27 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// Code on Windows expects to be able to do:10//11// #define _USE_MATH_DEFINES12// #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_VER19# include <math.h>20# define _USE_MATH_DEFINES21# include <math.h>22 23# ifndef M_PI24# error M_PI not defined25# endif26#endif27