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5d87f60f89
Some platforms don't provide all C library headers. In practice, libc++
only requires a few C library headers to exist, and only a few functions
on those headers. Missing functions that libc++ doesn't need for its own
implementation are handled properly by the using_if_exists attribute,
however a missing header is currently a hard error when we try to
do #include_next.
This patch should make libc++ more flexible on platforms that do not
provide C headers that libc++ doesn't actually require for its own
implementation. The only downside is that it may move some errors from
the #include_next point to later in the compilation if we actually try
to use something that isn't provided, which could be somewhat confusing.
However, these errors should be caught by folks trying to port libc++
over to a new platform (when running the libc++ test suite), not by end
users.
NOTE: This is a reapplicaton of 226409, which was reverted in 674729813
because it broke the build. The issue has now been fixed with
https://reviews.llvm.org/D138062.
Differential Revision: https://reviews.llvm.org/D136683
128 lines
2.3 KiB
C++
128 lines
2.3 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_STDINT_H
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// AIX system headers need stdint.h to be re-enterable while _STD_TYPES_T
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// is defined until an inclusion of it without _STD_TYPES_T occurs, in which
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// case the header guard macro is defined.
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#if !defined(_AIX) || !defined(_STD_TYPES_T)
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#define _LIBCPP_STDINT_H
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#endif // _STD_TYPES_T
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/*
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stdint.h synopsis
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Macros:
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INT8_MIN
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INT16_MIN
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INT32_MIN
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INT64_MIN
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INT8_MAX
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INT16_MAX
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INT32_MAX
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INT64_MAX
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UINT8_MAX
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UINT16_MAX
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UINT32_MAX
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UINT64_MAX
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INT_LEAST8_MIN
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INT_LEAST16_MIN
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INT_LEAST32_MIN
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INT_LEAST64_MIN
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INT_LEAST8_MAX
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INT_LEAST16_MAX
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INT_LEAST32_MAX
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INT_LEAST64_MAX
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UINT_LEAST8_MAX
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UINT_LEAST16_MAX
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UINT_LEAST32_MAX
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UINT_LEAST64_MAX
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INT_FAST8_MIN
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INT_FAST16_MIN
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INT_FAST32_MIN
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INT_FAST64_MIN
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INT_FAST8_MAX
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INT_FAST16_MAX
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INT_FAST32_MAX
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INT_FAST64_MAX
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UINT_FAST8_MAX
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UINT_FAST16_MAX
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UINT_FAST32_MAX
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UINT_FAST64_MAX
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INTPTR_MIN
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INTPTR_MAX
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UINTPTR_MAX
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INTMAX_MIN
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INTMAX_MAX
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UINTMAX_MAX
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PTRDIFF_MIN
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PTRDIFF_MAX
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SIG_ATOMIC_MIN
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SIG_ATOMIC_MAX
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SIZE_MAX
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WCHAR_MIN
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WCHAR_MAX
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WINT_MIN
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WINT_MAX
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INT8_C(value)
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INT16_C(value)
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INT32_C(value)
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INT64_C(value)
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UINT8_C(value)
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UINT16_C(value)
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UINT32_C(value)
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UINT64_C(value)
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INTMAX_C(value)
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UINTMAX_C(value)
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*/
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#include <__config>
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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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/* C99 stdlib (e.g. glibc < 2.18) does not provide macros needed
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for C++11 unless __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS
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are defined
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*/
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#if defined(__cplusplus) && !defined(__STDC_LIMIT_MACROS)
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# define __STDC_LIMIT_MACROS
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#endif
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#if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS)
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# define __STDC_CONSTANT_MACROS
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#endif
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#if __has_include_next(<stdint.h>)
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# include_next <stdint.h>
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#endif
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#endif // _LIBCPP_STDINT_H
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