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gh-108765: Python.h no longer includes <stddef.h> on Windows #111563

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Merged
vstinner merged 1 commit into from
Oct 31, 2023
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gh-108765: Python.h no longer includes <stddef.h> on Windows #111563

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8 changes: 8 additions & 0 deletions Doc/whatsnew/3.13.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1186,6 +1186,14 @@ Porting to Python 3.13
``PyUnicode_AsUTF8AndSize(unicode, NULL)`` can be used instead.
(Contributed by Victor Stinner in :gh:`111089`.)

* On Windows, ``Python.h`` no longer includes the ``<stddef.h>`` standard
header file. If needed, it should now be included explicitly. For example, it
provides ``offsetof()`` function, and ``size_t`` and ``ptrdiff_t`` types.
Including ``<stddef.h>`` explicitly was already needed by all other
platforms, the ``HAVE_STDDEF_H`` macro is only defined on Windows.
(Contributed by Victor Stinner in :gh:`108765`.)


Deprecated
----------

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3 changes: 0 additions & 3 deletions Include/Python.h
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Expand Up @@ -22,9 +22,6 @@
#include <math.h> // HUGE_VAL
#include <stdarg.h> // va_list
#include <wchar.h> // wchar_t
#ifdef HAVE_STDDEF_H
# include <stddef.h> // size_t
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h> // ssize_t
#endif
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/C API/2023-10-31-18-22-03.gh-issue-108765._beYv8.rst
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@@ -0,0 +1,3 @@
On Windows, ``Python.h`` no longer includes the ``<stddef.h>`` standard
header file. If needed, it should now be included explicitly. Patch by
Victor Stinner.