// But there might be an x.go in the original dir too, and if it
	// uses cgo as well, cgo will be processing both and will
	// translate both into x.cgo1.go in the objdir, overwriting one.
	// Rename x.go to _x_swig.go to avoid this problem.
	// We ignore files in the original dir that begin with underscore
	// so _x_swig.go cannot conflict with an original file we were
	// going to compile.
	goFile = objdir + goFile