[英]Manually build a shared object using boost::python
I'm trying to create a shared object using boost::python
(installed through homebrew) that's loadable in Python on OS X using the Python 2.7 that ships with the OS. 我正在尝试使用
boost::python
(通过自制程序安装)创建共享库,该共享库可使用OS随附的Python 2.7在OS X上的Python中加载。 What libraries do I have to link in to get a usable shared object? 我必须链接到哪些库才能获得可用的共享库?
Here's hello_ext.cpp
, taken from the tutorial 这是来自本教程的
hello_ext.cpp
// hello_ext.cpp
char const* greet() {
return "hello, world";
}
#include <boost/python.hpp>
BOOST_PYTHON_MODULE(hello_ext)
{
using namespace boost::python;
def("greet", greet);
}
I can compile the example like this, although it takes a while. 我可以像这样编译示例,尽管需要一些时间。
$ clang++ -fPIC -c -I/usr/include/python2.7 hello_ext.cpp
However, when I attempt to link it and produce an so
I get a bunch of undefined symbols: 但是,当我尝试将其链接并产生a时
so
我得到了一堆未定义的符号:
$ clang++ -shared -o hello_ext.so hello_ext.o | & head -n 7
Undefined symbols for architecture x86_64:
"_PyString_Type", referenced from:
boost::python::to_python_value<char const* const&>::get_pytype() const in hello_ext.o
"__Py_NoneStruct", referenced from:
boost::python::api::object::object() in hello_ext.o
"boost::python::detail::init_module(char const*, void (*)())", referenced from:
_inithello_ext in hello_ext.o
Some of them clearly come from the Python interpreter, and indeed -lpython
solves some of the unresolved symbol errors: 其中一些显然来自Python解释器,实际上
-lpython
解决了一些未解决的符号错误:
$ clang++ -shared -o hello_ext.so hello_ext.o -lpython | & head -n 7
Undefined symbols for architecture x86_64:
"boost::python::detail::init_module(char const*, void (*)())", referenced from:
_inithello_ext in hello_ext.o
"boost::python::detail::gcc_demangle(char const*)", referenced from:
boost::python::type_info::name() const in hello_ext.o
"boost::python::detail::scope_setattr_doc(char const*, boost::python::api::object const&, char const*)", referenced from:
void boost::python::def<char const* (*)()>(char const*, char const* (*)()) in hello_ext.o
The documentation here for boost::python
goes into some detail about how to use the library in conjunction with cmake
, but doesn't say much about what libraries are required at link time. 这里的
boost::python
文档详细介绍了如何将库与cmake
结合使用,但并没有过多说明链接时需要哪些库。
boost::python
is not a header-only library, it includes a binary component. boost::python
不是仅标头的库,它包含一个二进制组件。 You need to link with it, for example 您需要与之链接,例如
clang++ ... -I/usr/include/python2.7 -lboost_python -lpython2.7
The library is apparently installed by the homebrew package boost-python
, not boost
. 该库显然是由Homebrew软件包
boost-python
安装的,而不是boost
。
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