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>`.
31 lines
745 B
C++
31 lines
745 B
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include <__verbose_abort>
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#include <new>
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namespace std { // purposefully not versioned
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#ifndef __GLIBCXX__
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const nothrow_t nothrow{};
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#endif
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#ifndef LIBSTDCXX
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void __throw_bad_alloc() {
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# if _LIBCPP_HAS_EXCEPTIONS
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throw bad_alloc();
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# else
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_LIBCPP_VERBOSE_ABORT("bad_alloc was thrown in -fno-exceptions mode");
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# endif
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}
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#endif // !LIBSTDCXX
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} // namespace std
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