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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.
110 lines
3.6 KiB
C++
110 lines
3.6 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_CSTRING
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#define _LIBCPP_CSTRING
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/*
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cstring synopsis
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Macros:
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NULL
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namespace std
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{
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Types:
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size_t
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void* memcpy(void* restrict s1, const void* restrict s2, size_t n);
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void* memmove(void* s1, const void* s2, size_t n);
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char* strcpy (char* restrict s1, const char* restrict s2);
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char* strncpy(char* restrict s1, const char* restrict s2, size_t n);
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char* strcat (char* restrict s1, const char* restrict s2);
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char* strncat(char* restrict s1, const char* restrict s2, size_t n);
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int memcmp(const void* s1, const void* s2, size_t n);
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int strcmp (const char* s1, const char* s2);
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int strncmp(const char* s1, const char* s2, size_t n);
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int strcoll(const char* s1, const char* s2);
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size_t strxfrm(char* restrict s1, const char* restrict s2, size_t n);
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const void* memchr(const void* s, int c, size_t n);
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void* memchr( void* s, int c, size_t n);
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const char* strchr(const char* s, int c);
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char* strchr( char* s, int c);
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size_t strcspn(const char* s1, const char* s2);
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const char* strpbrk(const char* s1, const char* s2);
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char* strpbrk( char* s1, const char* s2);
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const char* strrchr(const char* s, int c);
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char* strrchr( char* s, int c);
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size_t strspn(const char* s1, const char* s2);
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const char* strstr(const char* s1, const char* s2);
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char* strstr( char* s1, const char* s2);
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char* strtok(char* restrict s1, const char* restrict s2);
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void* memset(void* s, int c, size_t n);
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char* strerror(int errnum);
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size_t strlen(const char* s);
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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/cstring>
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#else
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# include <__config>
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# include <__cstddef/size_t.h>
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# include <__type_traits/is_constant_evaluated.h>
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# include <string.h>
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# ifndef _LIBCPP_STRING_H
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# error <cstring> tried including <string.h> but didn't find libc++'s <string.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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using ::memcpy _LIBCPP_USING_IF_EXISTS;
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using ::memmove _LIBCPP_USING_IF_EXISTS;
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using ::strcpy _LIBCPP_USING_IF_EXISTS;
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using ::strncpy _LIBCPP_USING_IF_EXISTS;
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using ::strcat _LIBCPP_USING_IF_EXISTS;
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using ::strncat _LIBCPP_USING_IF_EXISTS;
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using ::memcmp _LIBCPP_USING_IF_EXISTS;
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using ::strcmp _LIBCPP_USING_IF_EXISTS;
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using ::strncmp _LIBCPP_USING_IF_EXISTS;
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using ::strcoll _LIBCPP_USING_IF_EXISTS;
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using ::strxfrm _LIBCPP_USING_IF_EXISTS;
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using ::memchr _LIBCPP_USING_IF_EXISTS;
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using ::strchr _LIBCPP_USING_IF_EXISTS;
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using ::strcspn _LIBCPP_USING_IF_EXISTS;
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using ::strpbrk _LIBCPP_USING_IF_EXISTS;
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using ::strrchr _LIBCPP_USING_IF_EXISTS;
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using ::strspn _LIBCPP_USING_IF_EXISTS;
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using ::strstr _LIBCPP_USING_IF_EXISTS;
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using ::strtok _LIBCPP_USING_IF_EXISTS;
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using ::memset _LIBCPP_USING_IF_EXISTS;
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using ::strerror _LIBCPP_USING_IF_EXISTS;
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using ::strlen _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_CSTRING
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