lib/stdnoreturn.in.h

   1 /* A substitute for ISO C11 <stdnoreturn.h>.
   2
   3    Copyright 2012-2017 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program 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 General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, see <http://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
  32 /* Standard include files on this platform contain declarations like
  33    "__declspec (noreturn) void abort (void);".  "#define noreturn
  34    _Noreturn" would cause this declaration to be rewritten to the
  35    invalid "__declspec (__declspec (noreturn)) void abort (void);".
  36    Instead, define noreturn to empty, so that such declarations are
  37    rewritten to "__declspec () void abort (void);", which is
  38    equivalent to "void abort (void);"; this gives up on noreturn's
  39    advice to the compiler but at least it is valid code.  */
  40 # define noreturn /*empty*/
  41 #else
  42 # define noreturn _Noreturn
  43 #endif
  44
  45 /* Did he ever return?
  46    No he never returned
  47    And his fate is still unlearn'd ...
  48      -- Steiner J, Hawes BL.  M.T.A. (1949)  */
  49
  50 #endif /* noreturn */