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Problem reported by David Seifert in: http://lists.gnu.org/archive/html/bug-gnulib/2016-06/msg00005.html * NEWS, doc/posix-headers/stdbool.texi (stdbool.h): Document this. * m4/stdbool.m4 (AC_CHECK_HEADER_STDBOOL): Make the check more-forgiving for C++, in that it requires only 'bool'. Be a bit stricter about checking that bool and _Bool are compatible in C.
38 lines
1.2 KiB
Plaintext
38 lines
1.2 KiB
Plaintext
@node stdbool.h
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@section @file{stdbool.h}
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/basedefs/stdbool.h.html}
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Gnulib module: stdbool
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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 some platforms:
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AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1.
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@item
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Some compilers have bugs relating to @samp{bool}.
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@item
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This header file defines @code{true} incorrectly on some platforms:
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OpenBSD 4.7 with gcc 2.95.
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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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@samp{_Bool} cannot be used before @code{<stdbool.h>} is included, or if
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the program is intended to be compiled by a C++ compiler.
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@item
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You cannot assume that @code{_Bool} is a typedef; it might be a macro.
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@item
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Bit-fields of type @samp{bool} are not supported. Portable code
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should use @samp{unsigned int foo : 1;} rather than @samp{bool foo : 1;}.
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@item
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Casts and automatic conversions to @samp{bool} don't test against the
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zero value or the null pointer, as they should. Such casts should only
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be used if the value is known to be equal to 0 or 1.
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@item
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You cannot assume that casting a floating point literal to @samp{bool} will
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result in a constant expression.
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@end itemize
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