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-rw-r--r--ChangeLog6
-rw-r--r--math.c3
2 files changed, 9 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index a670627..6220122 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Aug 27 15:24:20 2010 NAKAMURA Usaku <usa@ruby-lang.org>
+
+ * math.c (math_atan2): you should know that M_PI is not the feature
+ of C90.
+ fixed build failure caused by r29115.
+
Fri Aug 27 15:26:33 2010 Nobuyoshi Nakada <nobu@ruby-lang.org>
* file.c (null_device): move from io.c.
diff --git a/math.c b/math.c
index 5461763..e3a78f7 100644
--- a/math.c
+++ b/math.c
@@ -51,6 +51,9 @@ extern VALUE rb_to_float(VALUE val);
static VALUE
math_atan2(VALUE obj, VALUE y, VALUE x)
{
+#ifndef M_PI
+# define M_PI 3.14159265358979323846
+#endif
double dx, dy;
Need_Float2(y, x);
dx = RFLOAT_VALUE(x);