Creating and Using Libraries

Version Control with Shared Libraries

As a general rule, when an exported function is changed such that calls to the function from previously compiled object files should not resolve to the new version, the change is incompatible. If the new version can be used as a wholesale replacement for the old version, the change is compatible.

For exported data, any change in either the initial value or the size represents an incompatible change.

Any function that is changed to take advantage of an incompatible change in another module should be considered incompatible.

Maintaining Old Versions of Library Modules

When using shared library versioning, you need to save the old versions of modules in the library:

With library-level versioning, when an incompatible change is made to a module, the entire old version of the library must be retained along with the new version.

With intra-library versioning, when an incompatible change is made to a module, all the old versions of the module should be retained along with the new version. The new version number should correspond to the date the change was made. If several modules are changed incompatibly in a library, it is a good idea to give all modules the same version date.

Library-Level Versioning

HP-UX 10.0 adds a new library-level versioning scheme that allows you to maintain multiple versions of shared libraries when you make incompatible changes to the library. By maintaining multiple versions, applications linked with the older versions continue to run with the older libraries, while new applications link and run with the newest version of the library. Library-level versioning is very similar to the library versioning on UNIX System V Release 4.

How to Use Library-Level Versioning

To use library-level versioning, follow these steps:

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Kenwood HP 9000 manual Maintaining Old Versions of Library Modules, How to Use Library-Level Versioning, 150

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