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.
103 lines
2.9 KiB
C++
103 lines
2.9 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_CWCTYPE
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#define _LIBCPP_CWCTYPE
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/*
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cwctype synopsis
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Macros:
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WEOF
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namespace std
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{
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Types:
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wint_t
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wctrans_t
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wctype_t
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int iswalnum(wint_t wc);
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int iswalpha(wint_t wc);
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int iswblank(wint_t wc); // C99
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int iswcntrl(wint_t wc);
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int iswdigit(wint_t wc);
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int iswgraph(wint_t wc);
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int iswlower(wint_t wc);
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int iswprint(wint_t wc);
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int iswpunct(wint_t wc);
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int iswspace(wint_t wc);
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int iswupper(wint_t wc);
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int iswxdigit(wint_t wc);
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int iswctype(wint_t wc, wctype_t desc);
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wctype_t wctype(const char* property);
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wint_t towlower(wint_t wc);
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wint_t towupper(wint_t wc);
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wint_t towctrans(wint_t wc, wctrans_t desc);
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wctrans_t wctrans(const char* property);
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} // std
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*/
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#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/cwctype>
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#else
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# include <__config>
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# include <cctype>
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# include <wctype.h>
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# ifndef _LIBCPP_WCTYPE_H
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# error <cwctype> tried including <wctype.h> but didn't find libc++'s <wctype.h> header. \
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This usually means that your header search paths are not configured properly. \
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The header search paths should contain the C++ Standard Library headers before \
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any C Standard Library, and you are probably using compiler flags that make that \
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not be the case.
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# endif
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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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_LIBCPP_BEGIN_NAMESPACE_STD
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# if defined(_LIBCPP_INCLUDED_C_LIBRARY_WCTYPE_H)
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using ::wint_t _LIBCPP_USING_IF_EXISTS;
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using ::wctrans_t _LIBCPP_USING_IF_EXISTS;
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using ::wctype_t _LIBCPP_USING_IF_EXISTS;
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using ::iswalnum _LIBCPP_USING_IF_EXISTS;
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using ::iswalpha _LIBCPP_USING_IF_EXISTS;
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using ::iswblank _LIBCPP_USING_IF_EXISTS;
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using ::iswcntrl _LIBCPP_USING_IF_EXISTS;
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using ::iswdigit _LIBCPP_USING_IF_EXISTS;
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using ::iswgraph _LIBCPP_USING_IF_EXISTS;
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using ::iswlower _LIBCPP_USING_IF_EXISTS;
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using ::iswprint _LIBCPP_USING_IF_EXISTS;
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using ::iswpunct _LIBCPP_USING_IF_EXISTS;
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using ::iswspace _LIBCPP_USING_IF_EXISTS;
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using ::iswupper _LIBCPP_USING_IF_EXISTS;
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using ::iswxdigit _LIBCPP_USING_IF_EXISTS;
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using ::iswctype _LIBCPP_USING_IF_EXISTS;
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using ::wctype _LIBCPP_USING_IF_EXISTS;
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using ::towlower _LIBCPP_USING_IF_EXISTS;
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using ::towupper _LIBCPP_USING_IF_EXISTS;
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using ::towctrans _LIBCPP_USING_IF_EXISTS;
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using ::wctrans _LIBCPP_USING_IF_EXISTS;
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# endif // _LIBCPP_INCLUDED_C_LIBRARY_WCTYPE_H
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_LIBCPP_END_NAMESPACE_STD
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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_CWCTYPE
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