OpenWrt编译并添加自己写的应用-基于MT7620a

1. 创建应用所需的目录
   在trunk/package/ramips/applications/创建helloworld目录
   （也可以在trunk/package/目录下创建helloworld目录）

2. 目录内的文件结构

   

3. 其中最外层Makefile的内容

############################################### OpenWrt Makefile for helloworld program### Most of the variables used here are defined in# the include directives below. We just need to# specify a basic description of the package,# where to build our program, where to find# the source files, and where to install the# compiled program on the router.## Be very careful of spacing in this file.# Indents should be tabs, not spaces, and# there should be no trailing whitespace in# lines that are not commented.###############################################include $(TOPDIR)/rules.mk# Name and release number of this packagePKG_NAME:=helloworldPKG_RELEASE:=1# This specifies the directory where we're going to build the program. # The root build directory, $(BUILD_DIR), is by default the build_mipsel# directory in your OpenWrt SDK directoryPKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)include $(INCLUDE_DIR)/package.mk# Specify package information for this program.# The variables defined here should be self explanatory.# If you are running Kamikaze, delete the DESCRIPTION# variable below and uncomment the Kamikaze define# directive for the description belowdefine Package/helloworld    SECTION:=utils    CATEGORY:=Utilities    TITLE:=Helloworld -- prints a snarky messageendef# Uncomment portion below for Kamikaze and delete DESCRIPTION variable abovedefine Package/helloworld/description    If you can't figure out what this program does, you're probably    brain-dead and need immediate medical attention.endef# Specify what needs to be done to prepare for building the package.# In our case, we need to copy the source files to the build directory.# This is NOT the default.  The default uses the PKG_SOURCE_URL and the# PKG_SOURCE which is not defined here to download the source from the web.# In order to just build a simple program that we have just written, it is# much easier to do it this way.define Build/Prepare    mkdir -p $(PKG_BUILD_DIR)    $(CP) ./src/* $(PKG_BUILD_DIR)/endefdefine Build/Configureendefdefine Build/Compile    $(MAKE) -C $(PKG_BUILD_DIR) \        CC="$(TARGET_CC)" \        CFLAGS="$(TARGET_CFLAGS) -Wall" \        LDFLAGS="$(TARGET_LDFLAGS)"endef# We do not need to define Build/Configure or Build/Compile directives# The defaults are appropriate for compiling a simple program such as this one# Specify where and how to install the program. Since we only have one file,# the helloworld executable, install it by copying it to the /bin directory on# the router. The $(1) variable represents the root directory on the router running# OpenWrt. The $(INSTALL_DIR) variable contains a command to prepare the install# directory if it does not already exist.  Likewise $(INSTALL_BIN) contains the# command to copy the binary file from its current location (in our case the build# directory) to the install directory.define Package/helloworld/install    $(INSTALL_DIR) $(1)/bin    $(INSTALL_BIN) $(PKG_BUILD_DIR)/helloworld $(1)/bin/endef# This line executes the necessary commands to compile our program.# The above define directives specify all the information needed, but this# line calls BuildPackage which in turn actually uses this information to# build a package.$(eval $(call BuildPackage,helloworld))

• 列表内容

src文件夹下的Makefile内容

helloworld: helloworld.o    $(CC) $(LDFLAGS) helloworld.o -o helloworldhelloworld.o: helloworld.c    $(CC) $(CFLAGS) -c helloworld.cclean:    rm *.o helloworld

• 应用程序helloworld的代码

/* ************************************************************************ *       Filename:  helloworld.c *    Description:   *        Version:  1.0 *        Created:  2016年01月22日 15时25分05秒 *       Revision:  none *       Compiler:  gcc *         Author:  YOUR NAME (),  *        Company:   * ************************************************************************/#include <stdio.h>int main(int argc, char *argv[]){    printf("Hello, world!\n");    return 0;}

• 编译make menuconfig
  选中Utilities -> helloworld
  

• 编译之后就可以在OpenWrt中运行helloworld命令了