Download An introduction to GCC : for the GNU compilers gcc and g++ by Brian J. Gough, Richard M. Stallman PDF

By Brian J. Gough, Richard M. Stallman

This handbook presents an entire educational creation to the GNU C and C++ compilers, gcc and g++. Many books train the C and C++ languages, this e-book teaches you the way to take advantage of the compiler itself. all of the universal difficulties and blunder messages encountered by way of new clients of GCC are rigorously defined, with a variety of easy-to-follow "Hello global" examples. issues coated comprise: compiling C and C++ courses utilizing header documents and libraries, caution innovations, use of the preprocessor, static and dynamic linking, debugging, optimization, platform-specific innovations, profiling and assurance trying out, paths and atmosphere variables, and the C++ general library and templates. includes a specific foreword by way of Richard M. Stallman, important developer of GCC and founding father of the GNU undertaking. all of the funds raised from the sale of this e-book will aid the improvement of loose software program and documentation

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Additional info for An introduction to GCC : for the GNU compilers gcc and g++

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Out Value of NUM is 100 This example uses a number, but a macro can take values of any form. Whatever the value of the macro is, it is inserted directly into the source code at the point where the macro name occurs. h> int main (void) { printf("Value of NUM is %d\n", 2+2); return 0; } Note that it is a good idea to surround macros by parentheses whenever they are part of an expression. out Ten times NUM is 40 38 An Introduction to GCC Without parentheses, the program would produce the value 22 from the literal form of the expression 10*2+2 = 22, instead of the desired value 10*(2+2) = 40.

Macros are generally undefined, unless specified on the command line with the option ‘-D’, or in a source file (or library header file) with #define. Some macros are automatically defined by the compiler—these typically use a reserved namespace beginning with a double-underscore prefix ‘__’. 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 .......

A point that sometimes causes confusion is that gcc will actually compile C++ source code when it detects a C++ file extension, but cannot then link the resulting object files. text+0x1b): undefined reference to ‘std::cout’ In order to avoid this problem it is best to use g++ consistently for C++ programs, and gcc for C programs. 2 Using the C++ standard library An implementation of the C++ standard library is provided as a part of GCC. out Hello, World! Note that in accordance with the C++ standard, the header files for the C++ library itself do not use a file extension.

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