Include/exports.h

#ifndef Py_EXPORTS_H
#define Py_EXPORTS_H

/* Declarations for symbol visibility.

  PyAPI_FUNC(type): Declares a public Python API function and return type
  PyAPI_DATA(type): Declares public Python data and its type
  PyMODINIT_FUNC:   A Python module init function.  If these functions are
                    inside the Python core, they are private to the core.
                    If in an extension module, it may be declared with
                    external linkage depending on the platform.
  PyMODEXPORT_FUNC: Like PyMODINIT_FUNC, but for a slots array

  As a number of platforms support/require "__declspec(dllimport/dllexport)",
  we support a HAVE_DECLSPEC_DLL macro to save duplication.
*/

/*
  All windows ports, except cygwin, are handled in PC/pyconfig.h.

  Cygwin is the only other autoconf platform requiring special
  linkage handling and it uses __declspec().
*/
#if defined(__CYGWIN__)
#       define HAVE_DECLSPEC_DLL
#endif

#if defined(_WIN32) || defined(__CYGWIN__)
    #if defined(Py_ENABLE_SHARED)
        #define Py_IMPORTED_SYMBOL __declspec(dllimport)
        #define Py_EXPORTED_SYMBOL __declspec(dllexport)
        #define Py_LOCAL_SYMBOL
    #else
        #define Py_IMPORTED_SYMBOL
        #define Py_EXPORTED_SYMBOL
        #define Py_LOCAL_SYMBOL
    #endif
    /* module init functions outside the core must be exported */
    #if defined(_PyEXPORTS_CORE)
        #define _PyINIT_EXPORTED_SYMBOL Py_EXPORTED_SYMBOL
    #else
        #define _PyINIT_EXPORTED_SYMBOL __declspec(dllexport)
    #endif
#else
/*
 * If we only ever used gcc >= 5, we could use __has_attribute(visibility)
 * as a cross-platform way to determine if visibility is supported. However,
 * we may still need to support gcc >= 4, as some Ubuntu LTS and Centos versions
 * have 4 < gcc < 5.
 */
    #if (defined(__GNUC__) && (__GNUC__ >= 4)) ||\
        (defined(__clang__) && _Py__has_attribute(visibility))
        #define Py_IMPORTED_SYMBOL __attribute__ ((visibility ("default")))
        #define Py_EXPORTED_SYMBOL __attribute__ ((visibility ("default")))
        #define Py_LOCAL_SYMBOL  __attribute__ ((visibility ("hidden")))
    #else
        #define Py_IMPORTED_SYMBOL
        #define Py_EXPORTED_SYMBOL
        #define Py_LOCAL_SYMBOL
    #endif
    #define _PyINIT_EXPORTED_SYMBOL Py_EXPORTED_SYMBOL
#endif

/* only get special linkage if built as shared or platform is Cygwin */
#if defined(Py_ENABLE_SHARED) || defined(__CYGWIN__)
#       if defined(HAVE_DECLSPEC_DLL)
#               if defined(_PyEXPORTS_CORE) && !defined(_PyEXPORTS_CORE_MODULE)
        /* module init functions inside the core need no external linkage */
        /* except for Cygwin to handle embedding */
#                       if !defined(__CYGWIN__)
#                               define _PyINIT_FUNC_DECLSPEC
#                       endif /* __CYGWIN__ */
#               else /* _PyEXPORTS_CORE */
        /* Building an extension module, or an embedded situation */
        /* public Python functions and data are imported */
        /* Under Cygwin, auto-import functions to prevent compilation */
        /* failures similar to those described at the bottom of 4.1: */
        /* http://docs.python.org/extending/windows.html#a-cookbook-approach */
#                       if !defined(__CYGWIN__)
#                               define PyAPI_FUNC(RTYPE) Py_IMPORTED_SYMBOL RTYPE
#                       endif /* !__CYGWIN__ */
#                       define PyAPI_DATA(RTYPE) extern Py_IMPORTED_SYMBOL RTYPE
#               endif /* _PyEXPORTS_CORE */
#       endif /* HAVE_DECLSPEC_DLL */
#endif /* Py_ENABLE_SHARED */

/* If no external linkage macros defined by now, create defaults */
#ifndef PyAPI_FUNC
#       define PyAPI_FUNC(RTYPE) Py_EXPORTED_SYMBOL RTYPE
#endif
#ifndef PyAPI_DATA
#       define PyAPI_DATA(RTYPE) extern Py_EXPORTED_SYMBOL RTYPE
#endif
#ifndef _PyINIT_FUNC_DECLSPEC
#       if defined(__cplusplus)
#               define _PyINIT_FUNC_DECLSPEC extern "C" _PyINIT_EXPORTED_SYMBOL
#       else /* __cplusplus */
#               define _PyINIT_FUNC_DECLSPEC _PyINIT_EXPORTED_SYMBOL
#       endif /* __cplusplus */
#endif

#ifndef PyMODINIT_FUNC
    #define PyMODINIT_FUNC _PyINIT_FUNC_DECLSPEC PyObject*
#endif
#ifndef PyMODEXPORT_FUNC
    #define PyMODEXPORT_FUNC _PyINIT_FUNC_DECLSPEC PySlot*
#endif

#endif /* Py_EXPORTS_H */