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-rw-r--r--mfbt/Compiler.h34
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diff --git a/mfbt/Compiler.h b/mfbt/Compiler.h
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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
+
+#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(6, 1, 0)
+# error "mfbt (and Gecko) require at least gcc 6.1 to build."
+# endif
+
+#endif
+
+#endif /* mozilla_Compiler_h */