[Python-checkins] bpo-45434: Only exclude <stdlib.h> in Python 3.11 limited C API (GH-29027)
vstinner
webhook-mailer at python.org
Tue Oct 19 06:10:27 EDT 2021
https://github.com/python/cpython/commit/52af0756b2ffc6788e364971d05cdaf127d77d5a
commit: 52af0756b2ffc6788e364971d05cdaf127d77d5a
branch: main
author: Victor Stinner <vstinner at python.org>
committer: vstinner <vstinner at python.org>
date: 2021-10-19T12:10:22+02:00
summary:
bpo-45434: Only exclude <stdlib.h> in Python 3.11 limited C API (GH-29027)
The Python 3.11 limited C API no longer includes stdlib.h, stdio.h,
string.h and errno.h.
* Exclude Py_MEMCPY() from Python 3.11 limited C API.
* xxlimited C extension is now built with Python 3.11 limited C API.
files:
D Misc/NEWS.d/next/C API/2021-10-15-00-30-45.bpo-45434.XLtsbK.rst
M Doc/whatsnew/3.11.rst
M Include/Python.h
M Include/pyport.h
M Misc/NEWS.d/next/C API/2021-10-11-23-03-49.bpo-45434.tsS8I_.rst
M Modules/xxlimited.c
diff --git a/Doc/whatsnew/3.11.rst b/Doc/whatsnew/3.11.rst
index 0776265779849..2e57f0cea53db 100644
--- a/Doc/whatsnew/3.11.rst
+++ b/Doc/whatsnew/3.11.rst
@@ -564,18 +564,10 @@ Porting to Python 3.11
(Contributed by Victor Stinner in :issue:`39573`.)
-* The ``<Python.h>`` header file no longer includes ``<stdlib.h>``. C
- extensions using ``<stdlib.h>`` must now include it explicitly.
- The system ``<stdlib.h>`` header provides functions like:
- ``malloc()``/``free()``, ``getenv()``, ``strtol()``, ``abs()``, ``strtol()``,
- ``exit()`` and ``abort()``.
- (Contributed by Victor Stinner in :issue:`45434`.)
-
-* The ``<Python.h>`` header file no longer includes ``<stdio.h>`` if the
- ``Py_LIMITED_API`` macro is defined. Functions expecting ``FILE*`` are
- excluded from the limited C API (:pep:`384`). C extensions using
- ``<stdio.h>`` must now include it explicitly. The system ``<stdio.h>``
- header provides functions like ``printf()`` and ``fopen()``.
+* ``<Python.h>`` no longer includes the header files ``<stdlib.h>``,
+ ``<stdio.h>``, ``<errno.h>`` and ``<string.h>`` when the ``Py_LIMITED_API``
+ macro is set to ``0x030b0000`` (Python 3.11) or higher. C extensions should
+ explicitly include the header files after ``#include <Python.h>``.
(Contributed by Victor Stinner in :issue:`45434`.)
* The non-limited API files ``cellobject.h``, ``classobject.h``, ``context.h``,
diff --git a/Include/Python.h b/Include/Python.h
index c0a621ad44afd..6e3303ac9a3b0 100644
--- a/Include/Python.h
+++ b/Include/Python.h
@@ -16,12 +16,14 @@
# define _SGI_MP_SOURCE
#endif
-#include <string.h> // memcpy()
-#ifndef Py_LIMITED_API
+// stdlib.h, stdio.h, errno.h and string.h headers are not used by Python
+// headers, but kept for backward compatibility. They are excluded from the
+// limited C API of Python 3.11.
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
+# include <stdlib.h>
# include <stdio.h> // FILE*
-#endif
-#ifdef HAVE_ERRNO_H
# include <errno.h> // errno
+# include <string.h> // memcpy()
#endif
#ifndef MS_WINDOWS
# include <unistd.h>
diff --git a/Include/pyport.h b/Include/pyport.h
index 0bec2a9b38f7c..61ca3a97c186b 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -201,9 +201,10 @@ typedef Py_ssize_t Py_ssize_clean_t;
# define Py_LOCAL_INLINE(type) static inline type
#endif
-/* Py_MEMCPY is kept for backwards compatibility,
- * see https://bugs.python.org/issue28126 */
-#define Py_MEMCPY memcpy
+// bpo-28126: Py_MEMCPY is kept for backwards compatibility,
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
+# define Py_MEMCPY memcpy
+#endif
#ifdef HAVE_IEEEFP_H
#include <ieeefp.h> /* needed for 'finite' declaration on some platforms */
diff --git a/Misc/NEWS.d/next/C API/2021-10-11-23-03-49.bpo-45434.tsS8I_.rst b/Misc/NEWS.d/next/C API/2021-10-11-23-03-49.bpo-45434.tsS8I_.rst
index 95c5f0d1150c8..627f687272f5a 100644
--- a/Misc/NEWS.d/next/C API/2021-10-11-23-03-49.bpo-45434.tsS8I_.rst
+++ b/Misc/NEWS.d/next/C API/2021-10-11-23-03-49.bpo-45434.tsS8I_.rst
@@ -1,6 +1,5 @@
-The ``<Python.h>`` header file no longer includes ``<stdlib.h>``. C
-extensions using ``<stdlib.h>`` must now include it explicitly.
-The system ``<stdlib.h>`` header provides functions like:
-``malloc()``/``free()``, ``getenv()``, ``strtol()``, ``abs()``, ``strtol()``,
-``exit()`` and ``abort()``.
+``<Python.h>`` no longer includes the header files ``<stdlib.h>``,
+``<stdio.h>``, ``<errno.h>`` and ``<string.h>`` when the ``Py_LIMITED_API``
+macro is set to ``0x030b0000`` (Python 3.11) or higher. C extensions should
+explicitly include the header files after ``#include <Python.h>``.
Patch by Victor Stinner.
diff --git a/Misc/NEWS.d/next/C API/2021-10-15-00-30-45.bpo-45434.XLtsbK.rst b/Misc/NEWS.d/next/C API/2021-10-15-00-30-45.bpo-45434.XLtsbK.rst
deleted file mode 100644
index 4a06635d179d9..0000000000000
--- a/Misc/NEWS.d/next/C API/2021-10-15-00-30-45.bpo-45434.XLtsbK.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-The ``<Python.h>`` header file no longer includes ``<stdio.h>`` if the
-``Py_LIMITED_API`` macro is defined. Functions expecting ``FILE*`` are excluded
-from the limited C API (:pep:`384`). C extensions using ``<stdio.h>`` must now
-include it explicitly.
-Patch by Victor Stinner.
diff --git a/Modules/xxlimited.c b/Modules/xxlimited.c
index 9bd9a5407d43c..93895c4f1214c 100644
--- a/Modules/xxlimited.c
+++ b/Modules/xxlimited.c
@@ -1,4 +1,3 @@
-
/* Use this file as a template to start implementing a module that
also declares object types. All occurrences of 'Xxo' should be changed
to something reasonable for your objects. After that, all other
@@ -55,7 +54,7 @@
pass
*/
-#define Py_LIMITED_API 0x030a0000
+#define Py_LIMITED_API 0x030b0000
#include "Python.h"
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