SDK
中其实是包含toolchain
的,SDK
就是将编译好的文件在打包到一个ipk
中,便于安装。SDK
与toolchain
一样,可以自己编译也可以从网上下载。SDK
生成ipk
包时需要的只是一个makefile
文件,makefile
里写了所需下载的文件、生成规则、软件版本、类型等。makefile
的写法可以到openwrt
的官方wiki
中找到。
在package
目录下创建项目目录:
$ mkdir helloworld
$ mkdir helloworld/src
helloworld/src
目录下创建源码文件helloworld.c
:
#include <stdio.h>
int main(int argc, char** argv)
{
printf("hello world!\n");
return 0;
}
helloworld/src
目录下创建Makefile
:
# 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
在helloworld
目录下创建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
编译:
$ make package/helloworld/compile -j1 V=s
$ ls bin/ramips/packages/base/helloworld_1_ramips_24kec.ipk
bin/ramips/packages/base/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 world!
参考文章
Openwrt之helloworld
openWRT自学---如何开发新的用户态模块-helloworld
用CMakeLists.txt替代makefile创建openwrt软件包
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