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POg++ linking undefined reference even though my shared object has those methods
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  1. POg++ linking undefined reference even though my shared object has those methods
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    copied!<p>Edit: Answer found. Ignore</p> <p>Sorry to ask this question even though it's been asked so many times but I've checked like 20+ similar questions and none of them have helped.</p> <p>I've created a shared object and am now using it in a program that links to that .so. The program is not able to link (ld error). </p> <p><strong>memfxns.h:</strong></p> <pre><code>#ifndef MEM_H #define MEM_H char* getBuf(); void releaseBuf(char*); #endif </code></pre> <p><strong>memfxns.cpp:</strong></p> <pre><code>#include "memfxns.h" char* getBuffer() { char* ret_val = new char[4]; //fill the buffer here return ret_val; } void releaseBuffer(char* buf) { delete buf; } </code></pre> <p>These guys are compiled like so to produce a shared object (note I've tried without the -soname because it appears to be repetitive, but did not succeed):</p> <pre><code>g++ -Wall -fPIC -c ./*.cpp g++ -shared -Wl,-soname,libmemfxns.so -o ./libmemfxns.so ./*.o </code></pre> <p>Now I want to get my program to link against the new .so:</p> <p><strong>prog.cpp:</strong></p> <pre><code>#include &lt;stdio.h&gt; #include "memfxns.h" int main() { char* buf = getBuf(); for(int i = 0; i &lt; 4; i++) printf("%d\n", buf[i]); releaseBuf(buf); return 0; } </code></pre> <p>Which I compile using the command:</p> <pre><code>g++ ./prog.cpp -o prog -I/home/jbu/Desktop/hadooprelated/testjna/so/include -L/home/jbu/Desktop/hadooprelated/testjna/so -lmemfxns /tmp/ccOR12i1.o: In function `main': prog.cpp:(.text+0x9): undefined reference to `getBuf()' prog.cpp:(.text+0x55): undefined reference to `releaseBuf(char*)' collect2: error: ld returned 1 exit status make: *** [all] Error 1 </code></pre> <p>I'm fairly sure that it's able to find libmemfxns.so because when I purposely call -lmemfxnsdoesntexist it complains that it cannot find the .so. I'm also sure my -L and -I directories are correct.</p> <p>I'm not sure if I need some kind of namespace/scoping in my header file but I have not seen examples need that...</p> <p>Any help would be greatly appreciated.</p> <p>Thanks, -Julian</p>
 

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