1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mfbt/Compiler.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,105 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +/* Various compiler checks. */
1.11 +
1.12 +#ifndef mozilla_Compiler_h
1.13 +#define mozilla_Compiler_h
1.14 +
1.15 +#if !defined(__clang__) && defined(__GNUC__)
1.16 +
1.17 +# define MOZ_IS_GCC 1
1.18 + /*
1.19 + * This macro should simplify gcc version checking. For example, to check
1.20 + * for gcc 4.5.1 or later, check `#if MOZ_GCC_VERSION_AT_LEAST(4, 5, 1)`.
1.21 + */
1.22 +# define MOZ_GCC_VERSION_AT_LEAST(major, minor, patchlevel) \
1.23 + ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) \
1.24 + >= ((major) * 10000 + (minor) * 100 + (patchlevel)))
1.25 +# if !MOZ_GCC_VERSION_AT_LEAST(4, 4, 0)
1.26 +# error "mfbt (and Gecko) require at least gcc 4.4 to build."
1.27 +# endif
1.28 +
1.29 +#else
1.30 +
1.31 +# define MOZ_IS_GCC 0
1.32 +
1.33 +#endif
1.34 +
1.35 +/*
1.36 + * The situation with standard libraries is a lot worse than with compilers,
1.37 + * particularly as clang and gcc could end up using one of three or so standard
1.38 + * libraries, and they may not be up-to-snuff with newer C++11 versions. To
1.39 + * detect the library, we're going to include cstddef (which is a small header
1.40 + * which will be transitively included by everybody else at some point) to grab
1.41 + * the version macros and deduce macros from there.
1.42 + */
1.43 +#ifdef __cplusplus
1.44 +# include <cstddef>
1.45 +# ifdef _STLPORT_MAJOR
1.46 +# define MOZ_USING_STLPORT 1
1.47 +# define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) \
1.48 + (_STLPORT_VERSION >= ((major) << 8 | (minor) << 4 | (patch)))
1.49 +# elif defined(_LIBCPP_VERSION)
1.50 + /*
1.51 + * libc++, unfortunately, doesn't appear to have useful versioning macros.
1.52 + * Hopefully, the recommendations of N3694 with respect to standard libraries
1.53 + * will get applied instead and we won't need to worry about version numbers
1.54 + * here.
1.55 + */
1.56 +# define MOZ_USING_LIBCXX 1
1.57 +# elif defined(__GLIBCXX__)
1.58 +# define MOZ_USING_LIBSTDCXX 1
1.59 + /*
1.60 + * libstdc++ is also annoying and doesn't give us useful versioning macros
1.61 + * for the library. If we're using gcc, then assume that libstdc++ matches
1.62 + * the compiler version. If we're using clang, we're going to have to fake
1.63 + * major/minor combinations by looking for newly-defined config macros.
1.64 + */
1.65 +# if MOZ_IS_GCC
1.66 +# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
1.67 + MOZ_GCC_VERSION_AT_LEAST(major, minor, patch)
1.68 +# elif defined(_GLIBCXX_THROW_OR_ABORT)
1.69 +# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
1.70 + ((major) < 4 || ((major) == 4 && (minor) <= 8))
1.71 +# elif defined(_GLIBCXX_NOEXCEPT)
1.72 +# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
1.73 + ((major) < 4 || ((major) == 4 && (minor) <= 7))
1.74 +# elif defined(_GLIBCXX_USE_DEPRECATED)
1.75 +# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
1.76 + ((major) < 4 || ((major) == 4 && (minor) <= 6))
1.77 +# elif defined(_GLIBCXX_PSEUDO_VISIBILITY)
1.78 +# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
1.79 + ((major) < 4 || ((major) == 4 && (minor) <= 5))
1.80 +# elif defined(_GLIBCXX_BEGIN_EXTERN_C)
1.81 +# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
1.82 + ((major) < 4 || ((major) == 4 && (minor) <= 4))
1.83 +# elif defined(_GLIBCXX_VISIBILITY_ATTR)
1.84 +# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
1.85 + ((major) < 4 || ((major) == 4 && (minor) <= 3))
1.86 +# elif defined(_GLIBCXX_VISIBILITY)
1.87 +# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
1.88 + ((major) < 4 || ((major) == 4 && (minor) <= 2))
1.89 +# else
1.90 +# error "Your version of libstdc++ is unknown to us and is likely too old."
1.91 +# endif
1.92 +# endif
1.93 +
1.94 + // Flesh out the defines for everyone else
1.95 +# ifndef MOZ_USING_STLPORT
1.96 +# define MOZ_USING_STLPORT 0
1.97 +# define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) 0
1.98 +# endif
1.99 +# ifndef MOZ_USING_LIBCXX
1.100 +# define MOZ_USING_LIBCXX 0
1.101 +# endif
1.102 +# ifndef MOZ_USING_LIBSTDCXX
1.103 +# define MOZ_USING_LIBSTDCXX 0
1.104 +# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) 0
1.105 +# endif
1.106 +#endif /* __cplusplus */
1.107 +
1.108 +#endif /* mozilla_Compiler_h */
