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Linker and Libraries Guide     Oracle Solaris 11 Information Library
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Document Information


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

5.  Interfaces and Versioning

6.  Establishing Dependencies with Dynamic String Tokens

Part II Quick Reference

7.  Link-Editor Quick Reference

8.  Versioning Quick Reference

Part III Advanced Topics

9.  Direct Bindings

10.  Mapfiles

11.  Extensibility Mechanisms

Part IV ELF Application Binary Interface

12.  Object File Format

File Format

Data Representation

ELF Header

ELF Identification

Data Encoding


Section Merging

Special Sections

COMDAT Section

Group Section

Capabilities Section

Hash Table Section

Move Section

Note Section

Relocation Sections

Relocation Calculations

SPARC: Relocations

SPARC: Relocation Types

64-bit SPARC: Relocation Types

x86: Relocations

32-bit x86: Relocation Types

x64: Relocation Types

String Table Section

Symbol Table Section

Symbol Values

Symbol Table Layout and Conventions

Symbol Sort Sections

Register Symbols

Syminfo Table Section

Versioning Sections

Version Definition Section

Version Dependency Section

Version Symbol Section

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


Section Merging

The SHF_MERGE section flag can be used to mark SHT_PROGBITS sections within relocatable objects. See Table 12-8. This flag indicates that the section can be merged with compatible sections from other objects. Such merging has the potential to reduce the size of any executable or shared object that is built from these relocatable objects. This size reduction can also have a positive effect on the runtime performance of the resulting object.

A SHF_MERGE flagged section indicates that the section adheres to the following characteristics.

SHF_MERGE is an optional flag indicating a possible optimization. The link-editor is allowed to perform the optimization, or to ignore the optimization. The link-editor creates a valid output object in either case. The link-editor presently implements section merging only for sections containing string data marked with the SHF_STRINGS flag.

When the SHF_STRINGS section flag is set in conjunction with the SHF_MERGE flag, the strings in the section are available to be merged with strings from other compatible sections. The link-editor merges such sections using the same string compression algorithm as used to compress the SHT_STRTAB string tables, .strtab and .dynstr.

The link-editor currently implements string merging only for strings that consist of byte sized characters that do not have special alignment constraints. Specifically, the following section characteristics are required.

Note - Any string table compression can be suppressed with the link-editors -z nocompstrtab option.