From 39330d6b79c95f67006453156d8405242da04d7b Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 6 Apr 2016 01:17:55 +0000
Subject: lgamma_r.c: fix at -0.0

* math.c (ruby_lgamma_r): missing/lgamma_r.c is used on Windows,
  since msvcrt does not provide it.
* missing/lgamma_r.c (lgamma_r): fix lgamma(-0.0).
  [ruby-core:74823] [Bug #12249]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54496 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 missing/lgamma_r.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'missing/lgamma_r.c')

diff --git a/missing/lgamma_r.c b/missing/lgamma_r.c
index 6d2f38f40c..01066d2930 100644
--- a/missing/lgamma_r.c
+++ b/missing/lgamma_r.c
@@ -66,7 +66,7 @@ lgamma_r(double x, int *signp)
         double i, f, s;
         f = modf(-x, &i);
         if (f == 0.0) { /* pole error */
-            *signp = 1;
+            *signp = signbit(x) ? -1 : 1;
             errno = ERANGE;
             return HUGE_VAL;
         }
-- 
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