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POdynamic linking woes using c++
 

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  1. POdynamic linking woes using c++
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    <ul> <li><a href="http://github.com/hydroo/sandbox/blob/master/src/main.cpp" rel="nofollow noreferrer">main.cpp</a> &lt;- line 106 to 164 invoke dlopen/dlsym/dlclose</li> <li><a href="http://github.com/hydroo/sandbox/blob/master/src/basefilter.hpp" rel="nofollow noreferrer">basefilter.hpp</a> &lt;- naked abstract base class</li> <li><a href="http://github.com/hydroo/sandbox/blob/master/src/basefilter.cpp" rel="nofollow noreferrer">basefilter.cpp</a></li> <li><a href="http://github.com/hydroo/sandbox/blob/master/src/filters/examplefilter.hpp" rel="nofollow noreferrer">examplefilter.hpp</a> &lt;- a test plugin</li> <li><a href="http://github.com/hydroo/sandbox/blob/master/src/filters/examplefilter.cpp" rel="nofollow noreferrer">examplefilter.cpp</a></li> <li><a href="http://github.com/hydroo/sandbox" rel="nofollow noreferrer">everything</a> &lt;- the repository</li> </ul> <p>Running the whole thing will result in the following error:</p> <pre><code>Cannot open library "./libexamplefilter.so" ./libexamplefilter.so: undefined symbol: _ZTI10BaseFilter </code></pre> <p>Since the code is pretty small and understandable you should be able to understand it right away. Anyone a clue what is wrong?</p> <p>Should I make rather declare create() as extern "C" void* create(void); and cast the void pointer afterwards instead of directly trying to link c++ symbols?</p> <p><strong>Next Step</strong></p> <p>after using <code>-Wl,-export-dynamic</code>, it tells me:</p> <pre><code>Cannot load library symbols "./libexamplefilter.so" ./libexamplefilter.so: undefined symbol: create </code></pre> <p>Uh, do I have to give a mangled c++-name there instead of "dlsym(handle, "create")". Probably. Is there a elegant way to do this?</p> <p>The answer is declaring create() extern "C" ... create .... This works perfectly well. Problem solved. Thanks for your help and patience.</p>
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    1. COedited, because the next question arose (and I did not want to open a separate thread)
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