@section @code{ceil}
@findex ceil
-POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/ceil.html}
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/ceil.html}
-Gnulib module: ceil
+Gnulib module: ceil or ceil-ieee
-Portability problems fixed by Gnulib:
+Portability problems fixed by either Gnulib module @code{ceil} or @code{ceil-ieee}:
@itemize
@end itemize
+Portability problems fixed by Gnulib module @code{ceil-ieee}:
+@itemize
+@item
+This function returns a positive zero for an argument between @minus{}1 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