NOTE

Creating and Using Libraries

Version Control with Shared Libraries

Version Control with Shared Libraries

HP-UX provides two ways to support incompatible versions of shared library routines. “Library-Level Versioning” describes how you create multiple versions of a shared library. “Intra-Library Versioning” describes how a single shared library can have multiple versions of an object module. Library-level versioning is recommended over intra-library versioning.

Beginning with HP-UX Release 11.00, the 64-bit linker toolset supports only library-level versioning.

When to Use Shared Library Versioning

For the most part, updates to a shared library should be completely upward-compatible; that is, updating a shared library won't usually cause problems for programs that use the library. But sometimes — for example, if you add a new parameter to a routine — updates cause undesirable side-effects in programs that call the old version of the routine. In such cases, it is desirable to retain the old version as well as the new. This way, old programs will continue to run and new programs can use the new version of the routine.

Here are some guidelines to keep in mind when making changes to a library:

•When creating the first version of a shared library, carefully consider whether or not you will need versioning. It is easier to use library-level versioning from the start.

When creating the first version of a shared library using intra-library versioning, version control is not an issue: The default version number is satisfactory.

•When creating future revisions of a library, you must determine when a change represents an incompatible change, and thus deserves a new version. Some examples of incompatible changes are as follows:

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Kenwood HP 9000 manual Version Control with Shared Libraries, When to Use Shared Library Versioning
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