6.19 acoshf

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

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This function is missing on some platforms: AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 9, mingw.