How can I use gcc's -I command to add recursive folders

Is there a way to use gcc's -I command and add all the paths to search path by giving a root directory?

I'm trying to use :!gcc -E myfile.c to view macro expansions, but myfile.c includes a whole bunch of other header files in different directories, and because I'm executing this command in vim, so I don't want to call a makefile, is there anyway to do this?