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Introduction
************

   This manual documents the internals of the GNU compilers, including
how to port them to new targets and some information about how to write
front ends for new languages.  It corresponds to GCC version 3.2.3.
The use of the GNU compilers is documented in a separate manual.  *Note
Introduction: (gcc)Top.

   This manual is mainly a reference manual rather than a tutorial.  It
discusses how to contribute to GCC (Note: Contributing), the
characteristics of the machines supported by GCC as hosts and targets
(Note: Portability), how GCC relates to the ABIs on such systems
(Note: Interface), and the characteristics of the languages for which
GCC front ends are written (Note: Languages).  It then describes the
GCC source tree structure and build system, some of the interfaces to
GCC front ends, and how support for a target system is implemented in
GCC.

   Additional tutorial information is linked to from
`http://gcc.gnu.org/readings.html'.

Contributing

How to contribute to testing and developing GCC.

Portability

Goals of GCC's portability features.

Interface

Function-call interface of GCC output.

Languages

Languages for which GCC front ends are written.

Source Tree

GCC source tree structure and build system.

Passes

Order of passes, what they do, and what each file is for.

Trees

The source representation used by the C and C++ front ends.

RTL

The intermediate representation that most passes work on.

Machine Desc

How to write machine description instruction patterns.

Target Macros

How to write the machine description C macros and functions.

Host Config

Writing the `xm-MACHINE.h' file.

Fragments

Writing the `t-TARGET' and `x-HOST' files.

Collect2

How `collect2' works; how it finds `ld'.

Header Dirs

Understanding the standard header file directories.

Funding

How to help assure funding for free software.

GNU Project

The GNU Project and GNU/Linux.

Copying

GNU General Public License says how you can copy and share GCC.

GNU Free Documentation License

How you can copy and share this manual.

Contributors

People who have contributed to GCC.

Option Index

Index to command line options.

Index

Index of concepts and symbol names.