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comparison: mfbt/Compiler.h
mfbt/Compiler.h
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 /* Various compiler checks. */ | |
| 8 | |
| 9 #ifndef mozilla_Compiler_h | |
| 10 #define mozilla_Compiler_h | |
| 11 | |
| 12 #if !defined(__clang__) && defined(__GNUC__) | |
| 13 | |
| 14 # define MOZ_IS_GCC 1 | |
| 15 /* | |
| 16 * This macro should simplify gcc version checking. For example, to check | |
| 17 * for gcc 4.5.1 or later, check `#if MOZ_GCC_VERSION_AT_LEAST(4, 5, 1)`. | |
| 18 */ | |
| 19 # define MOZ_GCC_VERSION_AT_LEAST(major, minor, patchlevel) \ | |
| 20 ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) \ | |
| 21 >= ((major) * 10000 + (minor) * 100 + (patchlevel))) | |
| 22 # if !MOZ_GCC_VERSION_AT_LEAST(4, 4, 0) | |
| 23 # error "mfbt (and Gecko) require at least gcc 4.4 to build." | |
| 24 # endif | |
| 25 | |
| 26 #else | |
| 27 | |
| 28 # define MOZ_IS_GCC 0 | |
| 29 | |
| 30 #endif | |
| 31 | |
| 32 /* | |
| 33 * The situation with standard libraries is a lot worse than with compilers, | |
| 34 * particularly as clang and gcc could end up using one of three or so standard | |
| 35 * libraries, and they may not be up-to-snuff with newer C++11 versions. To | |
| 36 * detect the library, we're going to include cstddef (which is a small header | |
| 37 * which will be transitively included by everybody else at some point) to grab | |
| 38 * the version macros and deduce macros from there. | |
| 39 */ | |
| 40 #ifdef __cplusplus | |
| 41 # include <cstddef> | |
| 42 # ifdef _STLPORT_MAJOR | |
| 43 # define MOZ_USING_STLPORT 1 | |
| 44 # define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) \ | |
| 45 (_STLPORT_VERSION >= ((major) << 8 | (minor) << 4 | (patch))) | |
| 46 # elif defined(_LIBCPP_VERSION) | |
| 47 /* | |
| 48 * libc++, unfortunately, doesn't appear to have useful versioning macros. | |
| 49 * Hopefully, the recommendations of N3694 with respect to standard libraries | |
| 50 * will get applied instead and we won't need to worry about version numbers | |
| 51 * here. | |
| 52 */ | |
| 53 # define MOZ_USING_LIBCXX 1 | |
| 54 # elif defined(__GLIBCXX__) | |
| 55 # define MOZ_USING_LIBSTDCXX 1 | |
| 56 /* | |
| 57 * libstdc++ is also annoying and doesn't give us useful versioning macros | |
| 58 * for the library. If we're using gcc, then assume that libstdc++ matches | |
| 59 * the compiler version. If we're using clang, we're going to have to fake | |
| 60 * major/minor combinations by looking for newly-defined config macros. | |
| 61 */ | |
| 62 # if MOZ_IS_GCC | |
| 63 # define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ | |
| 64 MOZ_GCC_VERSION_AT_LEAST(major, minor, patch) | |
| 65 # elif defined(_GLIBCXX_THROW_OR_ABORT) | |
| 66 # define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ | |
| 67 ((major) < 4 || ((major) == 4 && (minor) <= 8)) | |
| 68 # elif defined(_GLIBCXX_NOEXCEPT) | |
| 69 # define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ | |
| 70 ((major) < 4 || ((major) == 4 && (minor) <= 7)) | |
| 71 # elif defined(_GLIBCXX_USE_DEPRECATED) | |
| 72 # define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ | |
| 73 ((major) < 4 || ((major) == 4 && (minor) <= 6)) | |
| 74 # elif defined(_GLIBCXX_PSEUDO_VISIBILITY) | |
| 75 # define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ | |
| 76 ((major) < 4 || ((major) == 4 && (minor) <= 5)) | |
| 77 # elif defined(_GLIBCXX_BEGIN_EXTERN_C) | |
| 78 # define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ | |
| 79 ((major) < 4 || ((major) == 4 && (minor) <= 4)) | |
| 80 # elif defined(_GLIBCXX_VISIBILITY_ATTR) | |
| 81 # define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ | |
| 82 ((major) < 4 || ((major) == 4 && (minor) <= 3)) | |
| 83 # elif defined(_GLIBCXX_VISIBILITY) | |
| 84 # define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ | |
| 85 ((major) < 4 || ((major) == 4 && (minor) <= 2)) | |
| 86 # else | |
| 87 # error "Your version of libstdc++ is unknown to us and is likely too old." | |
| 88 # endif | |
| 89 # endif | |
| 90 | |
| 91 // Flesh out the defines for everyone else | |
| 92 # ifndef MOZ_USING_STLPORT | |
| 93 # define MOZ_USING_STLPORT 0 | |
| 94 # define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) 0 | |
| 95 # endif | |
| 96 # ifndef MOZ_USING_LIBCXX | |
| 97 # define MOZ_USING_LIBCXX 0 | |
| 98 # endif | |
| 99 # ifndef MOZ_USING_LIBSTDCXX | |
| 100 # define MOZ_USING_LIBSTDCXX 0 | |
| 101 # define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) 0 | |
| 102 # endif | |
| 103 #endif /* __cplusplus */ | |
| 104 | |
| 105 #endif /* mozilla_Compiler_h */ |
