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POcannot import module using boost.python
 

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  1. POcannot import module using boost.python
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    <p>I'm trying to build a simple program using boost.python. <br /> I have the following code:</p> <pre><code>//greet.cpp #include &lt;iostream&gt; #include &lt;boost/python.hpp&gt; void greet() { std::cout &lt;&lt; "hello world!" &lt;&lt; std::endl; } BOOST_PYTHON_MODULE(greet) { using namespace boost::python; def("greet", greet); } </code></pre> <p>and the follwing <code>makefile</code>:</p> <pre><code>PYTHON_VERSION := 2.7 PYTHON_INC := /usr/include/python$(PYTHON_VERSION) PYTHON_LIB_LOCATION := /usr/lib/python${PYTHON_VERSION} PYTHON_LIB_FILE := python${PYTHON_VERSION} BOOST_INC := ~/boost_1_54_0 BOOST_LIB_LOCATION := /home/elyashiv/boost_1_54_0/stage/lib BOOST_LIB_FILE := boost_python CC := gcc CFLAGS := -c -fPIC CInc := -I ${BOOST_INC} -I ${PYTHON_INC} CLinkFlags = -shared -Wl,-soname,$@ -L${BOOST_LIB_LOCATION} -l${BOOST_LIB_FILE} -L${PYTHON_LIB_LOCATION} -l${PYTHON_LIB_FILE} greet.o: greet.cpp %.so: %.o gcc ${CLinkFlags} -o $@ $^ %.o: %.cpp ${CC} ${CFLAGS} ${CInc} $^ </code></pre> <p>running <code>make greet.so</code> runs with just a few warnings (redefinition in some boost files). </p> <p>when I try to import the module in python I get the following:</p> <pre><code>Python 2.7.3 (default, Apr 10 2013, 05:46:21) [GCC 4.6.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. &gt;&gt;&gt; import greet Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; ImportError: ./greet.so: undefined symbol: _ZNK5boost6python7objects21py_function_impl_base9max_arityEv </code></pre> <p>what I have done wrong and how to fix it?</p> <p><strong>edit</strong></p> <p>the output of <code>ldd greet.so</code>:</p> <pre><code>linux-gate.so.1 =&gt; (0x001ee000) libgcc_s.so.1 =&gt; /lib/i386-linux-gnu/libgcc_s.so.1 (0x0055d000) libc.so.6 =&gt; /lib/i386-linux-gnu/libc.so.6 (0x0058e000) /lib/ld-linux.so.2 (0x003a2000) </code></pre>
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    1. COIf you are on Linux, could you also paste the output of `ldd greet.so`? Does that show your boost_python library linked in?
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    2. CO@AndréAnjos added.
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    3. COWhere is `libboost_python`? It is not getting linked in, therefore, you have the missing symbol. Make sure your compilation is working as expected.
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