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October 2017

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Boost.Python and Python limited API
by Jason Patton Oct. 11, 2017

Oct. 11, 2017

Apologies on resurrecting a 7.5 year old topic ( https://mail.python.org/pipermail/cplusplus-sig/2010-March/015390.html ) but does anyone else have experience with building Boost.Python with the limited API (see: https://docs.python.org/3/c-api/stable.html and https://www.python.org/dev/peps/pep-0384/ )? My experience suggests that Boost.Python is not compatible, but I'd like to make sure that I'm not missing something with my build process: $ ./bootstrap.sh --with-python=/opt/python/3.6.3/bin/python3.6 --prefix=/opt/boost/1.65.1 Building Boost.Build engine with toolset gcc... tools/build/src/engine/bin.linuxx86_64/b2 Detecting Python version... 3.6 Detecting Python root... /opt/python/3.6.3 <snip> $ ./b2 --with-python # compiles with no errors <snip> $ ./b2 clean <snip> $ ./b2 --with-python define="Py_LIMITED_API=0x03020000" <snip> gcc.compile.c++ bin.v2/libs/python/build/gcc-4.8.5/release/threading-multi/list.o In file included from ./boost/python/object/make_ptr_instance.hpp:8:0, from ./boost/python/to_python_indirect.hpp:11, from ./boost/python/converter/arg_to_python.hpp:10, from ./boost/python/call.hpp:15, from ./boost/python/object_core.hpp:14, from ./boost/python/object.hpp:9, from ./boost/python/list.hpp:10, from libs/python/src/list.cpp:5: ./boost/python/object/make_instance.hpp: In static member function 'static PyObject* boost::python::objects::make_instance_impl<T, Holder, Derived>::execute(Arg&)': ./boost/python/object/make_instance.hpp:35:36: error: invalid use of incomplete type 'PyTypeObject {aka struct _typeobject}' PyObject* raw_result = type->tp_alloc( ^ In file included from /opt/python/3.6.3/include/python3.6/Python.h:68:0, from ./boost/python/detail/wrap_python.hpp:151, from ./boost/python/detail/prefix.hpp:13, from ./boost/python/list.hpp:8, from libs/python/src/list.cpp:5: /opt/python/3.6.3/include/python3.6/object.h:109:12: error: forward declaration of 'PyTypeObject {aka struct _typeobject}' struct _typeobject *ob_type; ^ In file included from ./boost/python/cast.hpp:12:0, from ./boost/python/refcount.hpp:9, from ./boost/python/to_python_indirect.hpp:19, from ./boost/python/converter/arg_to_python.hpp:10, from ./boost/python/call.hpp:15, from ./boost/python/object_core.hpp:14, from ./boost/python/object.hpp:9, from ./boost/python/list.hpp:10, from libs/python/src/list.cpp:5: ./boost/python/base_type_traits.hpp: At global scope: ./boost/python/base_type_traits.hpp:36:25: error: 'PyMethodObject' was not declared in this scope struct base_type_traits<PyMethodObject> ^ ./boost/python/base_type_traits.hpp:36:39: error: template argument 1 is invalid struct base_type_traits<PyMethodObject> ^ In file included from ./boost/python/converter/object_manager.hpp:10:0, from ./boost/python/to_python_value.hpp:19, from ./boost/python/detail/invoke.hpp:19, from ./boost/python/detail/caller.hpp:16, from ./boost/python/object/function_handle.hpp:8, from ./boost/python/converter/arg_to_python.hpp:19, from ./boost/python/call.hpp:15, from ./boost/python/object_core.hpp:14, from ./boost/python/object.hpp:9, from ./boost/python/list.hpp:10, from libs/python/src/list.cpp:5: ./boost/python/converter/pyobject_traits.hpp:31:40: error: 'PyListObject' was not declared in this scope template <> struct pyobject_traits<Py##T##Object> \ ^ ./boost/python/converter/pyobject_traits.hpp:36:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(List); ^ ./boost/python/converter/pyobject_traits.hpp:31:53: error: template argument 1 is invalid template <> struct pyobject_traits<Py##T##Object> \ ^ ./boost/python/converter/pyobject_traits.hpp:36:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(List); ^ ./boost/python/converter/pyobject_traits.hpp:32:25: error: 'PyListObject' was not declared in this scope : pyobject_type<Py##T##Object, &Py##T##_Type> {} ^ ./boost/python/converter/pyobject_traits.hpp:36:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(List); ^ ./boost/python/converter/pyobject_traits.hpp:32:53: error: template argument 1 is invalid : pyobject_type<Py##T##Object, &Py##T##_Type> {} ^ ./boost/python/converter/pyobject_traits.hpp:36:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(List); ^ ./boost/python/converter/pyobject_traits.hpp:31:40: error: 'PyDictObject' was not declared in this scope template <> struct pyobject_traits<Py##T##Object> \ ^ ./boost/python/converter/pyobject_traits.hpp:41:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Dict); ^ ./boost/python/converter/pyobject_traits.hpp:31:53: error: template argument 1 is invalid template <> struct pyobject_traits<Py##T##Object> \ ^ ./boost/python/converter/pyobject_traits.hpp:41:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Dict); ^ ./boost/python/converter/pyobject_traits.hpp:32:25: error: 'PyDictObject' was not declared in this scope : pyobject_type<Py##T##Object, &Py##T##_Type> {} ^ ./boost/python/converter/pyobject_traits.hpp:41:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Dict); ^ ./boost/python/converter/pyobject_traits.hpp:32:53: error: template argument 1 is invalid : pyobject_type<Py##T##Object, &Py##T##_Type> {} ^ ./boost/python/converter/pyobject_traits.hpp:41:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Dict); ^ ./boost/python/converter/pyobject_traits.hpp:31:40: error: 'PyTupleObject' was not declared in this scope template <> struct pyobject_traits<Py##T##Object> \ ^ ./boost/python/converter/pyobject_traits.hpp:42:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Tuple); ^ ./boost/python/converter/pyobject_traits.hpp:31:53: error: template argument 1 is invalid template <> struct pyobject_traits<Py##T##Object> \ ^ ./boost/python/converter/pyobject_traits.hpp:42:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Tuple); ^ ./boost/python/converter/pyobject_traits.hpp:32:25: error: 'PyTupleObject' was not declared in this scope : pyobject_type<Py##T##Object, &Py##T##_Type> {} ^ ./boost/python/converter/pyobject_traits.hpp:42:1: note: in expansion of macro 'BOOST_PYTHON_BUILTIN_OBJECT_TRAITS' BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Tuple); ^ In file included from ./boost/python/object/function_handle.hpp:8:0, from ./boost/python/converter/arg_to_python.hpp:19, from ./boost/python/call.hpp:15, from ./boost/python/object_core.hpp:14, from ./boost/python/object.hpp:9, from ./boost/python/list.hpp:10, from libs/python/src/list.cpp:5: ./boost/python/detail/caller.hpp: In function 'PyObject* boost::python::detail::get(mpl_::int_<BOOST_PP_ITERATION_0>, PyObject* const&)': ./boost/python/detail/caller.hpp:48:36: error: there are no arguments to 'PyTuple_GET_ITEM' that depend on a template parameter, so a declaration of 'PyTuple_GET_ITEM' must be available [-fpermissive] return PyTuple_GET_ITEM(args_,N); ^ ./boost/python/detail/caller.hpp:48:36: note: (if you use '-fpermissive', G++ will accept your code, but allowing the use of an undeclared name is deprecated) ./boost/python/detail/caller.hpp: In function 'unsigned int boost::python::detail::arity(PyObject* const&)': ./boost/python/detail/caller.hpp:53:34: error: 'PyTuple_GET_SIZE' was not declared in this scope return PyTuple_GET_SIZE(args_); ^ "g++" -O3 -finline-functions -Wno-inline -Wall -pthread -fPIC -m64 -DBOOST_ALL_NO_LIB=1 -DBOOST_PYTHON_SOURCE -DNDEBUG -DPy_LIMITED_API=0x03020000 -I"." -I"/opt/python/3.6.3/include/python3.6" -c -o "bin.v2/libs/python/build/gcc-4.8.5/release/threading-multi/list.o" "libs/python/src/list.cpp" ...failed gcc.compile.c++ bin.v2/libs/python/build/gcc-4.8.5/release/threading-multi/list.o... <snip a bunch more errors> And so libboost_python3 is never built, e.g.: ...skipped <pbin.v2/libs/python/build/gcc-4.8.5/release/link-static/threading-multi>libboost_python3.a for lack of <pbin.v2/libs/python/build/gcc-4.8.5/release/link-static/threading-multi>list.o... I can attach the rest of the output if anyone finds some use, let me know. Thanks Jason Patton

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