| 1 | /**************************************************************************
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| 2 | *
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| 3 | * Copyright 2007-2013 VMware, Inc.
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| 4 | * All Rights Reserved.
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| 5 | *
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a
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| 7 | * copy of this software and associated documentation files (the
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| 8 | * "Software"), to deal in the Software without restriction, including
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| 9 | * without limitation the rights to use, copy, modify, merge, publish,
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| 10 | * distribute, sub license, and/or sell copies of the Software, and to
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| 11 | * permit persons to whom the Software is furnished to do so, subject to
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| 12 | * the following conditions:
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| 13 | *
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| 14 | * The above copyright notice and this permission notice (including the
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| 15 | * next paragraph) shall be included in all copies or substantial portions
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| 16 | * of the Software.
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| 17 | *
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| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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| 19 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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| 20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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| 21 | * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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| 22 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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| 23 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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| 24 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| 25 | *
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| 26 | **************************************************************************/
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| 27 |
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| 28 | #include "no_extern_c.h"
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| 29 |
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| 30 | #ifndef _C99_COMPAT_H_
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| 31 | #define _C99_COMPAT_H_
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| 32 |
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| 33 |
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| 34 | /*
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| 35 | * MSVC hacks.
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| 36 | */
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| 37 | #if defined(_MSC_VER)
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| 38 |
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| 39 | # if _MSC_VER < 1900
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| 40 | # error "Microsoft Visual Studio 2015 or higher required"
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| 41 | # endif
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| 42 |
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| 43 | /*
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| 44 | * XXX: MSVC has a `__restrict` keyword, but it also has a
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| 45 | * `__declspec(restrict)` modifier, so it is impossible to define a
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| 46 | * `restrict` macro without interfering with the latter. Furthermore the
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| 47 | * MSVC standard library uses __declspec(restrict) under the _CRTRESTRICT
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| 48 | * macro. For now resolve this issue by redefining _CRTRESTRICT, but going
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| 49 | * forward we should probably should stop using restrict, especially
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| 50 | * considering that our code does not obbey strict aliasing rules any way.
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| 51 | */
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| 52 | # ifndef IPRT_NO_CRT
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| 53 | # include <crtdefs.h>
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| 54 | # undef _CRTRESTRICT
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| 55 | # define _CRTRESTRICT
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| 56 | # endif
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| 57 | #endif
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| 58 |
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| 59 |
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| 60 | /*
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| 61 | * C99 restrict keyword
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| 62 | *
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| 63 | * See also:
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| 64 | * - http://cellperformance.beyond3d.com/articles/2006/05/demystifying-the-restrict-keyword.html
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| 65 | */
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| 66 | #ifndef restrict
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| 67 | # ifndef __cplusplus
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| 68 | /* Use C99 restrict keyword */
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| 69 | # elif defined(__GNUC__)
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| 70 | # define restrict __restrict__
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| 71 | # elif defined(_MSC_VER)
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| 72 | # define restrict __restrict
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| 73 | # else
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| 74 | # define restrict /* */
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| 75 | # endif
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| 76 | #endif
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| 77 |
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| 78 |
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| 79 | /* Simple test case for debugging */
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| 80 | #if 0
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| 81 | static inline const char *
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| 82 | test_c99_compat_h(const void * restrict a,
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| 83 | const void * restrict b)
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| 84 | {
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| 85 | return __func__;
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| 86 | }
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| 87 | #endif
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| 88 |
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| 89 |
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| 90 | #endif /* _C99_COMPAT_H_ */
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