Replace math.h with cmath

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index c0213d2ea477ab78ec7a77c4404e7a09ea4e8429..1615a2a96b24a08d1ba4efdc4b4a982f243bb1a2 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -65,6 +65,12 @@
 #include "v8threads.h"
 #include "vm-state-inl.h"
 
+#ifndef _STLP_VENDOR_CSTD
+// STLPort doesn't import fpclassify and isless into the std namespace.
+using std::fpclassify;
+using std::isless;
+#endif
+
 namespace v8 {
 namespace internal {
 
@@ -3963,10 +3969,10 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberToRadixString) {
 
   // Slow case.
   CONVERT_DOUBLE_ARG_CHECKED(value, 0);
-  if (isnan(value)) {
+  if (std::isnan(value)) {
     return *isolate->factory()->nan_string();
   }
-  if (isinf(value)) {
+  if (std::isinf(value)) {
     if (value < 0) {
       return *isolate->factory()->minus_infinity_string();
     }
@@ -6604,8 +6610,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberEquals) {
 
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
   CONVERT_DOUBLE_ARG_CHECKED(y, 1);
-  if (isnan(x)) return Smi::FromInt(NOT_EQUAL);
-  if (isnan(y)) return Smi::FromInt(NOT_EQUAL);
+  if (std::isnan(x)) return Smi::FromInt(NOT_EQUAL);
+  if (std::isnan(y)) return Smi::FromInt(NOT_EQUAL);
   if (x == y) return Smi::FromInt(EQUAL);
   Object* result;
   if ((fpclassify(x) == FP_ZERO) && (fpclassify(y) == FP_ZERO)) {
@@ -6641,7 +6647,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_NumberCompare) {
 
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
   CONVERT_DOUBLE_ARG_CHECKED(y, 1);
-  if (isnan(x) || isnan(y)) return args[2];
+  if (std::isnan(x) || std::isnan(y)) return args[2];
   if (x == y) return Smi::FromInt(EQUAL);
   if (isless(x, y)) return Smi::FromInt(LESS);
   return Smi::FromInt(GREATER);
@@ -6864,7 +6870,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_atan2) {
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
   CONVERT_DOUBLE_ARG_CHECKED(y, 1);
   double result;
-  if (isinf(x) && isinf(y)) {
+  if (std::isinf(x) && std::isinf(y)) {
     // Make sure that the result in case of two infinite arguments
     // is a multiple of Pi / 4. The sign of the result is determined
     // by the first argument (x) and the sign of the second argument
@@ -6947,7 +6953,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_pow) {
 
   CONVERT_DOUBLE_ARG_CHECKED(y, 1);
   double result = power_helper(x, y);
-  if (isnan(result)) return isolate->heap()->nan_value();
+  if (std::isnan(result)) return isolate->heap()->nan_value();
   return isolate->heap()->AllocateHeapNumber(result);
 }
 
@@ -6964,7 +6970,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_pow_cfunction) {
     return Smi::FromInt(1);
   } else {
     double result = power_double_double(x, y);
-    if (isnan(result)) return isolate->heap()->nan_value();
+    if (std::isnan(result)) return isolate->heap()->nan_value();
     return isolate->heap()->AllocateHeapNumber(result);
   }
 }
@@ -7066,7 +7072,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DateSetValue) {
 
   Object* value = NULL;
   bool is_value_nan = false;
-  if (isnan(time)) {
+  if (std::isnan(time)) {
     value = isolate->heap()->nan_value();
     is_value_nan = true;
   } else if (!is_utc &&