Vendoring libc++ in external/

external/include/c++/v1/tgmath.h

@@ -0,0 +1,37 @@
+// -*- C++ -*-
+//===-------------------------- tgmath.h ----------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_TGMATH_H
+#define _LIBCPP_TGMATH_H
+
+/*
+    tgmath.h synopsis
+
+#include <ctgmath>
+
+*/
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+#ifdef __cplusplus
+
+#include <ctgmath>
+
+#else  // __cplusplus
+
+#include_next <tgmath.h>
+
+#endif  // __cplusplus
+
+#endif  // _LIBCPP_TGMATH_H