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This file documents GNU Libtool, a script that allows package developers to provide generic shared library support. This edition documents version 1.4.3.

See section 12.2 Reporting bugs, for information on how to report problems with libtool.

1. Introduction  What the heck is libtool?
2. The libtool paradigm  How libtool's view of libraries is different.
3. Using libtool  Example of using libtool to build libraries.
4. Invoking libtool  Running the libtool script.
5. Integrating libtool with your package  Using libtool in your own packages.
6. Library interface versions  Using library interface versions.
7. Tips for interface design  Tips for library interface design.
8. Inter-library dependencies  Libraries that depend on other libraries.
9. Dlopened modules  dlopening libtool-created libraries.
10. Using libltdl  Libtool's portable dlopen wrapper library.
11. Using libtool with other languages  Using libtool without a C compiler.
12. Troubleshooting  When libtool doesn't work as advertised.
13. Maintenance notes for libtool  Information used by the libtool maintainer.
GNU Free Documentation License  License for this manual.
Index  Full index.


1.1 Motivation for writing libtool  Why does GNU need a libtool?
1.2 Implementation issues  The problems that need to be addressed.
1.3 Other implementations  How other people have solved these issues.
1.4 A postmortem analysis of other implementations  Learning from past difficulties.

Using libtool

3.1 Creating object files  Compiling object files for libraries.
3.2 Linking libraries  Creating libraries from object files.
3.3 Linking executables  Linking object files against libtool libraries.
3.4 Debugging executables  Running GDB on libtool-generated programs.
3.5 Installing libraries  Making libraries available to users.
3.6 Installing executables  Making programs available to users.
3.7 Linking static libraries  When shared libraries are not wanted.

Invoking libtool

4.1 Compile mode  Creating library object files.
4.2 Link mode  Generating executables and libraries.
4.3 Execute mode  Debugging libtool-generated programs.
4.4 Install mode  Making libraries and executables public.
4.5 Finish mode  Completing a library installation.
4.6 Uninstall mode  Removing installed executables and libraries.
4.7 Clean mode  Removing uninstalled executables and libraries.

Integrating libtool with your package

5.1 Writing `Makefile' rules for libtool  
5.2 Using Automake with libtool  Automatically supporting libtool.
5.3 Configuring libtool  Configuring libtool for a host system.
5.4 Including libtool in your package  What files to distribute with your package.
5.5 Static-only libraries  Sometimes shared libraries are just a pain.

Configuring libtool

5.3.1 The AC_PROG_LIBTOOL macro  Configuring libtool in `configure.in'.

Including libtool in your package

5.4.1 Invoking libtoolize  libtoolize command line options.
5.4.2 Autoconf `.o' macros  Autoconf macros that set object file names.

Library interface versions

6.1 What are library interfaces?  
6.2 Libtool's versioning system  
6.3 Updating library version information  Changing version information before releases.
6.4 Managing release information  Breaking binary compatibility for aesthetics.

Tips for interface design

7.1 Writing C header files  How to write portable include files.

Dlopened modules

9.1 Building modules to dlopen  Creating dlopenable objects and libraries.
9.2 Dlpreopening  Dlopening that works on static platforms.
9.3 Finding the correct name to dlopen  Choosing the right file to dlopen.
9.4 Unresolved dlopen issues  Unresolved problems that need your attention.

Using libltdl

10.1 How to use libltdl in your programs  
10.2 Creating modules that can be dlopened  
10.3 Using libtldl in a multi threaded environment  Registering callbacks for multi-thread safety.
10.4 Data associated with loaded modules  Associating data with loaded modules.
10.5 How to create and register new module loaders  Creating user defined module loaders.
10.6 How to distribute libltdl with your package  

Using libtool with other languages

11.1 Writing libraries for C++  


12.1 The libtool test suite  Libtool's self-tests.
12.2 Reporting bugs  How to report problems with libtool.

The libtool test suite

12.1.1 Description of test suite  The contents of the test suite.
12.1.2 When tests fail  What to do when a test fails.

Maintenance notes for libtool

13.1 Porting libtool to new systems  How to port libtool to new systems.
13.2 Tested platforms  When libtool was last tested.
13.3 Platform quirks  Information about different library systems.
13.4 libtool script contents  Configuration information that libtool uses.
13.5 Cheap tricks  Making libtool maintainership easier.

Porting libtool to new systems

13.1.1 Information sources  Where to find relevant documentation
13.1.2 Porting inter-library dependencies support  Implementation details explained

Platform quirks

13.3.1 References  Finding more information.
13.3.2 Compilers  Creating object files from source files.
13.3.3 Reloadable objects  Binding object files together.
13.3.4 Multiple dependencies  Removing duplicate dependant libraries.
13.3.5 Archivers  Programs that create static archives.

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