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Each design unit analyzed is placed into a design library. By default, the name of this design library is ‘work’; however, this can be changed with the --work=NAME option of GHDL.
To keep the list of design units in a design library, GHDL creates library files. The name of these files is ‘NAME-objVER.cf’, where NAME is the name of the library, and VER the VHDL version (87 or 93) used to analyze the design units.
You don't have to know how to read a library file. You can display it
using the -d of ghdl. The file contains the name of the
design units, as well as the location and the dependencies.
The format may change with the next version of GHDL.