OpenWRT Makefile流程记录

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$(toolchain/stamp-install): $(tools/stamp-install)   通过subdir.mk的stampfile函数 $(eval $(call stampfile,$(curdir),tools,install,,_$(subst $(space),,$(tools_enabled)))) 展开 define stampfile   $(1)/stamp-$(3):=$(if $(6),$(6),$(STAGING_DIR))/stamp/.$(2)_$(3)$(5)   $$($(1)/stamp-$(3)): $(TMP_DIR)/.build $(4)     @+$(SCRIPT_DIR)/timestamp.pl -n $$($(1)/stamp-$(3)) $(1) $(4) || \         $(MAKE) $(if $(QUIET),--no-print-directory) $$($(1)/flags-$(3)) $(1)/$(3)     @mkdir -p $$$$(dirname $$($(1)/stamp-$(3)))     @touch $$($(1)/stamp-$(3))     $$(if $(call debug,$(1),v),,.SILENT: $$($(1)/stamp-$(3)))     .PRECIOUS: $$($(1)/stamp-$(3)) # work around a make bug     $(1)//clean:=$(1)/stamp-$(3)/clean   $(1)/stamp-$(3)/clean: FORCE     @rm -f $$($(1)/stamp-$(3)) endef   tools/stamp-install:= $(STAGING_DIR)/stamp/.tools_install_yyynnnyynnn $(tools/stamp-install): tmp/.build     make $(tools/flags-install) tools/install #通过subdir.mk的subdir函数展开产生规则     tools/clean:=tools/stamp-install/clean     tools/stamp-install/clean: FORCE         rm -rf $(tools/stamp-install)   subdir展开关于clean有一个，如果clean则同时要执行tools/stamp-install/clean删除文件，其他命令不影响 tools/clean:  tools/stamp-install/clean     @+ $(SUBMAKE) -r -C target/linux clean BUILD_VARIANT=""