如何在OpenWRT环境下做开发
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\u3000\u3000\uff082\uff09packages\u6587\u4ef6\u5939: \u91cc\u9762\u5305\u542b\u4e86\u6211\u4eec\u5728\u914d\u7f6e\u6587\u4ef6\u91cc\u8bbe\u5b9a\u7684\u6240\u6709\u7f16\u8bd1\u597d\u7684\u8f6f\u4ef6\u5305\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4f1a\u6709\u9ed8\u8ba4\u9009\u62e9\u7684\u8f6f\u4ef6\u5305\u3002
\u3000\u3000\uff083\uff09OpenWrt-SDK.**.tar.bz2: \u8fd9\u4e2a\u4e5f\u5c31\u662f\u6211\u4eec\u5b9a\u5236\u7f16\u8bd1\u597d\u7684OpenWRT SDK\u73af\u5883\u3002\u6211\u4eec\u5c06\u7528\u8fd9\u4e2a\u6765\u8fdb\u884cOpenWrt\u8f6f\u4ef6\u5305\u7684\u5f00\u53d1\u3002\u4f8b\u5982\uff0c\u6211\u6240\u7f16\u8bd1\u597d\u7684SDK\u73af\u5883\u5305\u4e3a\uff1a/bin/brcm47xx/OpenWrt-SDK-brcm47xx-for-Linux-x86_64-gcc-4.3.3+cs_uClibc-0.9.30.1.tar.bz2\u53ef\u4ee5\u4ece\u540d\u79f0\u4e0a\u770b\u51fa\uff0ctarget system\u662fbrcm47xx\uff0chost system\u662fLinux-x86_64\uff0c\u4f7f\u7528\u7684\u7f16\u8bd1\u5de5\u5177\u4ee5\u53ca\u5e93\u662f4.3.3+cs_uClibc-0.9.30.1\u3002
\u3000\u3000\uff084\uff09md5sums \u6587\u4ef6: \u8fd9\u4e2a\u6587\u4ef6\u8bb0\u5f55\u4e86\u6240\u6709\u6211\u4eec\u7f16\u8bd1\u597d\u7684\u6587\u4ef6\u7684MD5\u503c\uff0c\u6765\u4fdd\u8bc1\u6587\u4ef6\u7684\u5b8c\u6574\u6027\u3002\u56e0\u4e3a\u6587\u4ef6\u7684\u4e0d\u5b8c\u6574\uff0c\u5f88\u5bb9\u6613\u5c06\u8def\u7531\u5668\u53d8\u6210\u201c\u7816\u5934\u201d\u3002
\u3000\u3000\u9700\u8981\u4e3b\u8981\u7684\u662f\uff0c\u7f16\u8bd1\u5b8c\u6210\u540e\uff0c\u4e00\u5b9a\u8981\u5c06\u7f16\u8bd1\u597d\u7684bin\u76ee\u5f55\u8fdb\u884c\u5907\u4efd\uff08\u5982\u679c\u91cc\u9762\u4e1c\u897f\u5bf9\u4f60\u5f88\u91cd\u8981\u7684\u8bdd\uff09\uff0c\u56e0\u4e3a\u5728\u4e0b\u6b21\u7f16\u8bd1\u4e4b\u524d\uff0c\u6267\u884cmake clean \u4f1a\u5c06bin\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u6587\u4ef6\u7ed9\u6e05\u9664\u6389!!
