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The following code segfaults on platforms where HAVE_USABLE_WCHAR_T is
not defined (for example: narrow unicode build and sizeof(wchar_t)==4)
>>> from ctypes import *
>>> import ctypes.util
>>> CDLL(ctypes.util.find_library('c')).wcslen(u'text')
(it works if the argtypes member is defined)
The reason is a non initialized structure, and the correction is trivial:
--- Modules/_ctypes/callproc.c~ 2007年06月15日 19:10:41.000000000 +0200
+++ Modules/_ctypes/callproc.c 2009年02月10日 13:28:10.000000000 +0100
@@ -538,6 +538,7 @@
 int size = PyUnicode_GET_SIZE(obj);
 size += 1; /* terminating NUL */
 size *= sizeof(wchar_t);
+ pa->ffi_type = &ffi_type_pointer;
 pa->value.p = PyMem_Malloc(size);
 if (!pa->value.p) {
 PyErr_NoMemory();