Linking error with Boost.python while compiling - c++

Question

Am trying to build the example inspired from here
My original intention is to be able to call C++ code from within Python. I'm just running the examples from the Boost documentation in order to achieve this goal.
Here's my makefile
CXX := g++
CXX_FLAGS := -Wall -Wextra -std=c++17 -ggdb
BIN := bin
SRC := src
INCLUDE := inc
LIB := lib
BOOST_ROOT := /home/eicossa/repo/boost_install
BOOST_INCL := ${BOOST_ROOT}/include/
BOOST_LIBS := ${BOOST_ROOT}/libs/
PYTHON_INCL := /usr/include/python3.7m/
PYTHON_LIBS := /usr/lib/python3.7/
LIBFLAGS := -lboost_system
EXECUTABLE := greet
all: $(BIN)/$(EXECUTABLE)
run: clean all
clear
./$(BIN)/$(EXECUTABLE)
$(BIN)/$(EXECUTABLE): $(SRC)/*.cpp
$(CXX) $(CXX_FLAGS) -I$(PYTHON_INCL) -I$(INCLUDE) -I$(BOOST_INCL) -L$(BOOST_LIBS) -L$(PYTHON_LIBS) -L$(LIB$
clean:
-rm $(BIN)/*
This leads to the following errors
/tmp/ccNVjFX3.o: In function boost::python::api::object::object()':
/home/eicossa/repo/boost_install/include/boost/python/object_core.hpp:400:
undefined reference to_Py_NoneStruct' /tmp/ccQNpbxG.o: In function
PyInit_hello_ext':
/home/eicossa/Dropbox/wtcd/license/boost/src/bindings.cpp:3: undefined
reference toboost::python::detail::init_module(PyModuleDef&, void
()())' /tmp/ccQNpbxG.o: In function boost::python::type_info::name()
const':
/home/eicossa/repo/boost_install/include/boost/python/type_id.hpp:160:
undefined reference toboost::python::detail::gcc_demangle(char
const)' /tmp/ccQNpbxG.o: In function
boost::python::to_python_value<char const* const&>::operator()(char
const* const&) const':
/home/eicossa/repo/boost_install/include/boost/python/converter/builtin_converters.hpp:157:
undefined reference to
boost::python::converter::do_return_to_python(char const*)'
/tmp/ccQNpbxG.o: In function boost::python::to_python_value<char
const* const&>::get_pytype() const':
/home/eicossa/repo/boost_install/include/boost/python/converter/builtin_converters.hpp:157:
undefined reference toPyUnicode_Type' /tmp/ccQNpbxG.o: In function
void boost::python::def<char const* (*)()>(char const*, char const*
(*)())':
/home/eicossa/repo/boost_install/include/boost/python/def.hpp:91:
undefined reference toboost::python::detail::scope_setattr_doc(char
const*, boost::python::api::object const&, char const*)'
/tmp/ccQNpbxG.o: In function `boost::python::api::object
boost::python::detail::make_function_aux
(char const* (*)(), boost::python::default_call_policies const&, boost::mpl::vector1 const&)':
/home/eicossa/repo/boost_install/include/boost/python/make_function.hpp:38:
undefined reference to
boost::python::objects::function_object(boost::python::objects::py_function
const&)' /tmp/ccQNpbxG.o: In function
boost::python::objects::py_function_impl_base::py_function_impl_base()':
/home/eicossa/repo/boost_install/include/boost/python/object/py_function.hpp:20:
undefined reference to vtable for
boost::python::objects::py_function_impl_base'
/tmp/ccQNpbxG.o:(.rodata._ZTVN5boost6python7objects23caller_py_function_implINS0_6detail6callerIPFPKcvENS0_21default_call_policiesENS_3mpl7vector1IS6_EEEEEE[_ZTVN5boost6python7objects23caller_py_function_implINS0_6detail6callerIPFPKcvENS0_21default_call_policiesENS_3mpl7vector1IS6_EEEEEE]+0x30):
undefined reference to
boost::python::objects::py_function_impl_base::max_arity() const'
/tmp/ccQNpbxG.o: In function
boost::python::objects::caller_py_function_impl<boost::python::detail::caller<char
const* (*)(), boost::python::default_call_policies,
boost::mpl::vector1<char const*> > >::~caller_py_function_impl()':
/home/eicossa/repo/boost_install/include/boost/python/object/py_function.hpp:30:
undefined reference to
boost::python::objects::py_function_impl_base::~py_function_impl_base()'
/tmp/ccQNpbxG.o:(.rodata._ZTIN5boost6python7objects23caller_py_function_implINS0_6detail6callerIPFPKcvENS0_21default_call_policiesENS_3mpl7vector1IS6_EEEEEE[_ZTIN5boost6python7objects23caller_py_function_implINS0_6detail6callerIPFPKcvENS0_21default_call_policiesENS_3mpl7vector1IS6_EEEEEE]+0x10):
undefined reference to typeinfo for
boost::python::objects::py_function_impl_base' /tmp/ccQNpbxG.o: In
functionboost::python::converter::expected_pytype_for_arg::get_pytype()':
/home/eicossa/repo/boost_install/include/boost/python/converter/pytype_function.hpp:69:
undefined reference to
boost::python::converter::registry::query(boost::python::type_info)'
/home/eicossa/repo/boost_install/include/boost/python/converter/pytype_function.hpp:70:
undefined reference to
boost::python::converter::registration::expected_from_python_type()
const' collect2: error: ld returned 1 exit status Makefile:27: recipe
for target 'bin/greet' failed make: *** [bin/greet] Error 1
What am i doing wrong ?

Answer 1

CXX := g++
CXX_FLAGS := -Wall -Wextra -std=c++17 -ggdb
BIN := bin
SRC := src
INCLUDE := inc
LIB := lib
BOOST_ROOT := /home/eicossa/repo/boost_install
BOOST_INCL := ${BOOST_ROOT}/include/
BOOST_LIBS := ${BOOST_ROOT}/libs/
PYTHON_INCL := /usr/include/python3.7m/
PYTHON_LIBS := /usr/lib/python3.7/
LIBFLAGS := -lboost_system -lboost_python37 -lpython3.7m #changes made here
EXECUTABLE := greet
all: $(BIN)/$(EXECUTABLE)
run: clean all
clear
./$(BIN)/$(EXECUTABLE)
$(BIN)/$(EXECUTABLE): $(SRC)/*.cpp
$(CXX) $(CXX_FLAGS) -I$(PYTHON_INCL) -I$(INCLUDE) -I$(BOOST_INCL) -L$(BOOST_LIBS) -L$(PYTHON_LIBS) -L$(LIB$
clean:
-rm $(BIN)/*
Try out these changes in the Makefile