help writing gcc code

[AaronCloyd]

I need to edit a gcc source code, then recompile.  My goal is to change what
gets output in the assembly file, when using the '-S' flag.  
I figured a good first step would be, being able to print out "Hello World!"
somewhere in the '.s' file. I'm having trouble finding which source code
file I need to edit though.
Any help would be great. Thanks.
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