* ext/bigdecimal/bigdecimal.c (isfinite): isfinite does not always

exist.  fixed build error on Windows itroduced at r55123.

I found that more complex definition of isfinite in numeric.c.
But it's unused because it inplicitly checks not defined _WIN32.
I don't know why the code do that.
IMO, the definition of isfinite should be put at missing.h.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55129 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon May 23 15:52:07 2016  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* ext/bigdecimal/bigdecimal.c (isfinite): isfinite does not always
+	  exist.  fixed build error on Windows itroduced at r55123.
+
 Mon May 23 13:19:41 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (rb_scan_args0): make compile error if the

ext/bigdecimal/bigdecimal.c

@@ -30,6 +30,10 @@
 #include <ieeefp.h>
 #endif
 
+#if !defined(HAVE_ISFINITE) && defined(HAVE_FINITE)
+# define isfinite(x) finite(x)
+#endif
+
 /* #define ENABLE_NUMERIC_STRING */
 
 #define MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, min, max) ( \