By Brian J. Gough, Richard M. Stallman

I have been examining and utilizing this little publication for the previous few weeks. i am an skilled C programmer yet i needed to change to GCC having deserted either Borland (my model was once getting particularly outdated) & Microsoft (messy with a crippled deployment process) compilers on Win XP.

This small e-book, and that's considered one of its nice charms, is ideal. It fairly helped me make the transition and i've been very sucessfully construction code on Ubuntu Linux and Win XP (MinGW) with GCC. as soon as up and operating the extra sophisticated positive aspects are available on the internet on the GNU web site (an instance for me used to be find out how to swap off yes warnings comparable to -Wno-unused).

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

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Out Value of NUM is 1 A macro can be defined to a empty value using quotes on the command line, -DNAME ="". Such a macro is still treated as defined by conditionals such as #ifdef, but expands to nothing. A macro containing quotes can be defined using shell-escaped quote characters. ". For an explanation of the different types of quoting and escaping used in the shell see the “GNU Bash Reference Manual”, [Further reading], page 91. 3 Preprocessing source files It is possible to see the effect of the preprocessor on source files directly, using the ‘-E’ option of gcc.

Done. done. c:13 13 int y = *p; (gdb) The final line (gdb) is the GNU Debugger prompt—it indicates that further commands can be entered at this point. To investigate the cause of the crash, we display the value of the pointer p using the debugger print command: (gdb) print p $1 = (int *) 0x0 This shows that p is a null pointer (0x0) of type ‘int *’, so we know that dereferencing it with the expression *p in this line has caused the crash. (3) This example uses the ulimit command in the GNU Bash shell.

Cc -o hello The C++ frontend of GCC uses many of the same the same options as the C compiler gcc. It also supports some additional options for controlling C++ language features, which will be described in this chapter. c’ extension used for C programs. /hello Hello, world! The executable produces the same output as the C version of the program, using std::cout instead of the C printf function. All the options used in 56 An Introduction to GCC the gcc commands in previous chapters apply to g++ without change, as do the procedures for compiling and linking files and libraries (using g++ instead of gcc, of course).

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