openwrt 编译相关
2016-03-26 10:56
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定制一个ipk
从helloworld开始在package目录放入helloworld目录,helloworld目录的结构如下
vmuser@vmuser-desktop:~/wtrb-env/openwrt-r32683/trunk$ find package/helloworld/ package/helloworld/ package/helloworld/src package/helloworld/src/helloworld.c package/helloworld/src/Makefile package/helloworld/Makefile
总共3个文件,src目录下的两个文件Makefile,helloworld.c和外层的Makefile文件
helloworld.c
#include <stdio.h> #include <unistd.h> int main(void) { printf("a hellowrold ipk for OpenWrt !!! \n"); return 0; }Makefile,用于编译helloworld.c
#build a Makefile for helloworld.c helloworld: helloworld.o $(CC) $(LDFLAGS) helloworld.o -o helloworld helloworld.o: helloworld.c $(CC) $(CFLAGS) -c helloworld.c clean: rm *.o helloworld
外面的Makefile 是openwrt定制的Makefile文件
############################################### #OpenWrt Makefile for helloworld program ############################################## include $(TOPDIR)/rules.mk # Name and release number of this package PKG_NAME:=helloworld PKG_RELEASE:=1.2 # 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 $(call BuildPackage,helloworld))
make menuconfig 里面选中
Utilities ---> <*> helloworld......................... Helloworld -- prints a snarky message
在根目录下执行
vmuser@vmuser-desktop:~/wtrb-env/openwrt-r32683/trunk$ make package/helloworld/compile make[1] package/helloworld/compile make[2] -C package/toolchain compile make[2] -C package/helloworld compile
会生成
bin/ar71xx/packages/helloworld_1.2_ar71xx.ipk
并把bin文件考到rootfs
staging_dir/target-mips_r2_uClibc-0.9.33.2/root-ar71xx/bin/helloworld
在源码根目录下执行make的时候,
make 的时候会把m选项的package,比如helloworld
拷贝到bin/ar71xx/packages/helloworld_1.2_ar71xx.ipk
拷贝到staging_dir/target-mips_r2_uClibc-0.9.33.2/root-ar71xx/bin/helloworld
不会拷贝到build_dir/target-mips_r2_uClibc-0.9.33.2/root-ar71xx/bin/helloworld
而y选项的package会拷贝在这3个目录下
定制一个内核模块
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