mfbt/Compiler.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /* Various compiler checks. */
   7
   8 #ifndef mozilla_Compiler_h_
   9 #define mozilla_Compiler_h_
  10
  11 #if !defined(__clang__) && defined(__GNUC__)
  12
  13 #define MOZ_IS_GCC 1
  14    /*
  15     * This macro should simplify gcc version checking. For example, to check
  16     * for gcc 4.5.1 or later, check `#ifdef MOZ_GCC_VERSION_AT_LEAST(4, 5, 1)`.
  17     */
  18 #  define MOZ_GCC_VERSION_AT_LEAST(major, minor, patchlevel)          \
  19      ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) \
  20       >= ((major) * 10000 + (minor) * 100 + (patchlevel)))
  21 #if !MOZ_GCC_VERSION_AT_LEAST(4, 4, 0)
  22 #  error "mfbt (and Gecko) require at least gcc 4.4 to build."
  23 #endif
  24
  25 #else
  26
  27 #define MOZ_IS_GCC 0
  28
  29 #endif
  30
  31 #endif  /* mozilla_Compiler_h_ */