OSDev.org

Ok,I'm preparing for this weekend to create a simple OS.I have only one doubt:
How can I create executables for my OS?

You compile them as normal using gcc or any other tool of you choice.

If you are using an already defined executable format such as PE or ELF:
Build a cross-compiler which supports generating code for your target processor and executable format.

If you are rolling your own executable format:
Modify a compiler to add support for your format. This can be very difficult.

I'd read OS_Specific_Toolchain on the wiki, it answers your question pretty much perfectly.

Thank very much guys!!!!