From 406ae7fb03640e11e200382ef61cd450b952b7aa Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@jeremyevans.net>
Date: Wed, 28 Apr 2021 13:35:22 -0700
Subject: Fix Math.cbrt(0.0) on glibc

This should return 0, but on glibc it returned NaN.

Fixes [Bug #17804]
---
 math.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'math.c')

diff --git a/math.c b/math.c
index 470979c424..3b72149feb 100644
--- a/math.c
+++ b/math.c
@@ -703,7 +703,7 @@ math_cbrt(VALUE unused_obj, VALUE x)
     double f = Get_Double(x);
     double r = cbrt(f);
 #if defined __GLIBC__
-    if (isfinite(r)) {
+    if (isfinite(r) && !(f == 0.0 && r == 0.0)) {
 	r = (2.0 * r + (f / r / r)) / 3.0;
     }
 #endif
-- 
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