http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50423
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-09-15 18:01:34 UTC --- This is expected you are not including unistd.h in your source which is required if you want to use getpid. It was a bug before GCC 4.7 that some of the C++ headers included that header file.