http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56946
Jie Zhang <jiez at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |jiez at gcc dot gnu.org Resolution| |INVALID --- Comment #2 from Jie Zhang <jiez at gcc dot gnu.org> 2013-04-13 13:10:43 UTC --- You need to add -lm to your command line. cos(0) is OK because gcc optimizes it away when compiling.