1 /* A substitute for ISO C11 <stdnoreturn.h>. 2 3 Copyright 2012-2021 Free Software Foundation, Inc. 4 5 This file is free software: you can redistribute it and/or modify 6 it under the terms of the GNU Lesser General Public License as 7 published by the Free Software Foundation; either version 2.1 of the 8 License, or (at your option) any later version. 9 10 This file is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18 /* Written by Paul Eggert. */ 19 20 #ifndef noreturn 21 22 /* ISO C11 <stdnoreturn.h> for platforms that lack it. 23 24 References: 25 ISO C11 (latest free draft 26 <http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf>) 27 section 7.23 */ 28 29 /* The definition of _Noreturn is copied here. */ 30 31 #if 1200 <= _MSC_VER || defined __CYGWIN__ 32 /* On MSVC, standard include files contain declarations like 33 __declspec (noreturn) void abort (void); 34 "#define noreturn _Noreturn" would cause this declaration to be rewritten 35 to the invalid 36 __declspec (__declspec (noreturn)) void abort (void); 37 38 Similarly, on Cygwin, standard include files contain declarations like 39 void __cdecl abort (void) __attribute__ ((noreturn)); 40 "#define noreturn _Noreturn" would cause this declaration to be rewritten 41 to the invalid 42 void __cdecl abort (void) __attribute__ ((__attribute__ ((__noreturn__)))); 43 44 Instead, define noreturn to empty, so that such declarations are rewritten to 45 __declspec () void abort (void); 46 or 47 void __cdecl abort (void) __attribute__ (()); 48 respectively. This gives up on noreturn's advice to the compiler but at 49 least it is valid code. */ 50 # define noreturn /*empty*/ 51 #else 52 # define noreturn _Noreturn 53 #endif 54 55 /* Did he ever return? 56 No he never returned 57 And his fate is still unlearn'd ... 58 -- Steiner J, Hawes BL. M.T.A. (1949) */ 59 60 #endif /* noreturn */