compiler_specific.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef FLUTTER_FML_COMPILER_SPECIFIC_H_
#define FLUTTER_FML_COMPILER_SPECIFIC_H_
 
#if !defined(__GNUC__) && !defined(__clang__) && !defined(_MSC_VER)
#error Unsupported compiler.
#endif
 
// Annotate a variable indicating it's ok if the variable is not used.
// (Typically used to silence a compiler warning when the assignment
// is important for some other reason.)
// Use like:
//   int x = ...;
//   FML_ALLOW_UNUSED_LOCAL(x);
#define FML_ALLOW_UNUSED_LOCAL(x) false ? (void)x : (void)0
 
// Annotate a typedef or function indicating it's ok if it's not used.
// Use like:
//   typedef Foo Bar ALLOW_UNUSED_TYPE;
#if defined(__GNUC__) || defined(__clang__)
#define FML_ALLOW_UNUSED_TYPE __attribute__((unused))
#else
#define FML_ALLOW_UNUSED_TYPE
#endif
 
#endif  // FLUTTER_FML_COMPILER_SPECIFIC_H_