@node exp2l
@section @code{exp2l}
@findex exp2l

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/exp2l.html}

Gnulib module: exp2l or exp2l-ieee

Portability problems fixed by either Gnulib module @code{exp2l} or @code{exp2l-ieee}:
@itemize
@item
This function is missing on some platforms:
FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, older IRIX 6.5, Solaris 9, Cygwin 1.7.x, MSVC 9, Android 4.4.
@item
This function is not declared on some platforms:
IRIX 6.5.
@item
This function produces results which are accurate to only 16 digits on some
platforms:
NetBSD 9.0.
@end itemize

Portability problems fixed by Gnulib module @code{exp2l-ieee}:
@itemize
@item
This function returns a wrong value for a NaN argument on some platforms:
OpenBSD 4.9.
@item
This function returns a wrong value for a negative infinity argument on some platforms:
IRIX 6.5.
@end itemize

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