Add the flag RTLD_GLOBAL to the dlopen() options.

This exports symbols defined by the loaded extension to other
extensions (loaded later).

(I'm not quite sure about this but suppose it can't hurt...)

Python/importdl.c

@@ -171,6 +171,9 @@ typedef void (*dl_funcptr)();
 #ifndef RTLD_LAZY
 #define RTLD_LAZY 1
 #endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
 #define SHORT_EXT ".so"
 #define LONG_EXT "module.so"
 #endif /* USE_SHLIB */
@@ -362,12 +365,13 @@ _PyImport_LoadDynamicModule(name, pathname, fp)
 #ifdef RTLD_NOW
 		/* RTLD_NOW: resolve externals now
 		   (i.e. core dump now if some are missing) */
-		void *handle = dlopen(pathname, RTLD_NOW);
+		void *handle = dlopen(pathname, RTLD_NOW | RTLD_GLOBAL);
 #else
 		void *handle;
 		if (Py_VerboseFlag)
-			printf("dlopen(\"%s\", %d);\n", pathname, RTLD_LAZY);
-		handle = dlopen(pathname, RTLD_LAZY);
+			printf("dlopen(\"%s\", %d);\n", pathname,
+			       RTLD_LAZY | RTLD_GLOBAL);
+		handle = dlopen(pathname, RTLD_LAZY | RTLD_GLOBAL);
 #endif /* RTLD_NOW */
 		if (handle == NULL) {
 			PyErr_SetString(PyExc_ImportError, dlerror());