Richard M. Stallman

GCC 8.0 GNU Compiler Collection Internals 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 the compilers (GCC) version 8.0.1. The use of the GNU compilers is documented in a separate manual. See Section "Introduction" in Using the GNU Compiler Collection (GCC). This manual is mainly a reference manual rather than a tutorial. It discusses how to contribute to GCC (see Chapter 1 Contributing], page 3), the characteristics of the machines supported by GCC as hosts and targets (see Chapter 2 Portability], page 5), how GCC relates to the ABIs on such systems (see Chapter 3 Interface], page 7), and the characteristics of the languages for which GCC front ends are written (see Chapter 5 Languages], page 59). 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. This manual is available online for free at gnu.org. This manual is printed in grayscale.

You can get a free PDF version of this 1156-page document at gnu.org. This images and text in this document are printed in grayscale.The C language provides no built-in facilities for performing such common operations as input/output, memory management, string manipulation, and the like. Instead, these facilities are defined in a standard library, which you compile and link with your programs.The GNU C Library, described in this document, defines all of the library functions that are specified by the ISO C standard, as well as additional features specific to POSIX and other derivatives of the Unix operating system, and extensions specific to GNU systems.The purpose of this manual is to explain how to use the facilities of the GNU C Library. We have mentioned which features belong to which standards to help you identify things that are potentially non-portable to other systems. But the emphasis in this manual is not on strict portability.

The make utility automatically determines which pieces of a large program need to be recompiled, and issues commands to recompile them. This manual describes GNU make, which was implemented by Richard Stallman and Roland McGrath. This book is available as a free PDF from gnu.org.The Make program is indispensable to maintainers of free software systems. The GNU Make manual, written by the program's original authors, is the definitive tutorial. It also includes an introductory chapter for novice users. The Make utility automates the process of compilation; it is especially useful when the source files of large programs change. It is a small program with a lot of power. This book will show you: How to write your own makefiles Make's rule syntax and how to write your own rules How the Make utility can be configured to automatically put binary and source files in the right places. How to use make to create archive files automatically Define, set and use Make's variables How Make uses targets so that you can broaden or narrow Make's recompilation efforts on demand. And much more This manual provides a complete explanation of Make, both the basics and extended features.

The C preprocessor, often known as cpp, is a macro processor that is used automatically by the C compiler to transform your program before compilation. It is called a macro processor because it allows you to define macros, which are brief abbreviations for longer constructs. The C preprocessor is intended to be used only with C, C++, and Objective-C source code. In the past, it has been abused as a general text processor. It will choke on input which does not obey C's lexical rules. For example, apostrophes will be interpreted as the beginning of character constants, and cause errors. Also, you cannot rely on it preserving characteristics of the input which are not significant to C-family languages. If a Makefile is preprocessed, all the hard tabs will be removed, and the Makefile will not work.

For GNU Make Version 4.1 The Make program is indispensable to maintainers of free software systems. The GNU Make manual, written by the program's original authors, is the definitive tutorial. It also includes an introductory chapter for novice users. The Make utility automates the process of compilation; it is especially useful when the source files of large programs change. It is a small program with a lot of power. This book will show you: How to write your own makefiles Make's rule syntax and how to write your own rules How the Make utility can be configured to automatically put binary and source files in the right places. How to use make to create archive files automatically Define, set and use Make's variables How Make uses targets so that you can broaden or narrow Make's recompilation efforts on demand. And much more This manual provides a complete explanation of Make, both the basics and extended features. There is also a convenient Quick Reference appendix for experts.