[Bug libstdc++/50880] __complex_acosh() picks wrong complex branch

[kreckel at ginac dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50880

--- Comment #1 from Richard B. Kreckel <kreckel at ginac dot de> 2011-10-27 
07:12:12 UTC ---
Created attachment 25623
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25623
patch to fix the bug