diff contrib/python-zstandard/c-ext/bufferutil.c @ 46374:e92ca942ddca

cext: add Python 3.10 support

* Replace "Py_TYPE(obj) = type;" with "Py_SET_TYPE(obj, type);"
* Add pythoncapi_compat.h header file to get Py_SET_TYPE() on Python
  2.7-3.8. Header file added to mercurial/ and
  contrib/python-zstandard/zstd/common/.

In Python 3.10, Py_TYPE(obj) must not longer be used as an l-value.

pythoncapi_compat.h comes from:
https://github.com/pythoncapi/pythoncapi_compat

Differential Revision: https://phab.mercurial-scm.org/D9825

--- a/contrib/python-zstandard/c-ext/bufferutil.c	Wed Jan 20 14:47:13 2021 +0100
+++ b/contrib/python-zstandard/c-ext/bufferutil.c	Mon Dec 14 10:44:29 2020 +0100
@@ -758,7 +758,7 @@
 };
 
 void bufferutil_module_init(PyObject* mod) {
-	Py_TYPE(&ZstdBufferWithSegmentsType) = &PyType_Type;
+	Py_SET_TYPE(&ZstdBufferWithSegmentsType, &PyType_Type);
 	if (PyType_Ready(&ZstdBufferWithSegmentsType) < 0) {
 		return;
 	}
@@ -766,7 +766,7 @@
 	Py_INCREF(&ZstdBufferWithSegmentsType);
 	PyModule_AddObject(mod, "BufferWithSegments", (PyObject*)&ZstdBufferWithSegmentsType);
 
-	Py_TYPE(&ZstdBufferSegmentsType) = &PyType_Type;
+	Py_SET_TYPE(&ZstdBufferSegmentsType, &PyType_Type);
 	if (PyType_Ready(&ZstdBufferSegmentsType) < 0) {
 		return;
 	}
@@ -774,7 +774,7 @@
 	Py_INCREF(&ZstdBufferSegmentsType);
 	PyModule_AddObject(mod, "BufferSegments", (PyObject*)&ZstdBufferSegmentsType);
 
-	Py_TYPE(&ZstdBufferSegmentType) = &PyType_Type;
+	Py_SET_TYPE(&ZstdBufferSegmentType, &PyType_Type);
 	if (PyType_Ready(&ZstdBufferSegmentType) < 0) {
 		return;
 	}
@@ -782,7 +782,7 @@
 	Py_INCREF(&ZstdBufferSegmentType);
 	PyModule_AddObject(mod, "BufferSegment", (PyObject*)&ZstdBufferSegmentType);
 
-	Py_TYPE(&ZstdBufferWithSegmentsCollectionType) = &PyType_Type;
+	Py_SET_TYPE(&ZstdBufferWithSegmentsCollectionType, &PyType_Type);
 	if (PyType_Ready(&ZstdBufferWithSegmentsCollectionType) < 0) {
 		return;
 	}