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 4.1.2. The use of the GNU compilers is documented in a separate manual. ⇒ Introduction (gcc)Top. This manual is mainly a reference manual rather than a tutorial. It discusses how to contribute to GCC (⇒Contributing), the characteristics of the machines supported by GCC as hosts and targets (⇒Portability), how GCC relates to the ABIs on such systems (⇒Interface), and the characteristics of the languages for which GCC front ends are written (⇒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. · Libgcc Low-level runtime library used by GCC. · Languages Languages for which GCC front ends are written. · Source Tree GCC source tree structure and build system. · Options Option specification files. · 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. · Control Flow Maintaining and manipulating the control flow graph. · Tree SSA Analysis and optimization of the tree representation. · 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. · Type Information GCC's memory management; generating type information. · 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. · Concept Index Index of concepts and symbol names.