# Compile a unit file and return the compiler return code
	#
	# Can terminate the program if the compiler is not found
	private fun compile_single_docunits(dus: Array[DocUnit]): Int
	do
		# Generate all unitfiles
		var files = new Array[String]
		for du in dus do
			files.add generate_single_docunit(du)
		end

		if files.is_empty then return 0

		toolcontext.info("Compile {dus.length} single(s) doc-unit(s) at once", 1)

		# Mass compile them
		var nitc = toolcontext.find_nitc
		var opts = new Array[String]
		if mmodule != null then
			# FIXME playing this way with the include dir is not safe nor robust
			opts.add "-I {mmodule.filepath.dirname}"
		end
		var cmd = "{nitc} --ignore-visibility --no-color -q '{files.join("' '")}' {opts.join(" ")} > '{prefix}.out1' 2>&1 </dev/null --dir {prefix.dirname}"
		var res = toolcontext.safe_exec(cmd)
		if res != 0 then
			# Mass compilation failure
			return res
		end

		# Rename each file into it expected binary name
		for du in dus do
			var f = du.test_file.as(not null)
			toolcontext.safe_exec("mv '{f.strip_extension(".nit")}' '{f}.bin'")
			du.is_compiled = true
		end

		return res
	end