gh-93202: Always use %zd printf formatter (#93201)

Python now always use the ``%zu`` and ``%zd`` printf formats to
format a size_t or Py_ssize_t number. Building Python 3.12 requires a
C11 compiler, so these printf formats are now always supported.

* PyObject_Print() and _PyObject_Dump() now use the printf %zd format
  to display an object reference count.
* Update PY_FORMAT_SIZE_T comment.
* Remove outdated notes about the %zd format in PyBytes_FromFormat()
  and PyUnicode_FromFormat() documentations.
* configure no longer checks for the %zd format and no longer defines
  PY_FORMAT_SIZE_T macro in pyconfig.h.
* pymacconfig.h no longer undefines PY_FORMAT_SIZE_T: macOS 10.4 is
  no longer supported. Python 3.12 now requires macOS 10.6 (Snow
  Leopard) or newer.

1 files changed, 2 insertions, 7 deletions

diff --git a/Objects/object.c b/Objects/object.c
index 95045ed..49b1cba 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -274,11 +274,8 @@ PyObject_Print(PyObject *op, FILE *fp, int flags)
     }
     else {
         if (Py_REFCNT(op) <= 0) {
-            /* XXX(twouters) cast refcount to long until %zd is
-               universally available */
             Py_BEGIN_ALLOW_THREADS
-            fprintf(fp, "<refcnt %ld at %p>",
-                (long)Py_REFCNT(op), (void *)op);
+            fprintf(fp, "<refcnt %zd at %p>", Py_REFCNT(op), (void *)op);
             Py_END_ALLOW_THREADS
         }
         else {
@@ -371,9 +368,7 @@ _PyObject_Dump(PyObject* op)
 
     /* first, write fields which are the least likely to crash */
     fprintf(stderr, "object address  : %p\n", (void *)op);
-    /* XXX(twouters) cast refcount to long until %zd is
-       universally available */
-    fprintf(stderr, "object refcount : %ld\n", (long)Py_REFCNT(op));
+    fprintf(stderr, "object refcount : %zd\n", Py_REFCNT(op));
     fflush(stderr);
 
     PyTypeObject *type = Py_TYPE(op);