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HP-UX Linker and Libraries User's Guide: HP 9000 Computers

Chapter 5 Creating and Using Libraries

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Table of Contents

Overview of Shared and Archive Libraries

What are Archive Libraries?

Example

What are Shared Libraries?

The Dynamic Loader dld.sl
Default Behavior When Searching for Libraries at Run Time
Caution on Using Dynamic Library Searching

Example Program Comparing Shared and Archive Libraries

Shared Libraries with Debuggers, Profilers, and Static Analysis

Creating Archive Libraries

Overview of Creating an Archive Library
Contents of an Archive File
Example of Creating an Archive Library
Replacing, Adding, and Deleting an Object Module
Summary of Keys to the ar(1) Command
crt0.o
Archive Library Location

Creating Shared Libraries

Creating Position-Independent Code (PIC)
Creating the Shared Library with ld
Shared Library Dependencies
Updating a Shared Library
Shared Library Location
Improving Shared Library Performance

Version Control with Shared Libraries

When to Use Shared Library Versioning
Maintaining Old Versions of Library Modules
Library-Level Versioning
Intra-Library Versioning

Switching from Archive to Shared Libraries

Library Path Names
Relying on Undocumented Linker Behavior
Absolute Virtual Addresses
Stack Usage
Version Control
Debugger Limitations
Using the chroot Command with Shared Libraries
Profiling Limitations

Summary of HP-UX Libraries

Caution When Mixing Shared and Archive Libraries

Example 1: Unsatisfied Symbols
Example 2: Using shl_load(3X)
Example 3: Hidden Definitions
Summary of Mixing Shared and Archive Libraries

Using Shared Libraries in 64-bit mode

Internal Name Processing
Dynamic Path Searching for Shared Libraries
Shared Library Symbol Binding Semantics
Mixed Mode Shared Libraries
64-bit Mode Library Examples

Many libraries come with HP-UX. You can also create and use your own libraries on HP-UX. This chapter provides information on the following topics:

General Information about Shared and Archive Libraries

Creating Libraries on HP-UX
- “Creating Shared Libraries”
- “Creating Archive Libraries”

Using Libraries on HP-UX
Using Shared Libraries in 64-bit Mode

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