9.220 exp2l

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/exp2l.html

Gnulib module: exp2l or exp2l-ieee

Portability problems fixed by either Gnulib module exp2l or exp2l-ieee:

• 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, OSF/1 4.0, Solaris 9, Cygwin, MSVC 9, Interix 3.5, BeOS.
• This function is not declared on some platforms: IRIX 6.5.

Portability problems fixed by Gnulib module exp2l-ieee:

• This function returns a wrong value for a NaN argument on some platforms: OpenBSD 4.9.
• This function returns a wrong value for a negative infinity argument on some platforms: IRIX 6.5.

Portability problems not fixed by Gnulib: