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BFD is a package which allows applications to use the same routines to
operate on object files whatever the object file format.  A new object
file format can be supported simply by creating a new BFD back end and
adding it to the library.
   BFD is split into two parts: the front end, and the back ends (one
for each object file format).
   * The front end of BFD provides the interface to the user. It manages
     memory and various canonical data structures. The front end also
     decides which back end to use and when to call back end routines.
   * The back ends provide BFD its view of the real world. Each back
     end provides a set of calls which the BFD front end can use to
     maintain its canonical form. The back ends also may keep around
     information for their own use, for greater efficiency.