CODEWITHSUNDEEP
pythonc++swig
jkhadka
jkhadka

Reputation: 2543

Undefined symbols for architecture x86_64 while trying to use swig to wrap c++ library to Python

I am trying to wrap a c++ class in Python using swig. I compiled the class and generated .o file and also the wrap file using swig but now when I try to create a library from the files I get the following error. 

$g++ -lpython -dynamiclib vertex.o vertex_wrap.o -o _vertex.so
Undefined symbols for architecture x86_64:
  "Cell::removeVertex(Vertex*)", referenced from:
      Vertex::kill(Vertex*) in vertex.o
      Vertex::~Vertex() in vertex.o
      Vertex::~Vertex() in vertex.o
  "Cell::addVertex(Vertex*)", referenced from:
      Vertex::make(Cell*) in vertex.o
      Vertex::Vertex(Cell*) in vertex.o
      Vertex::Vertex(Cell*) in vertex.o
ld: symbol(s) not found for architecture x86_64

Upvotes: 2

Views: 714

Answers (1)

m7thon
m7thon

Reputation: 3043

Vertex makes calls to a Cell (probably, a Vertex is typically contained in a Cell), namely to Cell::removeVertex(Vertex*) and Cell::addVertex(Vertex*). These functions must be defined in some other source file (perhaps cell.cpp, just guessing).

So you need to compile the source file cell.cpp and link cell.o as well (and perhaps other source files if there are more dependencies)

This has nothing to do with SWIG or wrapping for python by the way.

Upvotes: 1

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