user_apps_sub_dirs=shell about test_kvm ECHO: @echo "$@" $(user_apps_sub_dirs): ECHO $(MAKE) -C $@ all CFLAGS="$(CFLAGS)" tmp_output_dir="$(tmp_output_dir)" output_dir="$(output_dir)" sys_libs_dir="$(sys_libs_dir)" all: $(user_apps_sub_dirs) .PHONY: clean fmt: @echo "格式化代码: user/apps"