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

By Brian J. Gough, Richard M. Stallman

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an skilled C programmer yet i wished to change to GCC having deserted either Borland (my model was once getting really outdated) & Microsoft (messy with a crippled deployment approach) compilers on Win XP.

This small e-book, and that's one among its nice charms, is ideal. It particularly 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 working the extra refined good points are available on the internet on the GNU web site (an instance for me used to be how you can change off convinced warnings resembling -Wno-unused).

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

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Extra info for An Introduction to GCC

Sample text

1) Common subexpression elimination is powerful, because it simultaneously increases the speed and reduces the size of the code. 2 Function inlining Another type of source-level optimization, called function inlining, increases the efficiency of frequently-called functions. Whenever a function is used, a certain amount of extra time is required for the CPU to carry out the call: it must store the function arguments in the appropriate registers and memory locations, jump to the start of the function (bringing the appropriate virtual memory pages into physical memory or the CPU cache if necessary), begin executing the code, and then return to the original point of execution when the function call is complete.

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. When a macro is defined with ‘-D’ alone, gcc uses a default value of 1. 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.

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.

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