mfbt/Compiler.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* Various compiler checks. */
   8
   9 #ifndef mozilla_Compiler_h
  10 #define mozilla_Compiler_h
  11
  12 #define MOZ_IS_GCC 0
  13
  14 #if !defined(__clang__) && defined(__GNUC__)
  15
  16 #  undef MOZ_IS_GCC
  17 #  define MOZ_IS_GCC 1
  18 /*
  19  * These macros should simplify gcc version checking. For example, to check
  20  * for gcc 4.7.1 or later, check `#if MOZ_GCC_VERSION_AT_LEAST(4, 7, 1)`.
  21  */
  22 #  define MOZ_GCC_VERSION_AT_LEAST(major, minor, patchlevel)            \
  23     ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= \
  24      ((major) * 10000 + (minor) * 100 + (patchlevel)))
  25 #  define MOZ_GCC_VERSION_AT_MOST(major, minor, patchlevel)             \
  26     ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) <= \
  27      ((major) * 10000 + (minor) * 100 + (patchlevel)))
  28 #  if !MOZ_GCC_VERSION_AT_LEAST(6, 1, 0)
  29 #    error "mfbt (and Gecko) require at least gcc 6.1 to build."
  30 #  endif
  31
  32 #endif
  33
  34 #endif /* mozilla_Compiler_h */