1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // Code on Windows expects to be able to do: 10 // 11 // #define _USE_MATH_DEFINES 12 // #include <math.h> 13 // 14 // and receive the definitions of mathematical constants, even if <math.h> 15 // has previously been included. Make sure that works. 16 // 17 18 #ifdef _MSC_VER 19 # include <math.h> 20 # define _USE_MATH_DEFINES 21 # include <math.h> 22 23 # ifndef M_PI 24 # error M_PI not defined 25 # endif 26 #endif 27