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POld linkage problems: /usr/bin/ld: cannot find [libraryname]
 

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  1. POld linkage problems: /usr/bin/ld: cannot find [libraryname]
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    <p>Im using Qmake to build a shared library on Ubuntu 9.10</p> <p>This shared library (A) has a dependency on another shared library (B).</p> <p>project B has been successfully built.</p> <p>in the .pro file for project A, my LIBS variable looks like this:</p> <pre><code>LIBS += -L../datelib/bin -llibdatelib_release.so.1.0.0 </code></pre> <p>(I used the full shlib name because the library versions are different.)</p> <p>In any case, when I attempt to build project A, it breaks at the linkage stage, and prints the error message:</p> <pre><code>/usr/bin/ld: cannot find -llibdatelib_release.so.1.0.0 collect2: ld returned 1 exit status make[1]: ***[bin/libprojecta_release.so.6.0.0] Error 1 make ***[release] Error 2 Exited with code 2 </code></pre> <p>From the error message, I thought ld was complaining that it could not locate the libdatelib file, so I manually copied it to /usr/lib/</p> <p>however, that did not solve the problem, and I am getting the same error message.</p> <p>Anyone knows how to fix this?</p> <p><strong>[Edit]</strong></p> <p>I'm quite new to building using gcc. I know how to create symbolic links, but which paths do I use for the lnk command?. The file I want to link to is in /home/username/work/cppdev/datelib/bin.</p> <p>Also the build system I use (qmake), automatically creates symbolic links as part of the build, so I already have the following files in my /home/username/work/cppdev/datelib/bin folder:</p> <ul> <li>libdatelib_release.so (sym link)</li> <li>libdatelib_release.so.1 (sym link)</li> <li>libdatelib_release.so.1.0 (sym link)</li> <li>libdatelib_release.so.1.0.0 (shared lib)</li> </ul> <p>I may have to ask another question to explain why there are so many symlinks (whats the point?), and why I cant just link directly to a shared lib, but have to go through a symbolic link. I've read some online docs, but what I've seen so far seems more like dictum/tradition rather than actual technical reasons WHY this level of abstraction is required when linking on Linux.</p>
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    1. COI'm not an expert on building & linking under Linux and have often had similar problems to yours. However, what I _can_ do is recommend the following excellent article about dealing with shared libraries on IBM DeveloperWorks: [**_Dissecting shared libraries - Get to know your shared library_** (by Peter Seebach)][seebach]. The section _"Modifying the dynamic linker search path"_ might be especially of interest to you. [seebach]: http://www.ibm.com/developerworks/linux/library/l-shlibs.html
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