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一、OpenWrt源代码获取与编译
1.1、搭建环境 下载OpenWrt的官方源码#xff1a;
git clone https://github.com/openwrt/openwrt.git1.2、安装编译依赖项
sudo apt update… 编译OpenWrt的应用程序可以参考OpenWrt内部其他应用程序的例程来编写成自己的应用程序
一、OpenWrt源代码获取与编译
1.1、搭建环境 下载OpenWrt的官方源码
git clone https://github.com/openwrt/openwrt.git
1.2、安装编译依赖项
sudo apt update -y
sudo apt full-upgrade -y
sudo apt install -y ack antlr3 asciidoc autoconf automake autopoint binutils bison build-essential \
bzip2 ccache cmake cpio curl device-tree-compiler fastjar flex gawk gettext gcc-multilib g-multilib \
git gperf haveged help2man intltool libc6-dev-i386 libelf-dev libglib2.0-dev libgmp3-dev libltdl-dev \
libmpc-dev libmpfr-dev libncurses5-dev libncursesw5-dev libreadline-dev libssl-dev libtool lrzsz \
mkisofs msmtp nano ninja-build p7zip p7zip-full patch pkgconf python2.7 python3 python3-pyelftools \
libpython3-dev qemu-utils rsync scons squashfs-tools subversion swig texinfo uglifyjs upx-ucl unzip \
vim wget xmlto xxd zlib1g-dev python3-setuptools
1.3、更新 feeds 进入openwrt目录后执行以下指令 ./scripts/feeds update -a
./scripts/feeds install -a
1.4、配置编译选项 根据自己的平台来选择编译选项
make menuconfig1.5、下载 dl 库 进入openwrt目录后执行以下指令
make download -j81.6、编译
make Vs -j1二、OpenWrt应用源代码分析 OpenWrt应用源代码存放目录为package/utils 以fbtest应用程序为例进行分析。在fbtest文件夹下面有一个Makefile文件和src文件夹而src文件夹下有模块源码fbtest.c和源码编译Makefile
2.1、顶层makefile分析 顶层makefile内容如下
#
# Copyright (C) 2012 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#include $(TOPDIR)/rules.mkPKG_NAME:fbtest
PKG_RELEASE:1PKG_BUILD_DIR : $(BUILD_DIR)/$(PKG_NAME)include $(INCLUDE_DIR)/package.mkdefine Package/fbtestSECTION:utilsCATEGORY:UtilitiesTITLE:Frame buffer device testing toolDEPENDS:DISPLAY_SUPPORT
endefdefine Build/Configure
endefdefine Build/Compile$(MAKE) -C $(PKG_BUILD_DIR) \CC$(TARGET_CC) \CFLAGS$(TARGET_CFLAGS) -Wall \LDFLAGS$(TARGET_LDFLAGS)
endefdefine Package/fbtest/install$(INSTALL_DIR) $(1)/usr/sbin$(INSTALL_BIN) $(PKG_BUILD_DIR)/fbtest $(1)/usr/sbin/
endef$(eval $(call BuildPackage,fbtest))
2.2、源码makefile
CC gcc
CFLAGS -Wall
OBJS fbtest.oall: fbtest%.o: %.c$(CC) $(CFLAGS) -c -o $ $fbtest: $(OBJS)$(CC) -o $ $(OBJS)clean:rm -f fbtest *.o
2.3、源码fbtest.c fbtest.c就是应用程序的实际代码
三、编写自己的OpenWrt应用代码 将fbtest文件夹复制为myapp_test放置到fbtest相同的目录下
3.1、顶层makefile 修改顶层makefile如下
#
# Copyright (C) 2012 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#include $(TOPDIR)/rules.mkPKG_NAME:myapp_test
PKG_RELEASE:1PKG_BUILD_DIR : $(BUILD_DIR)/$(PKG_NAME)include $(INCLUDE_DIR)/package.mkdefine Package/myapp_testSECTION:utilsCATEGORY:UtilitiesTITLE:Frame buffer device testing toolDEPENDS:DISPLAY_SUPPORT
endefdefine Build/Configure
endefdefine Build/Compile$(MAKE) -C $(PKG_BUILD_DIR) \CC$(TARGET_CC) \CFLAGS$(TARGET_CFLAGS) -Wall \LDFLAGS$(TARGET_LDFLAGS)
endefdefine Package/myapp_test/install$(INSTALL_DIR) $(1)/usr/sbin$(INSTALL_BIN) $(PKG_BUILD_DIR)/myapp_test $(1)/usr/sbin/
endef$(eval $(call BuildPackage,myapp_test))
3.2、源码makefile
CC gcc
CFLAGS -Wall
OBJS myapp_test.oall: myapp_test%.o: %.c$(CC) $(CFLAGS) -c -o $ $myapp_test: $(OBJS)$(CC) -o $ $(OBJS)clean:rm -f myapp_test *.o
3.3、源码myapp_test.c #include stdio.h
#include stdlib.h
#include unistd.h
#include string.h#include sys/types.h
#include sys/stat.h
#include sys/ioctl.h
#include sys/mman.h
#include fcntl.hint main (int argc,char **argv)
{printf (myapp_test\n);return 0;
}
四、编译自己的OpenWrt应用代码
4.1、配置 在OpenWrt源码顶级目录下输入下面的命令配置内核
make menuconfig 依次按照如下顺序选择
4.2、编译 在OpenWrt源码顶级目录下输入下面的命令编译应用程序
make package/myapp_test/compile Vs编译完成之后会在下面的目录中看到我们的应用程序 此应用程序和普通的linux应用程序的装载方法一样不再赘述。
