ba87515fea
Currently, the library-internal feature test macros are only defined if the feature is not available, and always have the prefix `_LIBCPP_HAS_NO_`. This patch changes that, so that they are always defined and have the prefix `_LIBCPP_HAS_` instead. This changes the canonical use of these macros to `#if _LIBCPP_HAS_FEATURE`, which means that using an undefined macro (e.g. due to a missing include) is diagnosed now. While this is rather unlikely currently, a similar change in `<__configuration/availability.h>` caught a few bugs. This also improves readability, since it removes the double-negation of `#ifndef _LIBCPP_HAS_NO_FEATURE`. The current patch only touches the macros defined in `<__config>`. If people are happy with this approach, I'll make a follow-up PR to also change the macros defined in `<__config_site>`.
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___CONFIGURATION_LANGUAGE_H
|
|
#define _LIBCPP___CONFIGURATION_LANGUAGE_H
|
|
|
|
#include <__config_site>
|
|
|
|
#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
// NOLINTBEGIN(libcpp-cpp-version-check)
|
|
#ifdef __cplusplus
|
|
# if __cplusplus <= 201103L
|
|
# define _LIBCPP_STD_VER 11
|
|
# elif __cplusplus <= 201402L
|
|
# define _LIBCPP_STD_VER 14
|
|
# elif __cplusplus <= 201703L
|
|
# define _LIBCPP_STD_VER 17
|
|
# elif __cplusplus <= 202002L
|
|
# define _LIBCPP_STD_VER 20
|
|
# elif __cplusplus <= 202302L
|
|
# define _LIBCPP_STD_VER 23
|
|
# else
|
|
// Expected release year of the next C++ standard
|
|
# define _LIBCPP_STD_VER 26
|
|
# endif
|
|
#endif // __cplusplus
|
|
// NOLINTEND(libcpp-cpp-version-check)
|
|
|
|
#if defined(__cpp_rtti) && __cpp_rtti >= 199711L
|
|
# define _LIBCPP_HAS_RTTI 1
|
|
#else
|
|
# define _LIBCPP_HAS_RTTI 0
|
|
#endif
|
|
|
|
#if defined(__cpp_exceptions) && __cpp_exceptions >= 199711L
|
|
# define _LIBCPP_HAS_EXCEPTIONS 1
|
|
#else
|
|
# define _LIBCPP_HAS_EXCEPTIONS 0
|
|
#endif
|
|
|
|
#endif // _LIBCPP___CONFIGURATION_LANGUAGE_H
|