Creating and Using Libraries

Version Control with Shared Libraries

1.Name the first version of your shared library with an extension of .0 (that's the number zero), for example libA.0. Use the +h option to designate the internal name of the library, for example, libA.0:

ld -b *.o -o libA.0 +h libA.0

Creates the shared library libA.0.

2.Since the linker still looks for libraries ending in .sl with the -loption, create a symbolic link from the usual name of the library ending in .sl to the actual library. For example, libA.sl points to libA.0:

ln -s libA.0 libA.sl

libA.sl is a symbolic link to libA.0.

3.Link applications as usual, using the -loption to specify libraries. The linker searches for libA.sl, as usual. However, if the library it finds has an internal name, the linker places the internal name of the library in the executable's shared library dependency list. When you run the application, the dynamic loader loads the library named by this internal name. For example:

ld /opt/langtools/lib/crt0.o prog.o -lA -lc Binds a.out with libA.0.

Creating a New, Incompatible Version of the Library

When you create a new version of the library with incompatible changes, repeat the above steps except increment the number in the suffix of the shared library file name. That is, create libA.1 rather than libA.0 and set the symbolic link libA.sl to point to libA.1. Applications linked with libA.0 continue to run with that library while new applications link and run with libA.1. Continue to increment the suffix number for subsequent incompatible versions, for example libA.2, libA.3, and so forth.

Migrating an Existing Library to Use Library-Level Versioning

If you have an existing library you can start using library-level versioning. First rename the existing library to have the extension .0. Then create the new version of the library with the extension .1 and an internal name using the .1 extension. Create a symbolic link with the extension .sl to point to the .1 library.

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Kenwood HP 9000 manual Creating a New, Incompatible Version of the Library
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