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b9a2658a3e
This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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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#ifndef _LIBCPP_UCHAR_H
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#define _LIBCPP_UCHAR_H
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/*
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uchar.h synopsis // since C++11
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Macros:
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__STDC_UTF_16__
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__STDC_UTF_32__
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Types:
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mbstate_t
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size_t
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size_t mbrtoc8(char8_t* pc8, const char* s, size_t n, mbstate_t* ps); // since C++20
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size_t c8rtomb(char* s, char8_t c8, mbstate_t* ps); // since C++20
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size_t mbrtoc16(char16_t* pc16, const char* s, size_t n, mbstate_t* ps);
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size_t c16rtomb(char* s, char16_t c16, mbstate_t* ps);
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size_t mbrtoc32(char32_t* pc32, const char* s, size_t n, mbstate_t* ps);
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size_t c32rtomb(char* s, char32_t c32, mbstate_t* ps);
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*/
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#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/uchar.h>
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#else
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# include <__config>
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# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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# endif
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# if !defined(_LIBCPP_CXX03_LANG)
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// Some platforms don't implement <uchar.h> and we don't want to give a hard
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// error on those platforms. When the platform doesn't provide <uchar.h>, at
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// least include <stddef.h> so we get the declaration for size_t, and try to
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// get the declaration of mbstate_t too.
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# if __has_include_next(<uchar.h>)
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# include_next <uchar.h>
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# else
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# include <__mbstate_t.h>
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# include <stddef.h>
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# endif
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# endif // _LIBCPP_CXX03_LANG
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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_UCHAR_H
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