By Brian J. Gough, Richard M. Stallman

ISBN-10: 0954161793

ISBN-13: 9780954161798

I have been analyzing and utilizing this little publication for the earlier few weeks. i am an skilled C programmer yet i needed to change to GCC having deserted either Borland (my model used to be getting really outdated) & Microsoft (messy with a crippled deployment method) compilers on Win XP.

This small publication, and that's certainly one of its nice charms, is ideal. It relatively helped me make the transition and i've been very sucessfully development code on Ubuntu Linux and Win XP (MinGW) with GCC. as soon as up and working the extra refined beneficial properties are available on the net on the GNU web site (an instance for me was once tips to swap off definite warnings akin to -Wno-unused).

Though GCC is intrinsically tied to Linux the knowledge within the publication is instantly translatable to the MinGW-Win XP environment.

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The complete set of predefined macros can be listed by running the GNU preprocessor cpp with the option ‘-dM’ on an empty file: $ cpp -dM /dev/null #define __i386__ 1 #define __i386 1 #define i386 1 #define __unix 1 #define __unix__ 1 #define __ELF__ 1 #define unix 1 ....... Note that this list includes a small number of system-specific macros defined by gcc which do not use the double-underscore prefix. These nonstandard macros can be disabled with the ‘-ansi’ option of gcc. 2 Macros with values In addition to being defined, a macro can also be given a concrete value.

Using a debugger also allows the values of variables to be examined while the program is running. The debug option works by storing the names of functions and variables (and all the references to them), with their corresponding source code line-numbers, in a symbol table in object files and executables. 1 Examining core files In addition to allowing a program to be run under the debugger, another helpful application of the ‘-g’ option is to find the circumstances of a program crash. When a program exits abnormally the operating system can write out a core file, usually named ‘core’, which contains the in-memory state of the program at the time it crashed.

The ‘-Werror’ option changes the default behavior by converting warnings into errors, stopping the compilation whenever a warning occurs. (5) The traditional form of the C language was described in the original C reference manual “The C Programming Language (First Edition)” by Kernighan and Ritchie. 34 An Introduction to GCC Chapter 4: Using the preprocessor 35 4 Using the preprocessor This chapter describes the use of the GNU C preprocessor cpp, which is part of the GCC package. The preprocessor expands macros in source files before they are compiled.

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An Introduction to GCC by Brian J. Gough, Richard M. Stallman

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