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