From b03623227ed1264e3cac4e6bb4878d96b91aa484 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Thu, 7 Sep 2017 11:35:03 -0700
Subject: [3.6] fixes bpo-31373: fix undefined floating-point demotions
 (GH-3396) (#3424)

(cherry picked from commit a853a8ba7850381d49b284295dd6f0dc491dbe44)
---
 Python/getargs.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'Python/getargs.c')

diff --git a/Python/getargs.c b/Python/getargs.c
index 616c6eb107..8fb19f34ec 100644
--- a/Python/getargs.c
+++ b/Python/getargs.c
@@ -4,6 +4,7 @@
 #include "Python.h"
 
 #include <ctype.h>
+#include <float.h>
 
 
 #ifdef __cplusplus
@@ -810,6 +811,10 @@ convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
         double dval = PyFloat_AsDouble(arg);
         if (PyErr_Occurred())
             RETURN_ERR_OCCURRED;
+        else if (dval > FLT_MAX)
+            *p = (float)INFINITY;
+        else if (dval < -FLT_MAX)
+            *p = (float)-INFINITY;
         else
             *p = (float) dval;
         break;
-- 
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