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
130 lines
2.5 KiB
C++
130 lines
2.5 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_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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#include <__assert> // all public C++ headers provide the assertion handler
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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 // _LIBCPP_CCTYPE
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