merges r21813 from trunk into ruby_1_9_1.

* math.c: SEGV is caused by implicit rb_to_float declaration
  	  test_complexrational.rb: [BUG] at IA-64 architecture

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1@21842 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/math.c b/math.c
index 63a386360..c7e79c1a8 100644
--- a/math.c
+++ b/math.c
@@ -15,6 +15,7 @@
 
 VALUE rb_mMath;
 
+extern VALUE rb_to_float(VALUE val);
 #define Need_Float(x) (x) = rb_to_float(x)
 #define Need_Float2(x,y) do {\
     Need_Float(x);\