1 /************************************************************************** 2 * 3 * Copyright 2007-2013 VMware, Inc. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 #include "no_extern_c.h" 29 30 #ifndef _C99_COMPAT_H_ 31 #define _C99_COMPAT_H_ 32 33 34 /* 35 * MSVC hacks. 36 */ 37 #if defined(_MSC_VER) 38 39 # if _MSC_VER < 1900 40 # error "Microsoft Visual Studio 2015 or higher required" 41 # endif 42 43 /* 44 * XXX: MSVC has a `__restrict` keyword, but it also has a 45 * `__declspec(restrict)` modifier, so it is impossible to define a 46 * `restrict` macro without interfering with the latter. Furthermore the 47 * MSVC standard library uses __declspec(restrict) under the _CRTRESTRICT 48 * macro. For now resolve this issue by redefining _CRTRESTRICT, but going 49 * forward we should probably should stop using restrict, especially 50 * considering that our code does not obbey strict aliasing rules any way. 51 */ 52 # include <crtdefs.h> 53 # undef _CRTRESTRICT 54 # define _CRTRESTRICT 55 #endif 56 57 58 /* 59 * C99 restrict keyword 60 * 61 * See also: 62 * - http://cellperformance.beyond3d.com/articles/2006/05/demystifying-the-restrict-keyword.html 63 */ 64 #ifndef restrict 65 # ifndef __cplusplus 66 /* Use C99 restrict keyword */ 67 # elif defined(__GNUC__) 68 # define restrict __restrict__ 69 # elif defined(_MSC_VER) 70 # define restrict __restrict 71 # else 72 # define restrict /* */ 73 # endif 74 #endif 75 76 77 /* Simple test case for debugging */ 78 #if 0 79 static inline const char * 80 test_c99_compat_h(const void * restrict a, 81 const void * restrict b) 82 { 83 return __func__; 84 } 85 #endif 86 87 88 #endif /* _C99_COMPAT_H_ */ 89