| 1 | /*===---- __stddef_null.h - Definition of NULL -----------------------------=== |
| 2 | * |
| 3 | * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | * See https://llvm.org/LICENSE.txt for license information. |
| 5 | * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | * |
| 7 | *===-----------------------------------------------------------------------=== |
| 8 | */ |
| 9 | |
| 10 | #if !defined(NULL) || !__building_module(_Builtin_stddef) |
| 11 | |
| 12 | /* linux/stddef.h will define NULL to 0. glibc (and other) headers then define |
| 13 | * __need_NULL and rely on stddef.h to redefine NULL to the correct value again. |
| 14 | * Modules don't support redefining macros like that, but support that pattern |
| 15 | * in the non-modules case. |
| 16 | */ |
| 17 | #undef NULL |
| 18 | |
| 19 | #ifdef __cplusplus |
| 20 | #if !defined(__MINGW32__) && !defined(_MSC_VER) |
| 21 | #define NULL __null |
| 22 | #else |
| 23 | #define NULL 0 |
| 24 | #endif |
| 25 | #else |
| 26 | #define NULL ((void*)0) |
| 27 | #endif |
| 28 | |
| 29 | #endif |