From 4270dbe629600ac7ab72da3fecd13ba7af234a51 Mon Sep 17 00:00:00 2001
From: yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 31 Jul 2011 14:17:40 +0000
Subject: Forward-ports r32777 from branches/ruby_1_9_3 to trunk. -- *
 complex.c (f_signbit): gcc4 on Solaris DOES have signbit but does   not have
 it on header.

* math.c: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32786 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 complex.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'complex.c')

diff --git a/complex.c b/complex.c
index 78f0902a83..a21249681f 100644
--- a/complex.c
+++ b/complex.c
@@ -1173,6 +1173,9 @@ nucomp_eql_p(VALUE self, VALUE other)
 inline static VALUE
 f_signbit(VALUE x)
 {
+#if defined(HAVE_SIGNBIT) && defined(__GNUC__) && defined(__sun__)
+    extern int signbit(double x);
+#endif
     switch (TYPE(x)) {
       case T_FLOAT: {
 	double f = RFLOAT_VALUE(x);
-- 
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