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POHow to resolve an unresolved symbol?
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  1. POHow to resolve an unresolved symbol?
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    copied!<p>Greetings.</p> <p>I'm having a problem dynamically linking my lib to my program. Here's what's happening : I'm developing a modular program and testing the module system. The thing is my modules uses some class that are defined in the main binary : some abstract classes, which don't cause any issues, and a very concrete class, which just can't be resolved.</p> <p>I'm using the dlopen / dlsym / dlclose set of functions. And I compile using g++.</p> <p>The thing is : if I ask dlopen to load all the symbols, then it fails telling me <code>"undefined symbol: _ZNK3zia3api8DataTreecvRKSsEv</code> But if I launch dlopen in lazy mode, it will only happen at the first usage of the so-called class (and crash right after that).</p> <p>So this is the "DataTree" class, and I want to make it available for both the main binary and the modules. I already tried to compile it in each of the binaries : as I expected, it didn't work. I also tried to make it entirely inline, but it's as useless as my other attempt. I tried to compile the main binary with the option "-rdynamic". No changes.</p> <p>I've been searching, asking to friends since yesterday but nobody seems to know how to solve this kind of problems.</p> <p>I compile the objects of the module with the option -fPIC, like this :</p> <pre><code>g++ -Wall -fPIC -c mysource.cpp </code></pre> <p>And then I use this line to make the library :</p> <pre><code>g++ -shared -Wl,-soname,mylib.so.1 -o mylib.so mysource.o </code></pre> <p>I suppose the best solution would be to not compile the object within the library, but to make the symbol available from the main binary. So the question is : how to do so ? (and is it what I must do ?)</p>
 

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