mfbt/Unused.h
author Nathan Froyd <froydnj@mozilla.com>
Thu, 28 Jun 2018 09:04:41 -0400
changeset 479410 58e5f6f08c54a318e59cd5ef1482602e3a68ddf0
parent 413998 57b1aa6bfa2e43322cc2318916352a3fea19d19d
child 505383 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1451104 - part 1 - ensure compatible binutils for GCC; r=glandium GCC will pick up whatever `as` is first in PATH when trying to assemble files. It expects this `as` to have at least as many features as the `as` detected at configure time when GCC was originally built. We should ensure that GCC is always picking up an appropriate `as` by adding its base directory to the search path; otherwise, we get peculiar assembler errors.

/* -*- 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/. */

#ifndef mozilla_unused_h
#define mozilla_unused_h

#include "mozilla/Attributes.h"
#include "mozilla/Types.h"

#ifdef __cplusplus

namespace mozilla {

//
// Suppress GCC warnings about unused return values with
//   Unused << SomeFuncDeclaredWarnUnusedReturnValue();
//
struct unused_t
{
  template<typename T>
  MOZ_ALWAYS_INLINE_EVEN_DEBUG void
  operator<<(const T& /*unused*/) const {}
};

extern MFBT_DATA const unused_t Unused;

} // namespace mozilla

#endif // __cplusplus

// An alternative to mozilla::Unused for use in (a) C code and (b) code where
// linking with unused.o is difficult.
#define MOZ_UNUSED(expr) \
  do { if (expr) { (void)0; } } while (0)

#endif // mozilla_unused_h