Add const to several API functions that take char *.
In C++, it's an error to pass a string literal to a char* function
without a const_cast(). Rather than require every C++ extension
module to put a cast around string literals, fix the API to state the
const-ness.
I focused on parts of the API where people usually pass literals:
PyArg_ParseTuple() and friends, Py_BuildValue(), PyMethodDef, the type
slots, etc. Predictably, there were a large set of functions that
needed to be fixed as a result of these changes. The most pervasive
change was to make the keyword args list passed to
PyArg_ParseTupleAndKewords() to be a const char *kwlist[].
One cast was required as a result of the changes: A type object
mallocs the memory for its tp_doc slot and later frees it.
PyTypeObject says that tp_doc is const char *; but if the type was
created by type_new(), we know it is safe to cast to char *.
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index be46c8d..50c7863 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -1907,7 +1907,7 @@
{
PyObject *newlist, *v, *seq, *compare=NULL, *keyfunc=NULL, *newargs;
PyObject *callable;
- static char *kwlist[] = {"iterable", "cmp", "key", "reverse", 0};
+ static const char *kwlist[] = {"iterable", "cmp", "key", "reverse", 0};
long reverse;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|OOi:sorted",