\u3000\u30002\u3001 \u66f4\u6539\u539f\u6709packages
\u3000\u3000\u5728\u7f16\u8bd1\u6839\u76ee\u5f55\u4e0b\u4f1a\u6709\u4e00\u4e2adl\u7684\u76ee\u5f55\uff0c\u8fd9\u4e2a\u76ee\u5f55\u5176\u5b9e\u662f\u201cdownload\u201d\u7684\u7b80\u5199\uff0c\u5728\u7f16\u8bd1\u524d\u671f\uff0c\u9700\u8981\u4ece\u7f51\u7edc\u4e0b\u8f7d\u7684\u6570\u636e\u5305\u90fd\u4f1a\u653e\u5728\u8fd9\u4e2a\u76ee\u5f55\u4e0b\uff0c\u8fd9\u4e9b\u8f6f\u4ef6\u5305\u7684\u4e00\u4e2a\u7279\u70b9\u5c31\u662f\uff0c\u4f1a\u81ea\u52a8\u5b89\u88c5\u5728\u6240\u7f16\u8bd1\u7684\u56fa\u4ef6\u4e2d\uff0c\u4e5f\u5c31\u662f\u6211\u4eecmake menuconfig\u7684\u65f6\u5019\uff0c\u4e3a\u56fa\u4ef6\u914d\u7f6e\u7684\u4e00\u4e9b\u8f6f\u4ef6\u5305\u3002\u5982\u679c\u6211\u4eec\u9700\u8981\u66f4\u6539\u8fd9\u4e9b\u6e90\u7801\u5305\uff0c\u53ea\u9700\u8981\u5c06\u66f4\u6539\u597d\u7684\u6e90\u7801\u5305\u6253\u5305\u6210\u76f8\u540c\u7684\u540d\u5b57\u653e\u5728\u8fd9\u4e2a\u76ee\u5f55\u4e0b\uff0c\u7136\u540e\u5f00\u59cb\u7f16\u8bd1\u5373\u53ef\u3002\u7f16\u8bd1\u65f6\uff0c\u4f1a\u5c06\u8f6f\u4ef6\u5305\u89e3\u538b\u5230build_dir\u76ee\u5f55\u4e0b\u3002\u5f53\u7136\uff0c\u4f60\u4e5f\u53ef\u4ee5\u81ea\u5df1\u5728dl\u91cc\u9762\u521b\u5efa\u81ea\u5df1\u7684\u8f6f\u4ef6\u5305\uff0c\u7136\u540e\u66f4\u6539\u76f8\u5173\u7684\u914d\u7f6e\u6587\u4ef6\uff0c\u8ba9openwrt\u53ef\u4ee5\u8bc6\u522b\u8fd9\u4e2a\u6587\u4ef6\u5305\u3002
\u3000\u3000\u7531\u4e8e\u6211\u7684\u9879\u76ee\u66f4\u6539\u7684\u5185\u5bb9\u662f\u5e95\u5c42\u7684\uff0c\u9700\u8981\u8ddf\u56fa\u4ef6\u4e00\u8d77\u5b89\u88c5\u3002\u6240\u4ee5\uff0c\u6211\u4f7f\u7528\u7684\u65b9\u6cd5\u5c31\u662f\u76f4\u63a5\u66f4\u6539dl\u76ee\u5f55\u4e0b\u8f6f\u4ef6\u5305\uff0c\u7136\u540e\u91cd\u65b0\u8fdb\u884c\u56fa\u4ef6\u7f16\u8bd1\u3002\u611f\u89c9\u7c7b\u4f3c\u4e8eLinux\u7684\u5185\u6838\u7f16\u8bd1\u3002\u53cd\u590d\u7f16\u8fc7\u5341\u591a\u6b21\uff0c\u6ca1\u6709\u4efb\u4f55\u95ee\u9898\u3002
\u3000\u30003\u3001 \u65b0\u5efa\u81ea\u5df1\u7684packages\u5bf9\u4e8e\u81ea\u5df1\u65b0\u5efa\u7684package\uff0c\u800c\u8fd9\u4e2apackage\u53c8\u4e0d\u9700\u8981\u968f\u56fa\u4ef6\u4e00\u8d77\u5b89\u88c5\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0c\u5c31\u662f\u53ef\u4ee5\u5f53\u505a\u4e00\u4e2a\u53ef\u9009\u8f6f\u4ef6\u5305\u7684\u8bdd\u3002\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u6211\u4eec\u7684SDK\u73af\u5883\u6765\u5355\u72ec\u7f16\u8bd1\uff0c\u7f16\u8bd1\u540e\u4f1a\u751f\u6210\u4e00\u4e2aipk\u7684\u6587\u4ef6\u5305\u3002\u7136\u540e\u5229\u7528 opkg install xxx.ipk \u6765\u5b89\u88c5\u8fd9\u4e2a\u8f6f\u4ef6\u3002
