kc3-lang/gnulib/doc/posix-functions/isnan.texi

• Show log

  Commit

• Hash : 1b5bc6ed
  Author :
  Date : 2010-12-20T03:28:45
  

  isnan: Ensure it is a macro.
  
  * lib/math.in.h (isnan): Define as a macro if not already a macro.
  * doc/posix-functions/isnan.texi: Mention problem on IRIX, OSF/1,
  Solaris.
  

Download

• doc/posix-functions/isnan.texi

• @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
  @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
  

Download