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47 lines
2.0 KiB
C++
47 lines
2.0 KiB
C++
//===--- SwiftStddef.h ------------------------------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_STDLIB_SHIMS_SWIFT_STDDEF_H
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#define SWIFT_STDLIB_SHIMS_SWIFT_STDDEF_H
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// stddef.h is provided by Clang, but it dispatches to libc's stddef.h. As a
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// result, using stddef.h here would pull in Darwin module (which includes
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// libc). This creates a dependency cycle, so we can't use stddef.h in
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// SwiftShims.
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// On Linux, the story is different. We get the error message
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// "/usr/include/x86_64-linux-gnu/sys/types.h:146:10: error: 'stddef.h' file not
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// found"
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// This is a known Clang/Ubuntu bug.
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#if !defined(__APPLE__) && !defined(__linux__)
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#include <stddef.h>
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typedef size_t __swift_size_t;
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#else
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typedef __SIZE_TYPE__ __swift_size_t;
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#endif
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// This selects the signed equivalent of the unsigned type chosen for size_t.
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#if __STDC_VERSION__-0 >= 201112l || defined(__swift__)
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typedef __typeof__(_Generic((__swift_size_t)0, \
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unsigned long long int : (long long int)0, \
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unsigned long int : (long int)0, \
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unsigned int : (int)0, \
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unsigned short : (short)0, \
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unsigned char : (signed char)0)) __swift_ssize_t;
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#elif defined(__cplusplus)
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#include <type_traits>
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using __swift_ssize_t = std::make_signed<__swift_size_t>::type;
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#else
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#error "do not have __swift_ssize_t defined"
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#endif
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#endif // SWIFT_STDLIB_SHIMS_SWIFT_STDDEF_H
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