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As discussed on cfe-dev [1], use the using_if_exists Clang attribute when the compiler supports it. This makes it easier to port libc++ on top of new platforms that don't fully support the C Standard library. Previously, libc++ would fail to build when trying to import a missing declaration in a <cXXXX> header. With the attribute, the declaration will simply not be imported into namespace std, and hence it won't be available for libc++ to use. In many cases, the declarations were *not* actually required for libc++ to work (they were only surfaced for users to use them as std::XXXX), so not importing them into namespace std is acceptable. The same thing could be achieved by conscious usage of `#ifdef` along with platform detection, however that quickly creates a maintenance problem as libc++ is ported to new platforms. Furthermore, this problem is exacerbated when mixed with vendor internal-only platforms, which can lead to difficulties maintaining a downstream fork of the library. For the time being, we only use the using_if_exists attribute when it is supported. At some point in the future, we will start removing #ifdef paths that are unnecessary when the attribute is supported, and folks who need those #ifdef paths will be required to use a compiler that supports the attribute. [1]: http://lists.llvm.org/pipermail/cfe-dev/2020-June/066038.html Differential Revision: https://reviews.llvm.org/D90257
191 lines
3.4 KiB
C++
191 lines
3.4 KiB
C++
// -*- C++ -*-
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//===--------------------------- cstdint ----------------------------------===//
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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_CSTDINT
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#define _LIBCPP_CSTDINT
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/*
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cstdint 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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namespace std
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{
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Types:
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int8_t
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int16_t
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int32_t
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int64_t
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uint8_t
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uint16_t
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uint32_t
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uint64_t
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int_least8_t
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int_least16_t
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int_least32_t
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int_least64_t
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uint_least8_t
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uint_least16_t
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uint_least32_t
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uint_least64_t
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int_fast8_t
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int_fast16_t
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int_fast32_t
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int_fast64_t
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uint_fast8_t
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uint_fast16_t
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uint_fast32_t
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uint_fast64_t
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intptr_t
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uintptr_t
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intmax_t
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uintmax_t
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} // std
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*/
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#include <__config>
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#include <stdint.h>
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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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using ::int8_t _LIBCPP_USING_IF_EXISTS;
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using ::int16_t _LIBCPP_USING_IF_EXISTS;
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using ::int32_t _LIBCPP_USING_IF_EXISTS;
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using ::int64_t _LIBCPP_USING_IF_EXISTS;
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using ::uint8_t _LIBCPP_USING_IF_EXISTS;
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using ::uint16_t _LIBCPP_USING_IF_EXISTS;
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using ::uint32_t _LIBCPP_USING_IF_EXISTS;
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using ::uint64_t _LIBCPP_USING_IF_EXISTS;
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using ::int_least8_t _LIBCPP_USING_IF_EXISTS;
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using ::int_least16_t _LIBCPP_USING_IF_EXISTS;
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using ::int_least32_t _LIBCPP_USING_IF_EXISTS;
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using ::int_least64_t _LIBCPP_USING_IF_EXISTS;
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using ::uint_least8_t _LIBCPP_USING_IF_EXISTS;
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using ::uint_least16_t _LIBCPP_USING_IF_EXISTS;
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using ::uint_least32_t _LIBCPP_USING_IF_EXISTS;
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using ::uint_least64_t _LIBCPP_USING_IF_EXISTS;
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using ::int_fast8_t _LIBCPP_USING_IF_EXISTS;
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using ::int_fast16_t _LIBCPP_USING_IF_EXISTS;
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using ::int_fast32_t _LIBCPP_USING_IF_EXISTS;
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using ::int_fast64_t _LIBCPP_USING_IF_EXISTS;
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using ::uint_fast8_t _LIBCPP_USING_IF_EXISTS;
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using ::uint_fast16_t _LIBCPP_USING_IF_EXISTS;
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using ::uint_fast32_t _LIBCPP_USING_IF_EXISTS;
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using ::uint_fast64_t _LIBCPP_USING_IF_EXISTS;
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using ::intptr_t _LIBCPP_USING_IF_EXISTS;
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using ::uintptr_t _LIBCPP_USING_IF_EXISTS;
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using ::intmax_t _LIBCPP_USING_IF_EXISTS;
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using ::uintmax_t _LIBCPP_USING_IF_EXISTS;
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_CSTDINT
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