llvm-capstone/libcxx/include/uchar.h
Ian Anderson a595b931f1 [libc++] cuchar redeclares ::mbstate_t when it's in its own clang module
When cuchar is compiled independently on platforms that don't have <uchar.h>, it doesn't get a declaration of mbstate_t, and so makes an empty declaration for ::mbstate_t. That conflicts with the declarations in __mbstate_t.h and cwchar since both of those headers do get mbstate_t before making ::mbstate_t.

Change `__mbstate_t.h` to just get the underlying declaration for mbstate_t and not make a declaration for ::mbstate_t. Include __mbstate_t.h in uchar.h and wchar.h when their next headers aren't available so that at least mbstate_t gets defined.

Add __std_mbstate_t.h to declare ::mbstate_t for headers that need that when cuchar or cwchar aren't available (because either _LIBCPP_HAS_NO_WIDE_CHARACTERS or _LIBCPP_CXX03_LANG).

Reviewed By: ldionne, Mordante, #libc, philnik

Differential Revision: https://reviews.llvm.org/D148542
2023-05-01 13:48:20 -05:00

57 lines
1.5 KiB
C++

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_UCHAR_H
#define _LIBCPP_UCHAR_H
/*
uchar.h synopsis // since C++11
Macros:
__STDC_UTF_16__
__STDC_UTF_32__
Types:
mbstate_t
size_t
size_t mbrtoc8(char8_t* pc8, const char* s, size_t n, mbstate_t* ps); // since C++20
size_t c8rtomb(char* s, char8_t c8, mbstate_t* ps); // since C++20
size_t mbrtoc16(char16_t* pc16, const char* s, size_t n, mbstate_t* ps);
size_t c16rtomb(char* s, char16_t c16, mbstate_t* ps);
size_t mbrtoc32(char32_t* pc32, const char* s, size_t n, mbstate_t* ps);
size_t c32rtomb(char* s, char32_t c32, mbstate_t* ps);
*/
#include <__config>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if !defined(_LIBCPP_CXX03_LANG)
// Some platforms don't implement <uchar.h> and we don't want to give a hard
// error on those platforms. When the platform doesn't provide <uchar.h>, at
// least include <stddef.h> so we get the declaration for size_t, and try to
// get the declaration of mbstate_t too.
#if __has_include_next(<uchar.h>)
# include_next <uchar.h>
#else
# include <__mbstate_t.h>
# include <stddef.h>
#endif
#endif // _LIBCPP_CXX03_LANG
#endif // _LIBCPP_UCHAR_H