Creating and Using Libraries

Version Control with Shared Libraries

When you run a program that uses shared libraries and was linked before HP-UX 10.0, the dynamic loader first attempts to open the shared library ending in .0. If it cannot find that library, it attempts to open the library ending in .sl.

The +h Option and Internal Names

The +h option gives a library an internal name for library-level versioning. Use +h to create versioned libraries:

+h internal_name

internal_name is typically the same name as the library file itself, for example libA.1 as in +h libA.1. When you link with a library that has an internal name, the linker puts the internal_name in the shared library dependency list of the executable or shared library being created. When running the resulting executable or shared library, it is the library named by this internal name that the dynamic loader loads.

You can include a relative or absolute path with the internal name, but you must ensure the dynamic loader can find the library from this name using its normal search process.

For 32-bit mode, if internal_name includes a relative path (that is, a path not starting with /), the internal name stored by the linker is the concatenation of the actual path where the library was found and internal_name, including the relative path. When the resulting program is run, if the dynamic loader cannot find the library at this location, the program will not run.

If internal_name includes an absolute path (that is, a path starting with /), the internal name stored by the linker is simply the internal_name, including the absolute path. When the resulting program is run, if the dynamic loader cannot find the library at this location, the program will not run.

For 64-bit mode, see “Internal Name Processing” for more information.

File System Links to Shared Libraries

This section discusses the situation where you have used the ln(1) command to create file system links to shared library files. For example:

$ ld

-b

-o /X/libapp.sl *.o

Create shared library.

$ ln

-s

/X/libapp.sl /tmp/libmine.sl

Make the link.

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HP 9000 specifications

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