Do not expect a copysign function to be defined in <cmath> with clang-cl
clang-cl defines __cplusplus to 201103L, but it uses the runtime library
provided by MSVC, so the copysign function will not be available there.
BUG=skia:
R=reed@google.com
Author: ehsan.akhgari@gmail.com
Review URL: https://codereview.chromium.org/526813002
diff --git a/include/core/SkFloatingPoint.h b/include/core/SkFloatingPoint.h
index 5489bac..93d479c 100644
--- a/include/core/SkFloatingPoint.h
+++ b/include/core/SkFloatingPoint.h
@@ -31,7 +31,7 @@
static inline float sk_float_copysign(float x, float y) {
// c++11 contains a 'float copysign(float, float)' function in <cmath>.
-#if __cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1800)
+#if (!defined(_MSC_VER) && __cplusplus >= 201103L) || (defined(_MSC_VER) && _MSC_VER >= 1800)
return copysign(x, y);
// Posix has demanded 'float copysignf(float, float)' (from C99) since Issue 6.
