openwrt中在软件包中定义PKG_INSTALL将会发生什么?

答: 将会使用默认软件包安装方式,相关代码如下

1. 在include/package.mk中:
    Build/Install=$(if $(PKG_INSTALL),$(call Build/Install/Default,))

2. 在include/package-defaults.mk中:
    define Build/Install/Default
        $(MAKE_VARS) 
            $(MAKE) -C $(PKG_BUILD_DIR)/$(MAKE_PATH) 
            $(MAKE_INSTALL_FLAGS) 
            $(if $(1), $(1), install);
    endef