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* doc/gnulib-intro.texi (Target Platforms): Classify MSVC as "rarely tested". * doc/posix-functions/*.texi: Update with info about MSVC 9. * doc/posix-headers/*.texi: Likewise. * doc/pastposix-functions/*.texi: Likewise. * doc/glibc-functions/*.texi: Likewise. * doc/glibc-headers/*.texi: Likewise.
36 lines
1.0 KiB
Plaintext
36 lines
1.0 KiB
Plaintext
@node isnan
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@section @code{isnan}
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@findex isnan
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/isnan.html}
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Gnulib module: isnan
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This macro is missing on some platforms:
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MSVC 9.
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@item
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@code{isnan} was introduced with C99 and is thus commonly not present
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on pre-C99 systems.
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@item
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@code{isnan} is not a macro on some platforms:
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IRIX 6.5, OSF/1 5.1 with gcc, Solaris 11 2010-11.
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@item
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On IRIX 6.5 with @code{cc}, @code{isnan} does not recognize some NaNs.
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@item
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On NetBSD/i386 and glibc/ia64, @code{isnan} does not recognize some
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forms of NaNs, such as pseudo-NaNs, pseudo-Infinities, and
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unnormalized numbers.
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@item
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On i686 and @var{x}86-64, @code{__builtin_isnanl} (and thus
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@code{isnan} implementations based on it) in GCC 4.0 and later does
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not recognize pseudo-denormals as NaNs, and similarly for
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pseudo-zeroes, unnormalized numbers, and pseudo-denormals on ia64.
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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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@end itemize
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