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bpo-45440: Require math.h isinf() to build (GH-28894)

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Building Python now requires a C99 <math.h> header file providing
isinf(), isnan() and isfinite() functions.

Remove the Py_FORCE_DOUBLE() macro. It was used by the
Py_IS_INFINITY() macro.

Changes:

* Remove Py_IS_NAN(), Py_IS_INFINITY() and Py_IS_FINITE()
  in PC/pyconfig.h.
* Remove the _Py_force_double() function.
* configure no longer checks if math.h defines isinf(), isnan() and
  isfinite().
This commit is contained in:
Victor Stinner 2021-10-13 23:27:50 +02:00 • committed by GitHub
parent aac29af678
commit 194a9526d8
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10 changed files with 25 additions and 143 deletions
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13
PC/pyconfig.h
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@ -189,11 +189,6 @@ typedef _W64 int Py_ssize_t;
typedef int pid_t;
#include <float.h>
#define Py_IS_NAN _isnan
#define Py_IS_INFINITY(X) (!_finite(X) && !_isnan(X))
#define Py_IS_FINITE(X) _finite(X)
/* define some ANSI types that are not defined in earlier Win headers */
#if _MSC_VER >= 1200
/* This file only exists in VC 6.0 or higher */
@ -358,15 +353,9 @@ Py_NO_ENABLE_SHARED to find out. Also support MS_NO_COREDLL for b/w compat */
/* Define to 1 if you have the `round' function. */
#if _MSC_VER >= 1800
#define HAVE_ROUND 1
# define HAVE_ROUND 1
#endif
/* Define to 1 if you have the `isinf' macro. */
#define HAVE_DECL_ISINF 1
/* Define to 1 if you have the `isnan' function. */
#define HAVE_DECL_ISNAN 1
/* Define if on AIX 3.
System headers sometimes define this.
We just want to avoid a redefinition error message. */