Mercurial > gnulib
view doc/posix-functions/isnan.texi @ 40246:c34f677e6117 default tip master
_Noreturn: GCC 4.7 does not support [[noreturn]] in C++11 mode
* lib/_Noreturn.h, m4/gnulib-common.m4: Don't use [[noreturn]] before
GCC 4.8.
author | Akim Demaille <akim.demaille@gmail.com> |
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date | Sun, 17 Mar 2019 19:27:20 +0100 |
parents | 73d60b1f9c96 |
children |
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@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 11.4. @item This macro does not work on some platforms: MSVC 14. @item On IRIX 6.5 with @code{cc}, @code{isnan} does not recognize some NaNs. @end itemize Portability problems not fixed by Gnulib: @itemize @item This macro returns an unspecified result when given noncanonical values such as unnormalized numbers, pseudo-denormals, pseudo-NaNs, pseudo-Infinities, and pseudo-zeroes. @end itemize