\u3000\u3000\u4e0b\u9762\u5177\u4f53\u8bf4\u4e0b\uff0c\u5982\u4f55\u7f16\u8bd1\u4e00\u4e2ahelloword\u7684\u8f6f\u4ef6\u5305\u3002\uff081\uff09\u9996\u5148\uff0c\u7f16\u5199helloworld\u7a0b\u5e8f \u7f16\u5199helloworld.c /**************** * Helloworld.c * The most simplistic C program ever written. * An epileptic monkey on crack could write this code. *****************/
\u3000\u3000#include #include int main(void) { printf("Hell! O' world, why won't my code compile?\n\n"); return 0; }
\u3000\u3000\u7f16\u5199Makefile\u6587\u4ef6# build helloworld executable when user executes "make"
\u3000\u3000helloworld: helloworld.o$(CC) $(LDFLAGS) helloworld.o -o helloworld
\u3000\u3000helloworld.o: helloworld.c$(CC) $(CFLAGS) -c helloworld.c
\u3000\u3000# remove object files and executable when user executes "make clean"clean: rm *.o helloworld \u5728\u8fd9\u4e24\u4e2a\u6587\u4ef6\u7684\u76ee\u5f55\u4e0b\uff0c\u6267\u884cmake \u5e94\u8be5\u53ef\u4ee5\u751f\u6210helloworld\u7684\u53ef\u6267\u884c\u6587\u4ef6\u3002\u6267\u884chelloworld\u540e\uff0c\u80fd\u591f\u6253\u5370\u51fa\u201cHell! O' world, why won't my code compile?\u201d\u3002 \u8fd9\u4e00\u6b65\uff0c\u4e3b\u8981\u4fdd\u8bc1\u6211\u4eec\u7684\u6e90\u7a0b\u5e8f\u662f\u53ef\u4ee5\u6b63\u5e38\u7f16\u8bd1\u7684\u3002\u4e0b\u9762\u6211\u4eec\u5c06\u5176\u79fb\u690d\u5230OpenWRT\u4e0a\u3002
\u3000\u3000\uff082\uff09\u5c06OpenWrt-SDK-brcm47xx-for-Linux-x86_64-gcc-4.3.3+cs_uClibc-0.9.30.1.tar.bz2\u89e3\u538btar \u2013xvf OpenWrt-SDK-brcm47xx-for-Linux-x86_64-gcc-4.3.3+cs_uClibc-0.9.30.1.tar.bz2
\u3000\u3000\uff083\uff09\u8fdb\u5165SDKcd OpenWrt-SDK-brcm47xx-for-Linux-x86_64-gcc-4.3.3+cs_uClibc-0.9.30.1 \u53ef\u4ee5\u770b\u5230\u91cc\u9762\u7684\u76ee\u5f55\u7ed3\u6784\u8ddf\u6211\u4eec\u4e4b\u524dsource\u7684\u76ee\u5f55\u7ed3\u6784\u57fa\u672c\u76f8\u540c\uff0c\u6240\u9700\u8981\u7f16\u8bd1\u7684\u8f6f\u4ef6\u5305\uff0c\u9700\u8981\u653e\u7f6e\u5728package\u76ee\u5f55\u4e0b
\u3000\u3000\uff084\uff09\u5728package\u76ee\u5f55\u4e0b\u521b\u5efahelloworld\u76ee\u5f55cd package mkdir helloworld cd helloworld
\u3000\u3000\uff085\uff09\u521b\u5efasrc\u76ee\u5f55\uff0c\u62f7\u8d1d helloworld\u6587\u4ef6mkdir src cp /home/wrt/test/helloworld.c src cp /home/wrt/test/Makefile src
\u3000\u3000\uff086\uff09\u5728helloworld\u76ee\u5f55\u4e0b\u521b\u5efaMakefile\u6587\u4ef6\u8fd9\u4e2aMakefile\u6587\u4ef6\u662f\u7ed9OpenWRT\u8bfb\u7684\uff0c\u800c\u4e4b\u524d\u5199\u7684\u90a3\u4e2aMakefile\u6587\u4ef6\u662f\u9488\u5bf9helloworld\u7ed9\u7f16\u8bd1\u5176\u8bfb\u7684\u3002\u4e24\u4e2aMakefile\u4e0d\u5728\u540c\u4e00\u5c42\u76ee\u5f55\u4e0b\u3002
\u3000\u3000touch Makefilevim Makefile
\u3000\u3000Makefile\u6587\u4ef6\u6a21\u677f\u5185\u5bb9\u5982\u4e0b\uff1a############################################## # 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. # ##############################################
\u3000\u3000include $(TOPDIR)/rules.mk
