gecko-dev/mfbt/Compiler.h

/* -*- 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 */