1// Copyright 2020 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef INCLUDE_CPPGC_INTERNAL_COMPILER_SPECIFIC_H_
6#define INCLUDE_CPPGC_INTERNAL_COMPILER_SPECIFIC_H_
7
8namespace cppgc {
9
10#if defined(__has_attribute)
11#define CPPGC_HAS_ATTRIBUTE(FEATURE) __has_attribute(FEATURE)
12#else
13#define CPPGC_HAS_ATTRIBUTE(FEATURE) 0
14#endif
15
16#if defined(__has_cpp_attribute)
17#define CPPGC_HAS_CPP_ATTRIBUTE(FEATURE) __has_cpp_attribute(FEATURE)
18#else
19#define CPPGC_HAS_CPP_ATTRIBUTE(FEATURE) 0
20#endif
21
22// [[no_unique_address]] comes in C++20 but supported in clang with -std >=
23// c++11.
24#if CPPGC_HAS_CPP_ATTRIBUTE(no_unique_address)
25#define CPPGC_NO_UNIQUE_ADDRESS [[no_unique_address]]
26#else
27#define CPPGC_NO_UNIQUE_ADDRESS
28#endif
29
30#if CPPGC_HAS_ATTRIBUTE(unused)
31#define CPPGC_UNUSED __attribute__((unused))
32#else
33#define CPPGC_UNUSED
34#endif
35
36}  // namespace cppgc
37
38#endif  // INCLUDE_CPPGC_INTERNAL_COMPILER_SPECIFIC_H_
39