LibM: Add NAN macro

Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/8a94813007e
Pull-request: https://github.com/SerenityOS/serenity/pull/2496

Libraries/LibJS/Runtime/Value.h

@@ -32,6 +32,7 @@
 #include <AK/Types.h>
 #include <LibJS/Forward.h>
 #include <LibJS/Runtime/Symbol.h>
+#include <math.h>
 
 // 2 ** 53 - 1
 static constexpr double MAX_ARRAY_LIKE_INDEX = 9007199254740991.0;
@@ -251,7 +252,7 @@ inline Value js_null()
 
 inline Value js_nan()
 {
-    return Value(__builtin_nan(""));
+    return Value(NAN);
 }
 
 inline Value js_infinity()

Libraries/LibM/math.cpp

@@ -211,7 +211,7 @@ double log10(double x)
 double log(double x)
 {
     if (x < 0)
-        return __builtin_nan("");
+        return NAN;
     if (x == 0)
         return -__builtin_huge_val();
     double y = 1 + 2 * (x - 1) / (x + 1);
@@ -321,7 +321,7 @@ double atan(double x)
 double asin(double x)
 {
     if (x > 1 || x < -1)
-        return __builtin_nan("");
+        return NAN;
     if (x > 0.5 || x < -0.5)
         return 2 * atan(x / (1 + sqrt(1 - x * x)));
     double squared = x * x;

Libraries/LibM/math.h

@@ -31,6 +31,7 @@
 __BEGIN_DECLS
 
 #define HUGE_VAL 1e10000
+#define NAN __builtin_nan("")
 #define M_E 2.718281828459045
 #define M_PI 3.141592653589793
 #define M_PI_2 (M_PI / 2)