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8cedff10a1
An issue I often see in codebases compiled for unusual platforms is that header search paths are specified manually and are subtly wrong. For example, people will manually add `-isystem <some-toolchain>/usr/include`, which ends up messing up the layering of header search paths required by libc++ (because the C Standard Library now appears *before* libc++ in the search paths). Without this patch, this will end up causing compilation errors that are pretty inscrutable. This patch aims to improve the user experience by diagnosing this issue explicitly. In all cases I can think of, I would expect that a compilation error occur if these header search paths are not layered properly. This should only provide an explicit diagnostic instead of failing due to seemingly unrelated compilation errors. Differential Revision: https://reviews.llvm.org/D131441
105 lines
3.5 KiB
C++
105 lines
3.5 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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#include <__assert> // all public C++ headers provide the assertion handler
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#include <__config>
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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 ::size_t _LIBCPP_USING_IF_EXISTS;
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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 // _LIBCPP_CSTRING
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