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FreeBSD and Cygwin #define _Noreturn to empty if 'lint' is defined. Problem reported by Ken Brown in: http://bugs.gnu.org/23640 * doc/posix-headers/stdnoreturn.texi (stdnoreturn.h): Document problem with lint and _Noreturn. * lib/diffseq.h (IF_LINT, IF_LINT2): * lib/fts.c (sccsid): * lib/getndelim2.c (IF_LINT): * lib/gl_anylinked_list2.h (gl_linked_iterator) (gl_linked_iterator_from_to): * lib/gl_anytree_list2.h (gl_tree_iterator) (gl_tree_iterator_from_to): * lib/gl_anytree_oset.h (gl_tree_iterator): * lib/gl_array_list.c (gl_array_iterator) (gl_array_iterator_from_to): * lib/gl_array_oset.c (gl_array_iterator): * lib/gl_carray_list.c (gl_carray_iterator) (gl_carray_iterator_from_to): * lib/idcache.c: * lib/inet_ntop.c (IF_LINT): * lib/regcomp.c (build_charclass_op, create_tree): * lib/regex_internal.c (re_acquire_state) (re_acquire_state_context): * lib/trigl.c (rcsid): * lib/trim.c (IF_LINT): * lib/vasnprintf.c (IF_LINT): * lib/verify.h (assume): Treat GCC_LINT like lint.
43 lines
1.5 KiB
Plaintext
43 lines
1.5 KiB
Plaintext
@node stdnoreturn.h
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@section @file{stdnoreturn.h}
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POSIX specification:@* Not in POSIX yet, but we expect it will be.
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ISO C11 (latest free draft
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@url{http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf})
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sections 7.23.
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Gnulib module: stdnoreturn
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This header file is missing on most circa-2012 platforms.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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@code{<stdnoreturn.h>} should be #included before @samp{_Noreturn} is used.
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@item
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You cannot assume that @code{_Noreturn} is a reserved word;
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it might be a macro.
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@item
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When the macro @code{lint} is defined, standard headers define
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@code{_Noreturn} (and therefore @code{noreturn}) to be a macro that
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expands to the empty token sequence on some platforms:
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Cygwin 2.5.1, FreeBSD 10.3.
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@item
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On MSVC 9, @code{noreturn} expands to the empty token sequence, to avoid
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problems with standard headers that use @code{__declspec (noreturn)}
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directly. Although the resulting code operates correctly, the
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compiler is not informed whether @code{noreturn} functions do not
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return, so it may generate incorrect warnings at compile-time, or code
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that is slightly less optimized. This problem does not occur with
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@code{_Noreturn}.
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@item
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Circa 2012 bleeding-edge GCC with @code{-Werror=old-style-declaration}
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requires @code{_Noreturn} or @code{noreturn} before the returned type
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in a declaration, and therefore rejects valid but unusually-worded
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declarations such as @code{void _Noreturn foo (void);}.
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@end itemize
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