os/linux/os_share_linux.hpp
os/bsd/os_share_bsd.hpp
os/windows/os_share_windows.hpp
os/aix/os_share_aix.hpp

These files contain 3 declarations that are never used in the code.

void handle_unexpected_exception(Thread* thread, int sig, siginfo_t* info, address pc, address adjusted_pc);
#ifndef PRODUCT
void continue_with_dump(void);
#endif
#define PROCFILE_LENGTH 128