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Diffstat (limited to 'gnulib/doc/posix-functions/isnan.texi')
| m--------- | gnulib | 0 | ||||
| -rw-r--r-- | gnulib/doc/posix-functions/isnan.texi | 35 |
2 files changed, 35 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1 diff --git a/gnulib/doc/posix-functions/isnan.texi b/gnulib/doc/posix-functions/isnan.texi new file mode 100644 index 0000000..7d23a3a --- /dev/null +++ b/gnulib/doc/posix-functions/isnan.texi @@ -0,0 +1,35 @@ +@node isnan +@section @code{isnan} +@findex isnan + +POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/isnan.html} + +Gnulib module: isnan + +Portability problems fixed by Gnulib: +@itemize +@item +This macro is missing on some platforms: +MSVC 9. +@item +@code{isnan} was introduced with C99 and is thus commonly not present +on pre-C99 systems. +@item +@code{isnan} is not a macro on some platforms: +IRIX 6.5, OSF/1 5.1 with gcc, Solaris 11 2010-11. +@item +On IRIX 6.5 with @code{cc}, @code{isnan} does not recognize some NaNs. +@item +On NetBSD/i386 and glibc/ia64, @code{isnan} does not recognize some +forms of NaNs, such as pseudo-NaNs, pseudo-Infinities, and +unnormalized numbers. +@item +On i686 and @var{x}86-64, @code{__builtin_isnanl} (and thus +@code{isnan} implementations based on it) in GCC 4.0 and later does +not recognize pseudo-denormals as NaNs, and similarly for +pseudo-zeroes, unnormalized numbers, and pseudo-denormals on ia64. +@end itemize + +Portability problems not fixed by Gnulib: +@itemize +@end itemize |