diff options
Diffstat (limited to 'tests/_Noreturn.h')
| -rw-r--r-- | tests/_Noreturn.h | 41 |
1 files changed, 17 insertions, 24 deletions
diff --git a/tests/_Noreturn.h b/tests/_Noreturn.h index 9806f2b1..d42f15ee 100644 --- a/tests/_Noreturn.h +++ b/tests/_Noreturn.h @@ -1,5 +1,5 @@ /* A C macro for declaring that a function does not return. - Copyright (C) 2011-2024 Free Software Foundation, Inc. + Copyright (C) 2011-2025 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published @@ -14,33 +14,26 @@ You should have received a copy of the GNU Lesser General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ +/* The _Noreturn keyword of C11. + Do not use [[noreturn]], because with it the syntax + extern _Noreturn void func (...); + would not be valid; such a declaration would be valid only with 'extern' + and '_Noreturn' swapped, or without the 'extern' keyword. However, some + AIX system header files and several gnulib header files use precisely + this syntax with 'extern'. So even though C23 deprecates _Noreturn, + it is currently more portable to prefer it to [[noreturn]]. + + Also, do not try to work around LLVM bug 59792 (clang 15 or earlier). + This rare bug can be worked around by compiling with 'clang -D_Noreturn=', + though the workaround may generate many false-alarm warnings. */ #ifndef _Noreturn -# if (defined __cplusplus \ - && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \ - || (defined _MSC_VER && 1900 <= _MSC_VER)) \ - && 0) - /* [[noreturn]] is not practically usable, because with it the syntax - extern _Noreturn void func (...); - would not be valid; such a declaration would only be valid with 'extern' - and '_Noreturn' swapped, or without the 'extern' keyword. However, some - AIX system header files and several gnulib header files use precisely - this syntax with 'extern'. */ -# define _Noreturn [[noreturn]] -# elif (defined __clang__ && __clang_major__ < 16 \ - && defined _GL_WORK_AROUND_LLVM_BUG_59792) - /* Compile with -D_GL_WORK_AROUND_LLVM_BUG_59792 to work around - that rare LLVM bug, though you may get many false-alarm warnings. */ -# define _Noreturn -# elif ((!defined __cplusplus || defined __clang__) \ - && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \ - || (!defined __STRICT_ANSI__ \ - && (4 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __clang__ \ - || (defined __apple_build_version__ \ - ? 6000000 <= __apple_build_version__ \ - : 3 < __clang_major__ + (5 <= __clang_minor__)))))) +# if ((!defined __cplusplus || defined __clang__) \ + && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0))) /* _Noreturn works as-is. */ # elif (2 < __GNUC__ + (8 <= __GNUC_MINOR__) || defined __clang__ \ || 0x5110 <= __SUNPRO_C) + /* Prefer __attribute__ ((__noreturn__)) to plain _Noreturn even if the + latter works, as 'gcc -std=gnu99 -Wpedantic' warns about _Noreturn. */ # define _Noreturn __attribute__ ((__noreturn__)) # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0) # define _Noreturn __declspec (noreturn) |