create_lib.html in buidling dynamic > library using gcc. It is interesting. > However, after following the steps inside the tutorial, it doesn't > work in my system. > > Here is the sequence of steps which I had performed: > > [yccheok@localhost project]$ ls -al > total 28 > drwxrwxr-x 2 yccheok yccheok 4096 Dec 13 01:16 . > drwx------ 65 yccheok yccheok 12288 Dec 13 00:58 .. > -rw-rw-r-- 1 yccheok yccheok 56 Dec 13 00:48 > calc_mean.c > -rw-rw-r-- 1 yccheok yccheok 29 Dec 13 00:48 > calc_mean.h > -rw-rw-r-- 1 yccheok yccheok 224 Dec 13 00:49 > main.c > [yccheok@localhost project]$ gcc -c -fPIC calc_mean.c -o calc_mean.o > [yccheok@localhost project]$ gcc -shared > -Wl,-soname,libmean.so.1 -o > libmean.so.1.0.1 calc_mean.o > [yccheok@localhost project]$ gcc main.c -o dynamically_linked -L. > -lmean > /usr/bin/ld: cannot find -lmean > collect2: ld returned 1 exit status > [yccheok@localhost project]$ ls -al > total 40 > drwxrwxr-x 2 yccheok yccheok 4096 Dec 13 01:17 . > drwx------ 65 yccheok yccheok 12288 Dec 13 00:58 .. > -rw-rw-r-- 1 yccheok yccheok 56 Dec 13 00:48 > calc_mean.c > -rw-rw-r-- 1 yccheok yccheok 29 Dec 13 00:48 > calc_mean.h > -rw-rw-r-- 1 yccheok yccheok 908 Dec 13 01:16 > calc_mean.o > -rwxrwxr-x 1 yccheok yccheok 4349 Dec 13 01:16 > libmean.so.1.0.1 > -rw-rw-r-- 1 yccheok yccheok 224 Dec 13 00:49 > main.c > [yccheok@localhost project]$ > > Can you please advice on why the ld cannot find the mean library. Do I > need to prior perform anything with ldconfig before i dynamic linked > my main application with the mean library? > > Thank you! > > -cheok > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com >
