openWRT的ipk编译方法

编译时要配置内核，make menuconfig

配置Build the OpenWrt SDK ，前提条件是openwrt编译成功

1.在编译好的文件中会有/bin/ramips/OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.6-linaro_uClibc-0.9.33.2.tar.bz2文件
2.然后解压这个文件

tar xvf OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.6-linaro_uClibc-0.9.33.2.tar.bz2

进入这个sdk，会看见一个package，在下新建mkdir -p helloworld/src 两个目录

在目录src下新建helloworld.c

1.     #include  
   
2.     #include   
   
3.     int main(void)  
   
4.     {  
   
5.                printf("Hell! O' world, why won't my code compile?\n\n");  
   
6.                return 0;  
   
7.     }  

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然后在此目录下创建Makefile( 注意Makefile的语法要用tab )

1.     # build helloworld executable when user executes "make"  
   
2.     helloworld: helloworld.o  
   
3.          $(CC) $(LDFLAGS) helloworld.o -o helloworld  
   
4. helloworld.o: helloworld.c  
   
5.                     $(CC) $(CFLAGS) -c helloworld.c  
   
6.     # remove object files and executable when user executes "make clean"  
   
7.     clean:  
   
8.                    rm *.o helloworld  

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然后返回上层目录，即helloworld目录，在此目录下创建一个Makefile

1.     ##############################################  
   
2.     # OpenWrt Makefile for helloworld program  
   
3.     #  
   
4.     #  
   
5.     # Most of the variables used here are defined in  
   
6.     # the include directives below. We just need to  
   
7.     # specify a basic description of the package,  
   
8.     # where to build our program, where to find  
   
9.     # the source files, and where to install the  
   
10.     # compiled program on the router.  
    
11.     #  
    
12.     # Be very careful of spacing in this file.  
    
13.     # Indents should be tabs, not spaces, and  
    
14.     # there should be no trailing whitespace in  
    
15.     # lines that are not commented.  
    
16.     #  
    
17.     ##############################################  
    
18.     include $(TOPDIR)/rules.mk  
    
19.     # Name and release number of this package  
    
20.     PKG_NAME:=helloworld  
    
21.     PKG_RELEASE:=1  
    
22.       
    
23.       
    
24.     # This specifies the directory where we're going to build the program.   
    
25.     # The root build directory, $(BUILD_DIR), is by default the build_mipsel  
    
26.     # directory in your OpenWrt SDK directory  
    
27.     PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)  
    
28.       
    
29.       
    
30.     include $(INCLUDE_DIR)/package.mk  
    
31.        
    
32.     # Specify package information for this program.  
    
33.     # The variables defined here should be self explanatory.  
    
34.     # If you are running Kamikaze, delete the DESCRIPTION  
    
35.     # variable below and uncomment the Kamikaze define  
    
36.     # directive for the description below  
    
37.     define Package/helloworld  
    
38.                    SECTION:=utils  
    
39.                    CATEGORY:=Utilities  
    
40.                    TITLE:=Helloworld -- prints a snarky message  
    
41.     endef  
    
42.     # Uncomment portion below for Kamikaze and delete DESCRIPTION variable above  
    
43.     define Package/helloworld/description  
    
44.             If you can't figure out what this program does, you're probably  
    
45.             brain-dead and need immediate medical attention.  
    
46.     endef  
    
47.     # Specify what needs to be done to prepare for building the package.  
    
48.     # In our case, we need to copy the source files to the build directory.  
    
49.     # This is NOT the default.  The default uses the PKG_SOURCE_URL and the  
    
50.     # PKG_SOURCE which is not defined here to download the source from the web.  
    
51.     # In order to just build a simple program that we have just written, it is  
    
52.     # much easier to do it this way.  
    
53.     define Build/Prepare  
    
54.                    mkdir -p $(PKG_BUILD_DIR)  
    
55.                    $(CP) ./src/* $(PKG_BUILD_DIR)/  
    
56.     endef  
    
57.     # We do not need to define Build/Configure or Build/Compile directives  
    
58.     # The defaults are appropriate for compiling a simple program such as this one  
    
59.     # Specify where and how to install the program. Since we only have one file,  
    
60.     # the helloworld executable, install it by copying it to the /bin directory on  
    
61.     # the router. The $(1) variable represents the root directory on the router running  
    
62.     # OpenWrt. The $(INSTALL_DIR) variable contains a command to prepare the install  
    
63.     # directory if it does not already exist.  Likewise $(INSTALL_BIN) contains the  
    
64.     # command to copy the binary file from its current location (in our case the build  
    
65.     # directory) to the install directory.  
    
66.     define Package/helloworld/install  
    
67.                     $(INSTALL_DIR) $(1)/bin  
    
68.                     $(INSTALL_BIN) $(PKG_BUILD_DIR)/helloworld $(1)/bin/  
    
69.     endef  
    
70.     # This line executes the necessary commands to compile our program.  
    
71.     # The above define directives specify all the information needed, but this  
    
72.     # line calls BuildPackage which in turn actually uses this information to  
    
73.     # build a package.  
    
74.     $(eval $(call BuildPackage,helloworld))

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这里的Makefile文件要注意tab（如果是复制过去的话）

然后回到OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.6-linaro_uClibc-0.9.33.2目录执行make

编译过程会在build_dir目录下完成
make[1] world
make[2] package/compile
make[3] -C package/helloworld compile
make[2] package/index

说明编译成功

编译好的文件放置在 bin/[yourtarget]/package目录下