Compile with VS2015.

include/core/SkFloatingPoint.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkFloatingPoint_DEFINED
@@ skipping 20 matching lines @@
 
 static inline float sk_float_copysign(float x, float y) {
 // c++11 contains a 'float copysign(float, float)' function in <cmath>.
 // clang-cl reports __cplusplus for clang, not the __cplusplus vc++ version _MSC_VER would report.
 #if (defined(_MSC_VER) && defined(__clang__))
 #    define SK_BUILD_WITH_CLANG_CL 1
 #else
 #    define SK_BUILD_WITH_CLANG_CL 0
 #endif
 #if (!SK_BUILD_WITH_CLANG_CL && __cplusplus >= 201103L) || (_MSC_VER >= 1800)
-    return copysign(x, y);
+    return copysignf(x, y);
 
 // Posix has demanded 'float copysignf(float, float)' (from C99) since Issue 6.
 #elif defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L
     return copysignf(x, y);
 
 // Visual studio prior to 13 only has 'double _copysign(double, double)'.
 #elif defined(_MSC_VER)
     return (float)_copysign(x, y);
 
 // Otherwise convert to bits and extract sign.
@@ skipping 125 matching lines @@
     float estimate = *SkTCast<float*>(&i);
 
     // One step of Newton's method to refine.
     const float estimate_sq = estimate*estimate;
     estimate *= (1.5f-0.5f*x*estimate_sq);
     return estimate;
 #endif
 }
 
 #endif