Read e-book online An introduction to GCC : for the GNU compilers gcc and g++ PDF
By Brian J. Gough, Richard M. Stallman
This handbook presents an entire instructional creation to the GNU C and C++ compilers, gcc and g++. Many books educate the C and C++ languages, this booklet teaches you the way to take advantage of the compiler itself. the entire universal difficulties and blunder messages encountered by means of new clients of GCC are conscientiously defined, with a variety of easy-to-follow "Hello international" examples. issues coated comprise: compiling C and C++ courses utilizing header records and libraries, caution thoughts, use of the preprocessor, static and dynamic linking, debugging, optimization, platform-specific concepts, profiling and assurance checking out, paths and surroundings variables, and the C++ average library and templates. includes a designated foreword by means of Richard M. Stallman, valuable developer of GCC and founding father of the GNU undertaking. the entire cash raised from the sale of this booklet will help the advance of unfastened software program and documentation
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Extra resources for An introduction to GCC : for the GNU compilers gcc and g++
This amendment was mainly concerned with internationalization, such as adding support for multibyte characters to the C library. ‘-std=c99’ or ‘-std=iso9899:1999’ The revised ISO C language standard, published in 1999 (ISO/IEC 9899:1999). The C language standards with GNU extensions can be selected with the options ‘-std=gnu89’ and ‘-std=gnu99’. 1 [Compiling a simple C program], page 7), the warning option ‘-Wall’ enables warnings for many common errors, and should always be used. It combines a large number of other, more specific, warning options which can also be selected individually.
This option is generally the best choice for deployment of a program, because it provides maximum optimization without increasing the executable size. It is the default optimization level for releases of GNU packages. ‘-O3’ This option turns on more expensive optimizations, such as function inlining, in addition to all the optimizations of the lower levels ‘-O2’ and ‘-O1’. The ‘-O3’ optimization level may increase the speed of the resulting executable, but can also increase its size. Under some circumstances where these optimizations are not favorable, this option might actually make a program slower.
It combines a large number of other, more specific, warning options which can also be selected individually. Here is a summary of these options: ‘-Wcomment’ (included in ‘-Wall’) This option warns about nested comments. 23 ; /* x-position */ */ Nested comments can be a source of confusion—the safe way to “comment out” a section of code containing comments is to surround it with the preprocessor directive #if 0 ... 23 ; /* x-position */ #endif 30 An Introduction to GCC ‘-Wformat’ (included in ‘-Wall’) This option warns about the incorrect use of format strings in functions such as printf and scanf, where the format specifier does not agree with the type of the corresponding function argument.
An introduction to GCC : for the GNU compilers gcc and g++ by Brian J. Gough, Richard M. Stallman