2011-11-02 Richard B. Kreckel <kreckel@ginac.de>
Paolo Carlini <paolo.carlini@oracle.com>
PR libstdc++/50880
* include/std/complex (__complex_acosh): Fix in a better way,
use Kahan's formula.
* include/tr1/complex (__complex_acosh): Likewise.
From-SVN: r180787