* math.c (math_log, math_log10): should return NaN if x < 0.0

  on Cygwin.


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@1236 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 5 insertions, 0 deletions

diff --git a/math.c b/math.c
index a676abf45..9b28ddbf6 100644
--- a/math.c
+++ b/math.c
@@ -64,6 +64,11 @@ math_exp(obj, x)
     return rb_float_new(exp(RFLOAT(x)->value));
 }
 
+#if defined __CYGWIN__
+#define log(x) ((x) < 0.0 ? 0.0 / 0.0 : log(x))
+#define log10(x) ((x) < 0.0 ? 0.0 / 0.0 : log10(x))
+#endif
+
 static VALUE
 math_log(obj, x)
     VALUE obj, x;