Linker Tasks

Using Linker commands

• The program calls shl_definesym to define a symbol that is already defined in a library that was loaded at program startup.

If such a program is linked with -B immediate, references to symbols will be bound at program startup, regardless of whether duplicate symbols are created later by shl_load or shl_definesym.

But what happens when, to take advantage of the performance benefits of deferred binding, the same program is linked with -B deferred? If a duplicate, more visible symbol definition is created prior to referencing the symbol, it binds to the more visible definition, and the program might run incorrectly. In such cases, -B restricted is useful, because symbols bind the same way as they do with -B immediate, but actual binding is still deferred.

 

Improving Shared Library Performance with

 

-B symbolic

 

The linker supports the -B symbolic option which optimizes call paths

 

between procedures when building shared libraries. It does this by

 

building direct internal call paths inside a shared library. In linker

 

terms, import and export stubs are bypassed for calls within the

 

library.

 

A benefit of -B symbolic is that it can help improve application

 

performance and the resulting shared library will be slightly smaller.

 

The -B symbolic option is useful for applications that make a lot of

 

calls between procedures inside a shared library and when these same

 

procedures are called by programs outside of the shared library.

 

The -B symbolic option applies only to function, but not variable,

NOTE

 

references in a shared library.

 

Example Using -B symbolic

 

 

For example, to optimize the call path between procedures when building

 

a shared library called lib1.sl, use -B symbolic as follows:

 

$ ld -B symbolic -b func1.o func2.o -o lib1.sl

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Chapter 3

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Kenwood HP 9000 manual Improving Shared Library Performance with, Symbolic, Example Using -B symbolic

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