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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
99 lines
2.7 KiB
C++
99 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_CWCTYPE
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#define _LIBCPP_CWCTYPE
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/*
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cwctype synopsis
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Macros:
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WEOF
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namespace std
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{
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Types:
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wint_t
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wctrans_t
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wctype_t
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int iswalnum(wint_t wc);
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int iswalpha(wint_t wc);
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int iswblank(wint_t wc); // C99
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int iswcntrl(wint_t wc);
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int iswdigit(wint_t wc);
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int iswgraph(wint_t wc);
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int iswlower(wint_t wc);
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int iswprint(wint_t wc);
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int iswpunct(wint_t wc);
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int iswspace(wint_t wc);
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int iswupper(wint_t wc);
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int iswxdigit(wint_t wc);
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int iswctype(wint_t wc, wctype_t desc);
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wctype_t wctype(const char* property);
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wint_t towlower(wint_t wc);
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wint_t towupper(wint_t wc);
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wint_t towctrans(wint_t wc, wctrans_t desc);
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wctrans_t wctrans(const char* property);
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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 <cctype>
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#include <wctype.h>
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#ifndef _LIBCPP_WCTYPE_H
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# error <cwctype> tried including <wctype.h> but didn't find libc++'s <wctype.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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#if defined(_LIBCPP_INCLUDED_C_LIBRARY_WCTYPE_H)
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using ::wint_t _LIBCPP_USING_IF_EXISTS;
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using ::wctrans_t _LIBCPP_USING_IF_EXISTS;
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using ::wctype_t _LIBCPP_USING_IF_EXISTS;
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using ::iswalnum _LIBCPP_USING_IF_EXISTS;
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using ::iswalpha _LIBCPP_USING_IF_EXISTS;
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using ::iswblank _LIBCPP_USING_IF_EXISTS;
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using ::iswcntrl _LIBCPP_USING_IF_EXISTS;
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using ::iswdigit _LIBCPP_USING_IF_EXISTS;
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using ::iswgraph _LIBCPP_USING_IF_EXISTS;
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using ::iswlower _LIBCPP_USING_IF_EXISTS;
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using ::iswprint _LIBCPP_USING_IF_EXISTS;
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using ::iswpunct _LIBCPP_USING_IF_EXISTS;
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using ::iswspace _LIBCPP_USING_IF_EXISTS;
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using ::iswupper _LIBCPP_USING_IF_EXISTS;
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using ::iswxdigit _LIBCPP_USING_IF_EXISTS;
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using ::iswctype _LIBCPP_USING_IF_EXISTS;
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using ::wctype _LIBCPP_USING_IF_EXISTS;
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using ::towlower _LIBCPP_USING_IF_EXISTS;
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using ::towupper _LIBCPP_USING_IF_EXISTS;
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using ::towctrans _LIBCPP_USING_IF_EXISTS;
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using ::wctrans _LIBCPP_USING_IF_EXISTS;
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#endif // _LIBCPP_INCLUDED_C_LIBRARY_WCTYPE_H
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_CWCTYPE
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