added check for Nan

diff --git a/lang/cem/libcc.ansi/headers/math.h b/lang/cem/libcc.ansi/headers/math.h
index a63b713..69af582 100644 (file)
--- a/lang/cem/libcc.ansi/headers/math.h
+++ b/lang/cem/libcc.ansi/headers/math.h
@@ -9,6 +9,8 @@
 double __huge_val(void);       /* may be infinity */
 #define        HUGE_VAL        (__huge_val())
 
+int    __IsNan(double d);      /* test for Not A Number */
+
 double acos(double _x);
 double asin(double _x);
 double atan(double _x);