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