\u3000\u3000# Name and release number of this packagePKG_NAME:=helloworld PKG_RELEASE:=1
\u3000\u3000# 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 directory PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
\u3000\u3000include $(INCLUDE_DIR)/package.mk
\u3000\u3000# 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 below define Package/helloworld SECTION:=utils CATEGORY:=Utilities TITLE:=Helloworld -- prints a snarky message endef
\u3000\u3000# 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
\u3000\u3000# 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)/ endef
\u3000\u3000# 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
\u3000\u3000# 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
\u3000\u3000# 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))
\u3000\u3000\uff087\uff09\u8fd4\u56de\u5230SDK\u7684\u6839\u76ee\u5f55\u6267\u884cmake\u8fdb\u884c\u7f16\u8bd1 \u7f16\u8bd1\u8fc7\u7a0b\u4f1a\u5728build_dir\u76ee\u5f55\u4e0b\u5b8c\u6210 \u7f16\u8bd1\u7ed3\u679c\u4f1a\u653e\u5728 bin/[yourtarget]/package\u76ee\u5f55\u4e0bhelloworld_1_bcm47xx.ipk
\u3000\u3000\uff088\uff09\u4e0a\u4f20helloworld_1_bcm47xx.ipk\u4f7f\u7528sftp\u8f6f\u4ef6\u4e0a\u4f20helloworld_1_bcm47xx.ipk\u81f3\u8def\u7531\u5668 \u6267\u884c opkg install helloworld_1_bcm47xx.ipk \u8f93\u5165hello\u7136\u540e\u6309Tab\u952e\uff0c\u53d1\u73b0openwrt\u4e2d\u5df2\u7ecf\u6709helloworld\u53ef\u6267\u884c\u547d\u4ee4\u3002 \u6267\u884c helloworld \u67e5\u770b\u7a0b\u5e8f\u7684\u6548\u679c\u3002
\u3000\u3000Hell! O' world, why won't my code compile?
\u3000\u3000\u3010End\u3011
\u3000\u3000\u5e0c\u671b\u5bf9\u5927\u5bb6\u80fd\u6709\u5e2e\u52a9 :)
\u3000\u3000\u8f6c\u8f7d
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1、搭建开发环境首先，在执行make menuconfig后，
大家可以根据不同的路由器进行不同的选择；绿框部分表示我们需要编译一个SDK开发环境（默认情况下，此项未勾选）。
编译过程中需要通过官网下载很多相关的软件包，所以必须保证能够顺利连上外网。由于下载速度的限制，编译过程大概需要数小时。编译结束后，所有的产品都会放在编译根目录下的bin/yourtarget/. 例如:我所编译的产物都放在./bin/brcm47xx/下，其中文件主要有几类：
（1）.bin/.trx 文件: 这些都是在我们所选的target-system的类别之下，针对不同路由器型号、版本编译的路由器固件。这些不同路由器的型号和版本是openwrt预先设置好的，我们不需要更改。至于.bin和.trx的区别，一种说法是，第一次刷路由器的时候，需要用.bin文件，如果需要再升级，则不能再使用.bin文件，而需要用.trx文件。原因是，.bin是将路由器的相关配置信息和.trx封装在一起而生成的封包，也就是说是包含路由器版本信息的.trx。在第一次刷固件的时候，我们需要提供这样的信息，而在后续升级时，则不再需要，用.trx文件即可。
（2）packages文件夹: 里面包含了我们在配置文件里设定的所有编译好的软件包。默认情况下，会有默认选择的软件包。
（3）OpenWrt-SDK.**.tar.bz2: 这个也就是我们定制编译好的OpenWRT SDK环境。我们将用这个来进行OpenWrt软件包的开发。例如，我所编译好的SDK环境包为：/bin/brcm47xx/OpenWrt-SDK-brcm47xx-for-Linux-x86_64-gcc-4.3.3+cs_uClibc-0.9.30.1.tar.bz2
可以从名称上看出，target system是brcm47xx，host system是Linux-x86_64，使用的编译工具以及库是4.3.3+cs_uClibc-0.9.30.1。
（4）md5sums 文件: 这个文件记录了所有我们编译好的文件的MD5值，来保证文件的完整性。因为文件的不完整，很容易将路由器变成“砖头”。
需要主要的是，编译完成后，一定要将编译好的bin目录进行备份（如果里面东西对你很重要的话），因为在下次编译之前，执行make clean 会将bin目录下的所有文件给清除掉!!
