Creating and Using Libraries

Version Control with Shared Libraries

Specifying a Version Date

When adding modules to a library for a particular release of the library, it is best to give all modules the same version date. For example, if you complete file1.o on 04/93, file2.o on 05/93, and file3.o on 07/93, it would be best to give all the modules the same version date, say 07/93.

The reason for doing this is best illustrated with an example. Suppose in the previous example you gave each module a version date corresponding to the date it was completed: 04/93 for file1.o, 05/93 for file2.o, and 07/93 for file3.o. You then build the final library on 07/93 and link an application a.out with the library. Now suppose that you introduce an incompatible change to function foo found in file1.o, set the version date to 05/93, and rebuild the library. If you run a.out with the new version of the library, a.out will get the new, incompatible version of foo because its version date is still earlier than the date the application was linked with the original library!

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Kenwood HP 9000 manual Specifying a Version Date

HP 9000 specifications

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