New upstream version 1.9

[debian/gzip] / lib / stdnoreturn.in.h

diff --git a/lib/stdnoreturn.in.h b/lib/stdnoreturn.in.h
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+/* A substitute for ISO C11 <stdnoreturn.h>.
+
+   Copyright 2012-2018 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert.  */
+
+#ifndef noreturn
+
+/* ISO C11 <stdnoreturn.h> for platforms that lack it.
+
+   References:
+   ISO C11 (latest free draft
+   <http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf>)
+   section 7.23 */
+
+/* The definition of _Noreturn is copied here.  */
+
+#if 1200 <= _MSC_VER || defined __CYGWIN__
+/* On MSVC, standard include files contain declarations like
+     __declspec (noreturn) void abort (void);
+   "#define noreturn _Noreturn" would cause this declaration to be rewritten
+   to the invalid
+     __declspec (__declspec (noreturn)) void abort (void);
+
+   Similarly, on Cygwin, standard include files contain declarations like
+     void __cdecl abort (void) __attribute__ ((noreturn));
+   "#define noreturn _Noreturn" would cause this declaration to be rewritten
+   to the invalid
+     void __cdecl abort (void) __attribute__ ((__attribute__ ((__noreturn__))));
+
+   Instead, define noreturn to empty, so that such declarations are rewritten to
+     __declspec () void abort (void);
+   or
+     void __cdecl abort (void) __attribute__ (());
+   respectively.  This gives up on noreturn's advice to the compiler but at
+   least it is valid code.  */
+# define noreturn /*empty*/
+#else
+# define noreturn _Noreturn
+#endif
+
+/* Did he ever return?
+   No he never returned
+   And his fate is still unlearn'd ...
+     -- Steiner J, Hawes BL.  M.T.A. (1949)  */
+
+#endif /* noreturn */