Openwrt之helloworld
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一、制作helloworld软件包 在制作好的SDK环境OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2.tar.bz2下创建helloworld包package/$mkdir helloworldpackage/helloworld/$创建Makefile 和 src目录Makefile src/src目录下编辑helloworld.c Makefilehelloworld.c如下:- #include <stdio.h>
-
- int main(void)
- {
- printf("hello,OpenWrt!\n");
-
- return 0;
- }
Makefile如下:- helloworld:helloworld.o
- $(CC) $(LDFLAGS) helloworld.o -o helloworld
- hello.o:hello.c
- $(CC) $(CFLAGS) -c helloworld.c
-
- clean:
- rm *.o helloworld
在linux环境进入src目录直接make 就可以生成helloworld helloworld.o了。注:交叉工具链在SDK staging_dir/toolchain-mipsel_24kec+dsp_gcc-4.8-linaro_uClibc-0.9.33.2/bin/
移植到openwrt环境,关键是package/helloworld/Makefile文件,这个是openwrt编译软件包的规则package/helloworld/Makefile文件:- ##############################################
- # 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))
Makefile语法可参考官网:http://wiki.openwrt.org/doc/devel/packages二、编译make V=99编译之后在bin/ramips/packages/base/目录下生成helloworld_1_ramips_24kec.ipk三、路由器上测试scp win@192.168.100.111:/home/win/work/helloWorld_1_ramips_24kec.ipk .安装:root@OpenWrt:/# opkg install helloworld_1_ramips_24kec.ipk Installing helloworld (1) to root...Configuring helloworld.运行:root@OpenWrt:/# helloworld hello,OpenWrt!
第二篇:
我们在trunk/bin/下编译出OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2.tar.bz2
在此,我们用到它来编译出我们的helloworld.ipk.
解压:
cd /trunk/ramips/bin
tar -xjvf OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2.tar.bz2
cd OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2
cd package
在trunk/bin/ramips/OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2/package这个目录下建立helloworld
mkdir helloworld
cd helloworld
mkdir src
cd src
vim helloworld.c
- #include <stdio.h>
- #include <unistd.h>
-
- int main(void)
- {
- printf("Hello world, why won't my code compile?\n\n");
- return 0;
- }
vim Makefile //注意TAB,不能被替换空格,Makefile的编写规则,此Makfile是编译helloworld.c- helloworld:helloworld.o
- $(CC) $(LDFLAGS) helloworld.o -o helloworld
- helloworld.o:helloworld.c
- $(CC) $(CFLAGS) -c helloworld.c
- clean:
- rm *.o helloworld
回到上一层目录,:trunk/bin/ramips/OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2/package/helloworldcd ..
vim Makefile //此Makefile是给SDK读取,编译src目录的
- ##############################################
- # 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 $(call BuildPackage,helloworld))
特别提醒:格式务必使用TAB,不然会出现编译问题。特别最后一行:- <span style="color:#FF0000;">$(eval $(call BuildPackage,helloworld))</span>
不需要TAB,当初以为这一行也需要TAB,结果怎么编译bin目录下都没有生成ipk。
回到SDK根目录:trunk/bin/ramips/OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2
执行:make V=s
最后生成目标文件都在trunk/bin/ramips/OpenWrt-SDK-ramips-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2/bin/ramips/packages:
drwxr-xr-x 2 dean dean 4096 7月 5 19:07 ./
drwxr-xr-x 3 dean dean 4096 7月 5 19:07 ../
-rw-r--r-- 1 dean dean 1796 7月 5 19:07 helloworld_1_ramips_24kec.ipk
-rw-r--r-- 1 dean dean 432 7月 5 19:07 Packages
-rw-r--r-- 1 dean dean 331 7月 5 19:07 Packages.gz
这个helloworld_1_ramips_24kec.ipk就是我们编译出来的helloworld
开发板正常运行到系统后,使用wget下载helloworld_1_ramips_24kec.ipk
安装:opkg install helloworld_1_ramips_24kec.ipk
运行:hello //打完hello按TAB自动补全,然后运行即可。
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