1 /* A C macro for declaring that a function does not return.
2 Copyright (C) 2011-2023 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify it
5 under the terms of the GNU Lesser General Public License as published
6 by the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 #ifndef _Noreturn
18 # if (defined __cplusplus \
19 && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
20 || (defined _MSC_VER && 1900 <= _MSC_VER)) \
21 && 0)
22 /* [[noreturn]] is not practically usable, because with it the syntax
23 extern _Noreturn void func (...);
24 would not be valid; such a declaration would only be valid with 'extern'
25 and '_Noreturn' swapped, or without the 'extern' keyword. However, some
26 AIX system header files and several gnulib header files use precisely
27 this syntax with 'extern'. */
28 # define _Noreturn [[noreturn]]
29 # elif (defined __clang__ && __clang_major__ < 16 \
30 && defined _GL_WORK_AROUND_LLVM_BUG_59792)
31 /* Compile with -D_GL_WORK_AROUND_LLVM_BUG_59792 to work around
32 that rare LLVM bug, though you may get many false-alarm warnings. */
33 # define _Noreturn
34 # elif ((!defined __cplusplus || defined __clang__) \
35 && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
36 || (!defined __STRICT_ANSI__ \
37 && (4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
38 || (defined __apple_build_version__ \
39 ? 6000000 <= __apple_build_version__ \
40 : 3 < __clang_major__ + (5 <= __clang_minor__))))))
41 /* _Noreturn works as-is. */
42 # elif (2 < __GNUC__ + (8 <= __GNUC_MINOR__) || defined __clang__ \
43 || 0x5110 <= __SUNPRO_C)
44 # define _Noreturn __attribute__ ((__noreturn__))
45 # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
46 # define _Noreturn __declspec (noreturn)
47 # else
48 # define _Noreturn
49 # endif
50 #endif