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.
132 lines
2.7 KiB
C++
132 lines
2.7 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_CCTYPE
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#define _LIBCPP_CCTYPE
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/*
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cctype synopsis
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namespace std
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{
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int isalnum(int c);
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int isalpha(int c);
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int isblank(int c); // C99
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int iscntrl(int c);
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int isdigit(int c);
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int isgraph(int c);
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int islower(int c);
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int isprint(int c);
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int ispunct(int c);
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int isspace(int c);
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int isupper(int c);
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int isxdigit(int c);
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int tolower(int c);
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int toupper(int c);
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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/cctype>
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#else
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# include <__config>
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# include <ctype.h>
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# ifndef _LIBCPP_CTYPE_H
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# error <cctype> tried including <ctype.h> but didn't find libc++'s <ctype.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.
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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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# ifdef isalnum
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# undef isalnum
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# endif
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# ifdef isalpha
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# undef isalpha
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# endif
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# ifdef isblank
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# undef isblank
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# endif
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# ifdef iscntrl
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# undef iscntrl
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# endif
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# ifdef isdigit
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# undef isdigit
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# endif
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# ifdef isgraph
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# undef isgraph
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# endif
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# ifdef islower
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# undef islower
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# endif
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# ifdef isprint
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# undef isprint
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# endif
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# ifdef ispunct
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# undef ispunct
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# endif
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# ifdef isspace
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# undef isspace
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# endif
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# ifdef isupper
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# undef isupper
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# endif
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# ifdef isxdigit
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# undef isxdigit
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# endif
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# ifdef tolower
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# undef tolower
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# endif
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# ifdef toupper
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# undef toupper
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# endif
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using ::isalnum _LIBCPP_USING_IF_EXISTS;
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using ::isalpha _LIBCPP_USING_IF_EXISTS;
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using ::isblank _LIBCPP_USING_IF_EXISTS;
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using ::iscntrl _LIBCPP_USING_IF_EXISTS;
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using ::isdigit _LIBCPP_USING_IF_EXISTS;
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using ::isgraph _LIBCPP_USING_IF_EXISTS;
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using ::islower _LIBCPP_USING_IF_EXISTS;
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using ::isprint _LIBCPP_USING_IF_EXISTS;
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using ::ispunct _LIBCPP_USING_IF_EXISTS;
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using ::isspace _LIBCPP_USING_IF_EXISTS;
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using ::isupper _LIBCPP_USING_IF_EXISTS;
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using ::isxdigit _LIBCPP_USING_IF_EXISTS;
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using ::tolower _LIBCPP_USING_IF_EXISTS;
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using ::toupper _LIBCPP_USING_IF_EXISTS;
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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_CCTYPE
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