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 #define MOZ_IS_GCC 0 13 #define MOZ_IS_MSVC 0 14 15 #if !defined(__clang__) && defined(__GNUC__) 16 17 #undef MOZ_IS_GCC 18 #define MOZ_IS_GCC 1 19 /* 20 * These macros should simplify gcc version checking. For example, to check 21 * for gcc 4.7.1 or later, check `#if MOZ_GCC_VERSION_AT_LEAST(4, 7, 1)`. 22 */ 23 #define MOZ_GCC_VERSION_AT_LEAST(major, minor, patchlevel) \ 24 ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= \ 25 ((major)*10000 + (minor)*100 + (patchlevel))) 26 #define MOZ_GCC_VERSION_AT_MOST(major, minor, patchlevel) \ 27 ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) <= \ 28 ((major)*10000 + (minor)*100 + (patchlevel))) 29 #if !MOZ_GCC_VERSION_AT_LEAST(4, 9, 0) 30 #error "mfbt (and Gecko) require at least gcc 4.9 to build." 31 #endif 32 33 #elif defined(_MSC_VER) 34 35 #undef MOZ_IS_MSVC 36 #define MOZ_IS_MSVC 1 37 38 #endif 39 40 /* 41 * The situation with standard libraries is a lot worse than with compilers, 42 * particularly as clang and gcc could end up using one of three or so standard 43 * libraries, and they may not be up-to-snuff with newer C++11 versions. To 44 * detect the library, we're going to include cstddef (which is a small header 45 * which will be transitively included by everybody else at some point) to grab 46 * the version macros and deduce macros from there. 47 */ 48 #ifdef __cplusplus 49 #include <cstddef> 50 #ifdef _STLPORT_MAJOR 51 #define MOZ_USING_STLPORT 1 52 #define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) \ 53 (_STLPORT_VERSION >= ((major) << 8 | (minor) << 4 | (patch))) 54 #elif defined(_LIBCPP_VERSION) 55 /* 56 * libc++, unfortunately, doesn't appear to have useful versioning macros. 57 * Hopefully, the recommendations of N3694 with respect to standard libraries 58 * will get applied instead and we won't need to worry about version numbers 59 * here. 60 */ 61 #define MOZ_USING_LIBCXX 1 62 #elif defined(__GLIBCXX__) 63 #define MOZ_USING_LIBSTDCXX 1 64 /* 65 * libstdc++ is also annoying and doesn't give us useful versioning macros 66 * for the library. If we're using gcc, then assume that libstdc++ matches 67 * the compiler version. If we're using clang, we're going to have to fake 68 * major/minor combinations by looking for newly-defined config macros. 69 */ 70 #if MOZ_IS_GCC 71 #define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ 72 MOZ_GCC_VERSION_AT_LEAST(major, minor, patch) 73 #elif defined(_GLIBCXX_THROW_OR_ABORT) 74 #define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ 75 ((major) < 4 || ((major) == 4 && (minor) <= 8)) 76 #elif defined(_GLIBCXX_NOEXCEPT) 77 #define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ 78 ((major) < 4 || ((major) == 4 && (minor) <= 7)) 79 #elif defined(_GLIBCXX_USE_DEPRECATED) 80 #define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ 81 ((major) < 4 || ((major) == 4 && (minor) <= 6)) 82 #elif defined(_GLIBCXX_PSEUDO_VISIBILITY) 83 #define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ 84 ((major) < 4 || ((major) == 4 && (minor) <= 5)) 85 #elif defined(_GLIBCXX_BEGIN_EXTERN_C) 86 #define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ 87 ((major) < 4 || ((major) == 4 && (minor) <= 4)) 88 #elif defined(_GLIBCXX_VISIBILITY_ATTR) 89 #define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ 90 ((major) < 4 || ((major) == 4 && (minor) <= 3)) 91 #elif defined(_GLIBCXX_VISIBILITY) 92 #define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \ 93 ((major) < 4 || ((major) == 4 && (minor) <= 2)) 94 #else 95 #error "Your version of libstdc++ is unknown to us and is likely too old." 96 #endif 97 #endif 98 99 // Flesh out the defines for everyone else 100 #ifndef MOZ_USING_STLPORT 101 #define MOZ_USING_STLPORT 0 102 #define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) 0 103 #endif 104 #ifndef MOZ_USING_LIBCXX 105 #define MOZ_USING_LIBCXX 0 106 #endif 107 #ifndef MOZ_USING_LIBSTDCXX 108 #define MOZ_USING_LIBSTDCXX 0 109 #define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) 0 110 #endif 111 #endif /* __cplusplus */ 112 113 #endif /* mozilla_Compiler_h */ 114