openWRT的ipk安装包编译方法

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openWRT的ipk编译方法



openwrt编译配置Build the OpenWrt SDK

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

编译应用


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
    #include<stdio.h>
    #include <unistd.h>
    int main(void)
    {
               printf("Hell! O' world, why won't my code compile?\n\n");
               return 0;
    }


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


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


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