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+/* Define __GLIBC_FLT_EVAL_METHOD.
+ Copyright (C) 2016-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _MATH_H
+# error "Never use <bits/flt-eval-method.h> directly; include <math.h> instead."
+#endif
+
+/* __GLIBC_FLT_EVAL_METHOD is the value of FLT_EVAL_METHOD used to
+ determine the evaluation method typedefs such as float_t and
+ double_t. It must be a value from C11 or TS 18661-3:2015, and not
+ -1. */
+
+/* In the default version of this header, follow __FLT_EVAL_METHOD__.
+ -1 is mapped to 2 (considering evaluation as long double to be a
+ conservatively safe assumption), and if __FLT_EVAL_METHOD__ is not
+ defined then assume there is no excess precision and use the value
+ 0. */
+
+#ifdef __FLT_EVAL_METHOD__
+# if __FLT_EVAL_METHOD__ == -1
+# define __GLIBC_FLT_EVAL_METHOD 2
+# else
+# define __GLIBC_FLT_EVAL_METHOD __FLT_EVAL_METHOD__
+# endif
+#else
+# define __GLIBC_FLT_EVAL_METHOD 0
+#endif