gh-108765: Python.h no longer includes <ieeefp.h>

Author: vstinner

Doc/whatsnew/3.13.rst

@@ -915,6 +915,11 @@ New Features
 Porting to Python 3.13
 ----------------------
 
+* ``Python.h`` no longer includes the ``<ieeefp.h>`` standard header. It was
+  included for the ``finite()`` function which is now provided by the
+  ``<math.h>`` header. It should now be included explicitly if needed.
+  (Contributed by Victor Stinner in :gh:`108765`.)
+
 Deprecated
 ----------
 

Include/Python.h

@@ -33,6 +33,7 @@
 #endif
 
 #include <assert.h>               // assert()
+#include <math.h>                 // HUGE_VAL
 #include <wchar.h>                // wchar_t
 
 #include "pyport.h"

Include/pyport.h

@@ -189,12 +189,6 @@ typedef Py_ssize_t Py_ssize_clean_t;
 #  define Py_MEMCPY memcpy
 #endif
 
-#ifdef HAVE_IEEEFP_H
-#include <ieeefp.h>  /* needed for 'finite' declaration on some platforms */
-#endif
-
-#include <math.h> /* Moved here from the math section, before extern "C" */
-
 /********************************************
  * WRAPPER FOR <time.h> and/or <sys/time.h> *
  ********************************************/

Misc/NEWS.d/next/C API/2023-09-01-20-41-49.gh-issue-108765.5dXc1r.rst

@@ -0,0 +1,4 @@
+``Python.h`` no longer includes the ``<ieeefp.h>`` standard header. It was
+included for the ``finite()`` function which is now provided by the
+``<math.h>`` header. It should now be included explicitly if needed. Patch
+by Victor Stinner.