Can I use Intel syntax of x86 assembly with GCC?

I want to write a small low level program. For some parts of it I will need to use assembly language, but the rest of the code will be written on C/C++.

So, if I will use GCC to mix C/C++ with assembly code, do I need to use AT&T syntax or can I use Intel syntax? Or how do you mix C/C++ and asm (intel syntax) in some other way?

I realize that maybe I don't have a choice and must use AT&T syntax, but I want to be sure..

And if there turns out to be no choice, where I can find full/official documentation about the AT&T syntax?

Thanks!