From 06d06b2c9e7c7d3780ec2b9fbb58949403e5790e Mon Sep 17 00:00:00 2001
From: Hiroshi Shirosaki <h.shirosaki@gmail.com>
Date: Tue, 24 Jul 2012 07:00:59 +0900
Subject: [PATCH] Fix broken pow() of mingw

We will use powl() instead of broken pow(). This workaround will fix
failures in test_bignum.rb, test_fixnum.rb and test_float.rb etc.
---
 include/ruby/win32.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/ruby/win32.h b/include/ruby/win32.h
index 5ec3d3d..a9986d1 100644
--- a/include/ruby/win32.h
+++ b/include/ruby/win32.h
@@ -764,4 +764,18 @@ uintptr_t rb_w32_asynchronize(asynchronous_func_t func, uintptr_t self, int argc
 }  /* extern "C" { */
 #endif
 
+#ifdef __MINGW64__
+/*
+ * Use powl() instead of broken pow() of x86_64-w64-mingw32.
+ * This workaround will fix test failures in test_bignum.rb,
+ * test_fixnum.rb and test_float.rb etc.
+ */
+static inline double
+fake_pow(double x, double y)
+{
+    return powl(x, y);
+}
+#define pow fake_pow
+#endif
+
 #endif /* RUBY_WIN32_H */
-- 
1.7.11.msysgit.1