Split <math.h> out of <cmath>.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@249742 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/depr/depr.c.headers/math_h_isinf.pass.cpp

@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <math.h>
+
+// isinf
+
+// XFAIL: linux
+
+#include <math.h>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#ifdef isinf
+#error isinf defined
+#endif
+    static_assert((std::is_same<decltype(isinf((float)0)), bool>::value), "");
+    static_assert((std::is_same<decltype(isinf((double)0)), bool>::value), "");
+    static_assert((std::is_same<decltype(isinf(0)), bool>::value), "");
+    static_assert((std::is_same<decltype(isinf((long double)0)), bool>::value), "");
+    assert(isinf(-1.0) == false);
+}

test/std/depr/depr.c.headers/math_h_isnan.pass.cpp

@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <math.h>
+
+// isnan
+
+// XFAIL: linux
+
+#include <math.h>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#ifdef isnan
+#error isnan defined
+#endif
+    static_assert((std::is_same<decltype(isnan((float)0)), bool>::value), "");
+    static_assert((std::is_same<decltype(isnan((double)0)), bool>::value), "");
+    static_assert((std::is_same<decltype(isnan(0)), bool>::value), "");
+    static_assert((std::is_same<decltype(isnan((long double)0)), bool>::value), "");
+    assert(isnan(-1.0) == false);
+}