Creating and Using Libraries

Creating Shared Libraries

libP libA libD libQ libB → <current search list>

Updating a Shared Library

The ld command cannot replace or delete object modules in a shared library. Therefore, to update a shared library, you must relink the library with all the object files you want the library to include. For example, suppose you fix some routines in length.c (from the previous section) that were giving incorrect results. To update the libunits.sl library to include these changes, you would use this series of commands:

$ cc -Aa -c +z length.c

$ ld -b -o libunits.sl length.o volume.o mass.o

Any programs that use this library will now be using the new versions of the routines. That is, you do not have to relink any programs that use this shared library. This is because the routines in the library are attached to the program at run time.

This is one of the advantages of shared libraries over archive libraries: if you change an archive library, you must relink any programs that use the archive library. With shared libraries, you need only recreate the library.

Incompatible Changes to a Shared Library

If you make incompatible changes to a shared library, you can use library versioning to provide both the old and the new routines to ensure that programs linked with the old routines continue to work. See “Version Control with Shared Libraries” for more information on version control of shared libraries.

Shared Library Location

You can place shared libraries in the same locations as archive libraries (see “Archive Library Location”). Again, this is typically /usr/local/lib and /usr/contrib/lib (32-bit mode) or /user/local/lib/pa20_64 and /usr/contrib/lib/pa20_64 (64 bit mode) for application libraries, and /usr/lib (32-bit mode) or /user/lib/pa20_64 (64-bit mode) for system libraries. However, these are just suggestions.

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Chapter 5

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Kenwood HP 9000 manual Updating a Shared Library, Shared Library Location, Incompatible Changes to a Shared Library, 144

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