Binary package “gdb64” in ubuntu-rtm 14.09
GNU Debugger (64-bit)
GDB is a source-level debugger, capable of breaking programs at
any specific line, displaying variable values, and determining
where errors occurred. Currently, gdb supports C, C++, D,
Objective-C, Fortran, Java, OpenCL C, Pascal, assembly, Modula-2,
Go, and Ada. A must-have for any serious programmer.
.
This package contains a version of GDB compiled for a 64-bit variant
of its architecture.