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Oracle Solaris 11.1 Linkers and Libraries Guide     Oracle Solaris 11.1 Information Library
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Document Information

Preface

Part I Using the Link-Editor and Runtime Linker

1.  Introduction to the Oracle Solaris Link Editors

2.  Link-Editor

3.  Runtime Linker

4.  Shared Objects

Naming Conventions

Recording a Shared Object Name

Inclusion of Shared Objects in Archives

Recorded Name Conflicts

Shared Objects With Dependencies

Dependency Ordering

Shared Objects as Filters

Generating Standard Filters

Generating Auxiliary Filters

Filtering Combinations

Filtee Processing

Part II Quick Reference

5.  Link-Editor Quick Reference

Part III Advanced Topics

6.  Direct Bindings

7.  Building Objects to Optimize System Performance

8.  Mapfiles

9.  Interfaces and Versioning

10.  Establishing Dependencies with Dynamic String Tokens

11.  Extensibility Mechanisms

Part IV ELF Application Binary Interface

12.  Object File Format

13.  Program Loading and Dynamic Linking

14.  Thread-Local Storage

Part V Appendices

A.  Linker and Libraries Updates and New Features

B.  System V Release 4 (Version 1) Mapfiles

Index

Dependency Ordering

When dynamic executables and shared objects have dependencies on the same common shared objects, the order in which the objects are processed can become less predictable.

For example, assume a shared object developer generates libfoo.so.1 with the following dependencies.

$ ldd libfoo.so.1
        libA.so.1 =>     ./libA.so.1
        libB.so.1 =>     ./libB.so.1
        libC.so.1 =>     ./libC.so.1

If you create a dynamic executable prog, using this shared object, and define an explicit dependency on libC.so.1, the resulting shared object order will be as follows.

$ cc -o prog main.c -R. -L. -lC -lfoo
$ ldd prog
        libC.so.1 =>     ./libC.so.1
        libfoo.so.1 =>   ./libfoo.so.1
        libA.so.1 =>     ./libA.so.1
        libB.so.1 =>     ./libB.so.1

Any requirement on the order of processing the shared object libfoo.so.1 dependencies would be compromised by the construction of the dynamic executable prog.

Developers who place special emphasis on symbol interposition and .init section processing should be aware of this potential change in shared object processing order.