Problem with Cython, extern "C" and unresolved external symbol

[Walter White]

Hello,

thanks Robert for answering my previous questions on the public stuct.

Now this works fine, but there are other problems now.

#pyximport uses parameter language='c++'

I have a header.h file like

---
int Test1(int input);

extern "C" {
	_declspec(dllexport) int Test1_C(int input)
	{
		return Test1(input);
	}
}

--

The cython pyx code is like:

cdef extern from "header.h":

    cdef int Test1(int input)
    cdef int Test1_C(int input)
  
--
Now when I am trying to run my Python code I get the
following error message:
error LNK2019: unresolved external symbol "int __cdecl Test1(int)"
(?Test1@@YAHH@Z) referenced in function Test1_C


These are things that might cause the problem but I could not solve it:

I am not sure if this related to what is mentioned here:
http://docs.cython.org/src/userguide/wrapping_CPlusPlus.html#access-to-c-only-functions

Is it?

The cpp-file states "using namespace std".
Does this mean I have to use
cdef extern from "header.h" namespace "std" ?

I am using pyximport with the following pyxbld file:

---
def make_ext(modname, pyxfilename):

    return Extension(name=modname,

    sources=[pyxfilename],

    include_dirs = include_dirs,

    library_dirs = library_dirs,

    language='c++')

---

Any help is very much appreciated!

Joe