Creating and Using Libraries

Version Control with Shared Libraries

•“Shared Library Dependencies and Version Control”

•“Adding New Versions to a Shared Library”

•“Specifying a Version Date”

The Version Number Compiler Directive

With intra-library versioning, you assign a version number to any module in a shared library. The version number applies to all global symbols defined in the module's source file. The version number is a date, specified with a compiler directive in the source file. The syntax of the version number directive depends on the language:

C and C++: #pragma HP_SHLIB_VERSION "date"

FORTRAN: $SHLIB_VERSION 'date'

Pascal: $SHLIB_VERSION 'date'$

The date argument in all three directives is of the form month/year. The month must be 1 through 12, corresponding to January through December. The year can be specified as either the last two digits of the year (94 for 1994) or a full year specification (1994). Two-digit year codes from 00 through 40 represent the years 2000 through 2040.

This directive should only be used if incompatible changes are made to a source file. If a version number directive is not present in a source file, the version number of all symbols defined in the object module defaults to 1/90.

Shared Library Dependencies and Version Control

A shared library as a whole can be thought of as having a version number itself. This version number is the most recent of the versioned symbols in the library and any dependent libraries.

When a shared library is built with a dependent shared library, the version number of the dependent library used during the link is recorded with the dependency.

When shl_load(3X) is called to load a shared library, the latest version of the library is loaded. If that library has dependencies, the dynamic loader (dld.sl(5)) will load the versions of the dependent libraries that were recorded in the dependency list. Note that these are not necessarily the most recent versions of the dependent libraries. When dld.sl loads a particular version of a shared library, it will load the same version of any dependent libraries.

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Kenwood HP 9000 manual Version Number Compiler Directive, Shared Library Dependencies and Version Control
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HP 9000 specifications

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