2、 更改原有packages
在编译根目录下会有一个dl的目录，这个目录其实是“download”的简写，在编译前期，需要从网络下载的数据包都会放在这个目录下，这些软件包的一个特点就是，会自动安装在所编译的固件中，也就是我们make menuconfig的时候，为固件配置的一些软件包。如果我们需要更改这些源码包，只需要将更改好的源码包打包成相同的名字放在这个目录下，然后开始编译即可。编译时，会将软件包解压到build_dir目录下。
当然，你也可以自己在dl里面创建自己的软件包，然后更改相关的配置文件，让openwrt可以识别这个文件包。
由于我的项目更改的内容是底层的，需要跟固件一起安装。所以，我使用的方法就是直接更改dl目录下软件包，然后重新进行固件编译。感觉类似于Linux的内核编译。反复编过十多次，没有任何问题。
3、 新建自己的packages
对于自己新建的package，而这个package又不需要随固件一起安装，换句话说，就是可以当做一个可选软件包的话。我们可以利用我们的SDK环境来单独编译，编译后会生成一个ipk的文件包。然后利用 opkg install xxx.ipk 来安装这个软件。
下面具体说下，如何编译一个helloword的软件包。
（1）首先，编写helloworld程序
编写helloworld.c
/****************
* Helloworld.c
* The most simplistic C program ever written.
* An epileptic monkey on crack could write this code.
*****************/
#include <stdio.h>
#include <unistd.h>
int main(void)
{
printf("Hell! O' world, why won't my code compile?\n\n");
return 0;
}
编写Makefile文件
# build helloworld executable when user executes "make"
helloworld: helloworld.o
$(CC) $(LDFLAGS) helloworld.o -o helloworld
helloworld.o: helloworld.c
$(CC) $(CFLAGS) -c helloworld.c
# remove object files and executable when user executes "make clean"
clean:
rm *.o helloworld
在这两个文件的目录下，执行make 应该可以生成helloworld的可执行文件。执行helloworld后，能够打印出“Hell! O' world, why won't my code compile?”。 这一步，主要保证我们的源程序是可以正常编译的。下面我们将其移植到OpenWRT上。
（2）将OpenWrt-SDK-brcm47xx-for-Linux-x86_64-gcc-4.3.3+cs_uClibc-0.9.30.1.tar.bz2解压
tar –xvf OpenWrt-SDK-brcm47xx-for-Linux-x86_64-gcc-4.3.3+cs_uClibc-0.9.30.1.tar.bz2
（3）进入SDK
cd OpenWrt-SDK-brcm47xx-for-Linux-x86_64-gcc-4.3.3+cs_uClibc-0.9.30.1
可以看到里面的目录结构跟我们之前source的目录结构基本相同，所需要编译的软件包，需要放置在package目录下
（4）在package目录下创建helloworld目录
cd package
mkdir helloworld
cd helloworld
（5）创建src目录，拷贝 helloworld文件
mkdir src
cp /home/wrt/test/helloworld.c src
cp /home/wrt/test/Makefile src
（6）在helloworld目录下创建Makefile文件
这个Makefile文件是给OpenWRT读的，而之前写的那个Makefile文件是针对helloworld给编译其读的。两个Makefile不在同一层目录下。
touch Makefile
vim Makefile
Makefile文件模板内容如下：
##############################################
# 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 package
PKG_NAME:=helloworld
PKG_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 directory
PKG_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 below
define Package/helloworld
SECTION:=utils
CATEGORY:=Utilities
TITLE:=Helloworld -- prints a snarky message
endef
# Uncomment portion below for Kamikaze and delete DESCRIPTION variable above
define 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)/
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))
（7）返回到SDK的根目录
执行make进行编译
编译过程会在build_dir目录下完成
编译结果会放在 bin/[yourtarget]/package目录下helloworld_1_bcm47xx.ipk
（8）上传helloworld_1_bcm47xx.ipk
使用sftp软件上传helloworld_1_bcm47xx.ipk至路由器
执行 opkg install helloworld_1_bcm47xx.ipk
输入hello然后按Tab键，发现openwrt中已经有helloworld可执行命令。
执行 helloworld 查看程序的效果。
Hell! O' world, why won't my code compile?
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