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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /mfbt/Compiler.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Various compiler checks. */
+
+#ifndef mozilla_Compiler_h
+#define mozilla_Compiler_h
+
+#define MOZ_IS_GCC 0
+#define MOZ_IS_MSVC 0
+
+#if !defined(__clang__) && defined(__GNUC__)
+
+# undef MOZ_IS_GCC
+# define MOZ_IS_GCC 1
+ /*
+ * These macros should simplify gcc version checking. For example, to check
+ * for gcc 4.7.1 or later, check `#if MOZ_GCC_VERSION_AT_LEAST(4, 7, 1)`.
+ */
+# define MOZ_GCC_VERSION_AT_LEAST(major, minor, patchlevel) \
+ ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) \
+ >= ((major) * 10000 + (minor) * 100 + (patchlevel)))
+# define MOZ_GCC_VERSION_AT_MOST(major, minor, patchlevel) \
+ ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) \
+ <= ((major) * 10000 + (minor) * 100 + (patchlevel)))
+# if !MOZ_GCC_VERSION_AT_LEAST(4, 8, 0)
+# error "mfbt (and Gecko) require at least gcc 4.8 to build."
+# endif
+
+#elif defined(_MSC_VER)
+
+# undef MOZ_IS_MSVC
+# define MOZ_IS_MSVC 1
+
+#endif
+
+/*
+ * The situation with standard libraries is a lot worse than with compilers,
+ * particularly as clang and gcc could end up using one of three or so standard
+ * libraries, and they may not be up-to-snuff with newer C++11 versions. To
+ * detect the library, we're going to include cstddef (which is a small header
+ * which will be transitively included by everybody else at some point) to grab
+ * the version macros and deduce macros from there.
+ */
+#ifdef __cplusplus
+# include <cstddef>
+# ifdef _STLPORT_MAJOR
+# define MOZ_USING_STLPORT 1
+# define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) \
+ (_STLPORT_VERSION >= ((major) << 8 | (minor) << 4 | (patch)))
+# elif defined(_LIBCPP_VERSION)
+ /*
+ * libc++, unfortunately, doesn't appear to have useful versioning macros.
+ * Hopefully, the recommendations of N3694 with respect to standard libraries
+ * will get applied instead and we won't need to worry about version numbers
+ * here.
+ */
+# define MOZ_USING_LIBCXX 1
+# elif defined(__GLIBCXX__)
+# define MOZ_USING_LIBSTDCXX 1
+ /*
+ * libstdc++ is also annoying and doesn't give us useful versioning macros
+ * for the library. If we're using gcc, then assume that libstdc++ matches
+ * the compiler version. If we're using clang, we're going to have to fake
+ * major/minor combinations by looking for newly-defined config macros.
+ */
+# if MOZ_IS_GCC
+# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
+ MOZ_GCC_VERSION_AT_LEAST(major, minor, patch)
+# elif defined(_GLIBCXX_THROW_OR_ABORT)
+# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
+ ((major) < 4 || ((major) == 4 && (minor) <= 8))
+# elif defined(_GLIBCXX_NOEXCEPT)
+# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
+ ((major) < 4 || ((major) == 4 && (minor) <= 7))
+# elif defined(_GLIBCXX_USE_DEPRECATED)
+# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
+ ((major) < 4 || ((major) == 4 && (minor) <= 6))
+# elif defined(_GLIBCXX_PSEUDO_VISIBILITY)
+# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
+ ((major) < 4 || ((major) == 4 && (minor) <= 5))
+# elif defined(_GLIBCXX_BEGIN_EXTERN_C)
+# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
+ ((major) < 4 || ((major) == 4 && (minor) <= 4))
+# elif defined(_GLIBCXX_VISIBILITY_ATTR)
+# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
+ ((major) < 4 || ((major) == 4 && (minor) <= 3))
+# elif defined(_GLIBCXX_VISIBILITY)
+# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) \
+ ((major) < 4 || ((major) == 4 && (minor) <= 2))
+# else
+# error "Your version of libstdc++ is unknown to us and is likely too old."
+# endif
+# endif
+
+ // Flesh out the defines for everyone else
+# ifndef MOZ_USING_STLPORT
+# define MOZ_USING_STLPORT 0
+# define MOZ_STLPORT_VERSION_AT_LEAST(major, minor, patch) 0
+# endif
+# ifndef MOZ_USING_LIBCXX
+# define MOZ_USING_LIBCXX 0
+# endif
+# ifndef MOZ_USING_LIBSTDCXX
+# define MOZ_USING_LIBSTDCXX 0
+# define MOZ_LIBSTDCXX_VERSION_AT_LEAST(major, minor, patch) 0
+# endif
+#endif /* __cplusplus */
+
+#endif /* mozilla_Compiler_h */