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Hi, is possible force the inline functions when I compile a source with gcc?

Ps. Sorry for my bad English.... I'm not English

Maybe -finline-functions ?

erm sorry for the possible noob question , but can't you just declare them "inline" and that's it?

So the compiler decides if he want expand them or use them as functions.... I want force the expanding

You can force it with a gcc attribute:
static void inline __attribute__((always_inline)) yourFunction() ...

I must declare it as static?

Well, no, static just tells the compiler/linker that that function can only be used in the file that it is defined and written in.

Its a good idea to prevent clashes if you're puting the function inside of a header file. Otherwise each object file could export this function, leading to multiple definition errors when you link.

In some cases, forcing the inlining isn't a good idea, so make sure you are aware of the implications, e.g. when using virtual functions. (Read Scott Meyers' "Effective C++"?)

In some cases, forcing the inlining isn't a good idea, so make sure you are aware of the implications, e.g. when using virtual functions.

Yes but if I had to write a for cycle, I'd prefare write it as inline function that a real function (isn't faster???)

Simply declare the function 'inline' (and define it in the header file) and let the compiler decide whether to actually inline it or not. That's why 'inline' is merely a suggestion: The compiler knows more about the generated code than you do. (Usually.)

"Forcing" something is almost never a good idea.