1 /* Define __GLIBC_FLT_EVAL_METHOD. 2 Copyright (C) 2016-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _MATH_H 20 # error "Never use <bits/flt-eval-method.h> directly; include <math.h> instead." 21 #endif 22 23 /* __GLIBC_FLT_EVAL_METHOD is the value of FLT_EVAL_METHOD used to 24 determine the evaluation method typedefs such as float_t and 25 double_t. It must be a value from C11 or TS 18661-3:2015, and not 26 -1. */ 27 28 /* In the default version of this header, follow __FLT_EVAL_METHOD__. 29 -1 is mapped to 2 (considering evaluation as long double to be a 30 conservatively safe assumption), and if __FLT_EVAL_METHOD__ is not 31 defined then assume there is no excess precision and use the value 32 0. */ 33 34 #ifdef __FLT_EVAL_METHOD__ 35 # if __FLT_EVAL_METHOD__ == -1 36 # define __GLIBC_FLT_EVAL_METHOD 2 37 # else 38 # define __GLIBC_FLT_EVAL_METHOD __FLT_EVAL_METHOD__ 39 # endif 40 #else 41 # define __GLIBC_FLT_EVAL_METHOD 0 42 #endif 43