Creating and Using Libraries

Creating Shared Libraries

Prior to the HP-UX 9.0 release, moving a shared library caused any programs that were linked with the library to fail when they tried to load the library. Prior to 9.0, you were required to relink all applications that used the library if the library was moved to a different directory.

Beginning with the HP-UX 9.0 release, a program can search a list of directories at run time for any required libraries. Thus, libraries can be moved after an application has been linked with them. To search for libraries at run time, a program must know which directories to search. There are two ways to specify this directory search information:

Store a directory path list in the program with the linker option +b path_list.

Link the program with +s, enabling the program to use the path list defined by the SHLIB_PATH environment variable at run time.

For 64-bit programs, you can also use the LD_LIBRARY_PATH environment variable, and the +s option is enabled by default.

For details on the use of these options, refer to “Moving Libraries after Linking with +b” on page 84 and “Moving Libraries After Linking with +s and SHLIB_PATH” on page 86.

Improving Shared Library Performance

This section describes methods you can use to improve the run-time performance of shared libraries. If, after using the methods described here, you are still not satisfied with the performance of your program with shared libraries, try linking with archive libraries instead to see if it improves performance. In general, though, archive libraries will not provide great performance improvements over shared libraries.

Using Profile-Based Optimization on Shared Libraries

You can perform profile-based optimization on your shared libraries to improve their performance. See “Profile-Based Optimization” on page 274 for more information.

Exporting Only the Required Symbols

Normally, all global variables and procedure definitions are exported from a shared library. In other words, any procedure or variable defined in a shared library is made visible to any code that uses this library. In addition, the compilers generate “internal” symbols that are exported.

Chapter 5

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Kenwood HP 9000 manual Improving Shared Library Performance, Using Profile-Based Optimization on Shared Libraries

HP 9000 specifications

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