7226f424bf
This PR allows libc++ to be configured to use LLVM-libc without
requiring locale-variants of libc functions.
This PR updates libc++ to use `<llvm-libc-types/mbstate_t.h>`
when building against LLVM-libc to avoid pulling in all of `wchar.h`.
There is some code duplication in this PR. The code in `formatting.h` is
similar to the implementation in `fuchsia.h`, except that the new code
does not use thread-local locales via `__locale_guard`:
673002f325/libcxx/include/__locale_dir/support/fuchsia.h (L133)
If reviewers would like, I'm happy to refactor to create more shared
headers, similar to how `no_locale` is set up. I've avoided doing so in
this PR, but lmk. It looks like there's three general ways these
passthrough functions are defined for unix systems:
- No locale (e.g. Fuchsia's `strtod` ignores locales entirely).
- Thread-local locale (e.g. other Fuchsia functions use `__locale_guard`
set up locales via `uselocale`).
- Native locale-specific function variant (i.e. the proxy just uses the
*_l variant, like `toupper_l`).
58 lines
2.3 KiB
C++
58 lines
2.3 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___MBSTATE_T_H
|
|
#define _LIBCPP___MBSTATE_T_H
|
|
|
|
#include <__config>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
// The goal of this header is to provide mbstate_t without requiring all of
|
|
// <uchar.h> or <wchar.h>. It's also used by the libc++ versions of <uchar.h>
|
|
// and <wchar.h> to get mbstate_t when the C library doesn't provide <uchar.h>
|
|
// or <wchar.h>, hence the #include_next of those headers instead of #include.
|
|
// (e.g. if <wchar.h> isn't present in the C library, the libc++ <wchar.h>
|
|
// will include this header. This header needs to not turn around and cyclically
|
|
// include <wchar.h>, but fall through to <uchar.h>.)
|
|
//
|
|
// This does not define std::mbstate_t -- this only brings in the declaration
|
|
// in the global namespace.
|
|
|
|
// We define this here to support older versions of glibc <wchar.h> that do
|
|
// not define this for clang. This is also set in libc++'s <wchar.h> header,
|
|
// and we need to do so here too to avoid a different function signature given
|
|
// a different include order.
|
|
#ifdef __cplusplus
|
|
# define __CORRECT_ISO_CPP_WCHAR_H_PROTO
|
|
#endif
|
|
|
|
#if _LIBCPP_HAS_MUSL_LIBC
|
|
# define __NEED_mbstate_t
|
|
# include <bits/alltypes.h>
|
|
# undef __NEED_mbstate_t
|
|
#elif _LIBCPP_LIBC_LLVM_LIBC
|
|
# include <llvm-libc-types/mbstate_t.h>
|
|
#elif __has_include(<bits/types/mbstate_t.h>)
|
|
# include <bits/types/mbstate_t.h> // works on most Unixes
|
|
#elif __has_include(<sys/_types/_mbstate_t.h>)
|
|
# include <sys/_types/_mbstate_t.h> // works on Darwin
|
|
#elif __has_include(<bits/mbstate_t.h>)
|
|
# include <bits/mbstate_t.h> // works for Android
|
|
#elif __has_include_next(<wchar.h>)
|
|
# include_next <wchar.h> // use the C standard provider of mbstate_t if present
|
|
#elif __has_include_next(<uchar.h>)
|
|
# include_next <uchar.h> // Try <uchar.h> in absence of <wchar.h> for mbstate_t
|
|
#else
|
|
# error "We don't know how to get the definition of mbstate_t on your platform."
|
|
#endif
|
|
|
|
#endif // _LIBCPP___MBSTATE_T_H
|