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
1.1 KiB
C++
31 lines
1.1 KiB
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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// UNSUPPORTED: c++03
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#include <uchar.h>
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#include "test_macros.h"
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// When C++ char8_t support is not enabled, definitions of these functions that
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// match the C2X declarations may still be present in the global namespace with
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// a char8_t typedef substituted for the C++ char8_t type. If so, these are not
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// the declarations we are looking for, so don't test for them.
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#if !defined(TEST_HAS_NO_CHAR8_T)
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using U = decltype(::c8rtomb);
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using V = decltype(::mbrtoc8);
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# if !_LIBCPP_HAS_C8RTOMB_MBRTOC8
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// expected-error@-3 {{no member named 'c8rtomb' in the global namespace}}
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// expected-error@-3 {{no member named 'mbrtoc8' in the global namespace}}
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# else
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// expected-no-diagnostics
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# endif
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#else
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// expected-no-diagnostics
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#endif
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