@node roundf
@section @code{roundf}
@findex roundf

POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/roundf.html}

Gnulib module: roundf or roundf-ieee

Portability problems fixed by either Gnulib module @code{roundf} or @code{roundf-ieee}:
@itemize
@item
This function is missing on some platforms:
FreeBSD 5.2.1, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, older IRIX 6.5, OSF/1 4.0, Solaris 9, MSVC 9, Interix 3.5.
@item
This function is not declared on some platforms:
glibc 2.8, IRIX 6.5, OSF/1 5.1.
@item
This functions returns a wrong result for @math{x = 1/2 - 2^-25}
on some platforms:
mingw.
@end itemize

Portability problems fixed by Gnulib module @code{roundf-ieee}:
@itemize
@item
This function returns a positive zero for an argument between @minus{}0.5 and 0
on some platforms:
AIX 7.1, OSF/1 5.1.
@item
This function returns a positive zero for a minus zero argument
on some platforms:
OSF/1 5.1.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@end itemize