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POC++ Compiling with Python.h Undefined Symbols
 

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  1. POC++ Compiling with Python.h Undefined Symbols
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    <p>So, I've been trying to start using Python.h for a little project I want to work on that seems pretty /simple/. But before I start I want to try to learn how to use Python.h. So I found this little example online.</p> <pre><code>#include "Python/Python.h" int main(int argc, char** argv) { Py_Initialize(); PyRun_SimpleString("print 'Test'"); PyRun_SimpleString("print str(3 + 5)"); Py_Exit(0); } </code></pre> <p>Seems pretty straight forward. When i first used</p> <pre><code>gcc test.cpp </code></pre> <p>to compile, i got some undefined symbols. I quickly found out I should use</p> <pre><code>-lpython2.7 </code></pre> <p>then I found out I could also use</p> <pre><code>-L/Library/Frameworks/Python.framework/Versions/2.7/lib/ </code></pre> <p>that didn't work (I made sure that /Library/Frameworks/Python/Versions/2.7/lib/ existed) I'm stuck, what do I do? I get</p> <pre><code>Undefined symbols: "_Py_Initialize", referenced from: _main in ccoUOSlc.o "_PyRun_SimpleStringFlags", referenced from: _main in ccoUOSlc.o _main in ccoUOSlc.o "___gxx_personality_v0", referenced from: _main in ccoUOSlc.o CIE in ccoUOSlc.o "_Py_Exit", referenced from: _main in ccoUOSlc.o ld: symbol(s) not found collect2: ld returned 1 exit status </code></pre> <p>EDIT: I just tried using the -Framework argument, and tried adding after the -L the -l python2.7 argument, and I now get</p> <pre><code>Undefined symbols: "___gxx_personality_v0", referenced from: _main in ccfvtJ4j.o CIE in ccfvtJ4j.o ld: symbol(s) not found collect2: ld returned 1 exit status </code></pre> <p>Now what?</p>
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    1. USBrian Smith
    1. USBrian Smith
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      1. USDavid Lam
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    1. COThis should work (just tested on Linux, using GCC and Python 2.7). Could you confirm that `libpython2.7.so` exists in the directory you specified with the `-L` option?
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      1. USjogojapan
    2. COuhm. actually there is no libpython2.7.so there is libpython2.7.dylib in there though (on Mac OSX 10.6.8 if that helps)
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      1. POC++ Compiling with Python.h Undefined Symbols
      1. USBrian Smith
    3. CORight. I had assumed Linux, but on MacOS that should be fine. Not sure what's causing the problem.
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