Fix Python 3.10 C++ tests (#9128)

The first change is to make sure we always define PY_SSIZE_T_CLEAN
before including Python.h. Starting from Python 3.10 this is required.
Otherwise we get errors like this:

SystemError: PY_SSIZE_T_CLEAN macro must be defined for '#' formats

The second change is to update reflection_test.py to account for the
fact that with Python 3.10, we get a TypeError even with the C++
implementation when trying to assign a float to a bool field. I'm not
sure why this changed with Python 3.10, but it seems like a good thing
since this is the desired behavior anyway.

python/google/protobuf/internal/api_implementation.cc

@@ -28,6 +28,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 namespace google {

python/google/protobuf/internal/reflection_test.py

@@ -37,6 +37,7 @@ import copy
 import gc
 import operator
 import struct
+import sys
 import warnings
 import unittest
 
@@ -376,7 +377,8 @@ class ReflectionTest(unittest.TestCase):
     self.assertRaises(TypeError, setattr, proto, 'optional_float', 'foo')
     self.assertRaises(TypeError, setattr, proto, 'optional_double', 'foo')
     # TODO(jieluo): Fix type checking difference for python and c extension
-    if api_implementation.Type() == 'python':
+    if (api_implementation.Type() == 'python' or
+        (sys.version_info.major, sys.version_info.minor) >= (3, 10)):
       self.assertRaises(TypeError, setattr, proto, 'optional_bool', 1.1)
     else:
       proto.optional_bool = 1.1

python/google/protobuf/proto_api.h

@@ -45,6 +45,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_PROTO_API_H__
 #define GOOGLE_PROTOBUF_PYTHON_PROTO_API_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <google/protobuf/descriptor_database.h>

python/google/protobuf/pyext/descriptor.cc

@@ -32,6 +32,7 @@
 
 #include <google/protobuf/pyext/descriptor.h>
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include <frameobject.h>
 

python/google/protobuf/pyext/descriptor.h

@@ -33,6 +33,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <google/protobuf/descriptor.h>

python/google/protobuf/pyext/descriptor_containers.cc

@@ -49,6 +49,7 @@
 // because the Python API is based on C, and does not play well with C++
 // inheritance.
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <google/protobuf/descriptor.h>

python/google/protobuf/pyext/descriptor_containers.h

@@ -34,6 +34,7 @@
 // Mappings and Sequences of descriptors.
 // They implement containers like fields_by_name, EnumDescriptor.values...
 // See descriptor_containers.cc for more description.
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 namespace google {

python/google/protobuf/pyext/descriptor_database.h

@@ -31,6 +31,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_DATABASE_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_DATABASE_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <google/protobuf/descriptor_database.h>

python/google/protobuf/pyext/descriptor_pool.cc

@@ -32,6 +32,7 @@
 
 #include <unordered_map>
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <google/protobuf/descriptor.pb.h>

python/google/protobuf/pyext/descriptor_pool.h

@@ -31,6 +31,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_POOL_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_POOL_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <unordered_map>

python/google/protobuf/pyext/extension_dict.h

@@ -34,6 +34,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <memory>

python/google/protobuf/pyext/field.h

@@ -31,6 +31,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_FIELD_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_FIELD_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 namespace google {

python/google/protobuf/pyext/map_container.h

@@ -31,6 +31,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_MAP_CONTAINER_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_MAP_CONTAINER_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <cstdint>

python/google/protobuf/pyext/message.h

@@ -34,6 +34,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_MESSAGE_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_MESSAGE_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <cstdint>

python/google/protobuf/pyext/message_factory.cc

@@ -30,6 +30,7 @@
 
 #include <unordered_map>
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <google/protobuf/dynamic_message.h>

python/google/protobuf/pyext/message_factory.h

@@ -31,6 +31,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_MESSAGE_FACTORY_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_MESSAGE_FACTORY_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <unordered_map>

python/google/protobuf/pyext/message_module.cc

@@ -28,6 +28,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <google/protobuf/message_lite.h>

python/google/protobuf/pyext/repeated_composite_container.h

@@ -34,6 +34,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_REPEATED_COMPOSITE_CONTAINER_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_REPEATED_COMPOSITE_CONTAINER_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <memory>

python/google/protobuf/pyext/repeated_scalar_container.h

@@ -34,6 +34,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_REPEATED_SCALAR_CONTAINER_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_REPEATED_SCALAR_CONTAINER_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <memory>

python/google/protobuf/pyext/scoped_pyobject_ptr.h

@@ -35,6 +35,7 @@
 
 #include <google/protobuf/stubs/common.h>
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 namespace google {
 namespace protobuf {

python/google/protobuf/pyext/unknown_fields.cc

@@ -30,6 +30,7 @@
 
 #include <google/protobuf/pyext/unknown_fields.h>
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include <set>
 #include <memory>

python/google/protobuf/pyext/unknown_fields.h

@@ -31,6 +31,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_CPP_UNKNOWN_FIELDS_H__
 #define GOOGLE_PROTOBUF_PYTHON_CPP_UNKNOWN_FIELDS_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 #include <memory>

python/google/protobuf/python_protobuf.h

@@ -36,6 +36,7 @@
 #ifndef GOOGLE_PROTOBUF_PYTHON_PYTHON_PROTOBUF_H__
 #define GOOGLE_PROTOBUF_PYTHON_PYTHON_PROTOBUF_H__
 
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
 namespace google {