mirror of
https://github.com/mozilla/gecko-dev.git
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106 lines
4.2 KiB
C
106 lines
4.2 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Various compiler checks. */
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#ifndef mozilla_Compiler_h
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#define mozilla_Compiler_h
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#if !defined(__clang__) && defined(__GNUC__)
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#define MOZ_IS_GCC 1
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/*
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* This macro should simplify gcc version checking. For example, to check
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* for gcc 4.5.1 or later, check `#ifdef MOZ_GCC_VERSION_AT_LEAST(4, 5, 1)`.
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*/
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# define MOZ_GCC_VERSION_AT_LEAST(major, minor, patchlevel) \
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((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) \
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>= ((major) * 10000 + (minor) * 100 + (patchlevel)))
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#if !MOZ_GCC_VERSION_AT_LEAST(4, 4, 0)
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# error "mfbt (and Gecko) require at least gcc 4.4 to build."
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#endif
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#else
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#define MOZ_IS_GCC 0
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#endif
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/*
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* The situation with standard libraries is a lot worse than with compilers,
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* particularly as clang and gcc could end up using one of three or so standard
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* libraries, and they may not be up-to-snuff with newer C++11 versions. To
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* detect the library, we're going to include cstddef (which is a small header
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* which will be transitively included by everybody else at some point) to grab
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* the version macros and deduce macros from there.
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*/
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#ifdef __cplusplus
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# include <cstddef>
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# ifdef _STLPORT_MAJOR
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# define MOZ_USING_STLPORT 1
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# define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) \
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(_STLPORT_VERSION >= ((major) << 8 | (minor) << 4 | (patch)))
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# elif defined(_LIBCPP_VERSION)
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/*
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* libc++, unfortunately, doesn't appear to have useful versioning macros.
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* Hopefully, the recommendations of N3694 with respect to standard libraries
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* will get applied instead and we won't need to worry about version numbers
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* here.
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*/
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# define MOZ_USING_LIBCXX 1
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# elif defined(__GLIBCXX__)
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# define MOZ_USING_LIBSTDCXX 1
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/*
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* libstdc++ is also annoying and doesn't give us useful versioning macros
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* for the library. If we're using gcc, then assume that libstdc++ matches
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* the compiler version. If we're using clang, we're going to have to fake
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* major/minor combinations by looking for newly-defined config macros.
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*/
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# if MOZ_IS_GCC
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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MOZ_GCC_VERSION_AT_LEAST(major, minor, patch)
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# elif defined(_GLIBCXX_THROW_OR_ABORT)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 8))
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# elif defined(_GLIBCXX_NOEXCEPT)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 7))
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# elif defined(_GLIBCXX_USE_DEPRECATED)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 6))
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# elif defined(_GLIBCXX_PSEUDO_VISIBILITY)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 5))
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# elif defined(_GLIBCXX_BEGIN_EXTERN_C)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 4))
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# elif defined(_GLIBCXX_VISIBILITY_ATTR)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 3))
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# elif defined(_GLIBCXX_VISIBILITY)
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
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((major) < 4 || ((major) == 4 && (minor) <= 2))
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# else
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# error "Your version of libstdc++ is unknown to us and is likely too old."
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# endif
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# endif
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// Flesh out the defines for everyone else
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# ifndef MOZ_USING_STLPORT
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# define MOZ_USING_STLPORT 0
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# define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) 0
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# endif
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# ifndef MOZ_USING_LIBCXX
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# define MOZ_USING_LIBCXX 0
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# endif
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# ifndef MOZ_USING_LIBSTDCXX
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# define MOZ_USING_LIBSTDCXX 0
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# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) 0
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# endif
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#endif /* __cplusplus */
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#endif /* mozilla_Compiler_h */
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