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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.
116 lines
4.3 KiB
C++
116 lines
4.3 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_STRING_H
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#define _LIBCPP_STRING_H
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/*
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string.h synopsis
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Macros:
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NULL
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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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*/
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#if defined(__cplusplus) && __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/string.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 __has_include_next(<string.h>)
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# include_next <string.h>
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# endif
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// MSVCRT, GNU libc and its derivates may already have the correct prototype in
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// <string.h>. This macro can be defined by users if their C library provides
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// the right signature.
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# if defined(__CORRECT_ISO_CPP_STRING_H_PROTO) || defined(_LIBCPP_MSVCRT) || \
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defined(_STRING_H_CPLUSPLUS_98_CONFORMANCE_)
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# define _LIBCPP_STRING_H_HAS_CONST_OVERLOADS
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# endif
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# if defined(__cplusplus) && !defined(_LIBCPP_STRING_H_HAS_CONST_OVERLOADS) && defined(_LIBCPP_PREFERRED_OVERLOAD)
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extern "C++" {
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD const char* strchr(const char* __s, int __c) {
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return __builtin_strchr(__s, __c);
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}
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD char* strchr(char* __s, int __c) {
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return __builtin_strchr(__s, __c);
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}
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD const char* strpbrk(const char* __s1, const char* __s2) {
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return __builtin_strpbrk(__s1, __s2);
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}
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD char* strpbrk(char* __s1, const char* __s2) {
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return __builtin_strpbrk(__s1, __s2);
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}
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD const char* strrchr(const char* __s, int __c) {
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return __builtin_strrchr(__s, __c);
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}
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD char* strrchr(char* __s, int __c) {
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return __builtin_strrchr(__s, __c);
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}
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD const void* memchr(const void* __s, int __c, size_t __n) {
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return __builtin_memchr(__s, __c, __n);
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}
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD void* memchr(void* __s, int __c, size_t __n) {
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return __builtin_memchr(__s, __c, __n);
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}
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD const char* strstr(const char* __s1, const char* __s2) {
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return __builtin_strstr(__s1, __s2);
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}
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_PREFERRED_OVERLOAD char* strstr(char* __s1, const char* __s2) {
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return __builtin_strstr(__s1, __s2);
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}
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} // extern "C++"
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# endif
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#endif // defined(__cplusplus) && __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_STRING_H
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