http://blog.csdn.net/woods2001/article/details/8137755

2012

一,、交叉編譯

1.      建立交叉編譯環(huán)境

在使用buildroot對(duì)openwrt進(jìn)行編譯之后，在buildroot目錄下會(huì)有一個(gè)名叫staging_dir的目錄，針對(duì)當(dāng)前平臺(tái)的toolchain都在這個(gè)目錄下,。

1.1增加toolchain的目錄到PATH目錄中

Vim ~/.bash_profile

添加代碼：

# add openWrt cross-compile path

PATH=$PATH:/home/jason/openWrt/trunk/staging_dir/toolchain-i386_gcc-4.6-linaro_uClibc-0.9.33.2/bin/

1.2   增加staging_dir的目錄到toolchain PATH

Vim ~/.bash_profile

添加代碼：

STAGING_DIR=/home/jason/openWrt/trunk/staging_dir/

exportSTAGING_DIR

1.3 保存退出

2.      編譯

2.1 configure

 ./configure--target=i486-openwrt-linux-uclibc

2.2 make

make CC=i486-openwrt-linux-uclibc-gcc LD=i486-openwrt-linux-uclibc-ld

二,、編譯ipk包

1.      編譯SDK

在buildroot目錄下make menuconfig，然后選中SDK進(jìn)行編譯

選中后,，進(jìn)行make編譯,。

編譯完成后，對(duì)應(yīng)生成的SDK會(huì)出現(xiàn)類(lèi)似這樣的目錄：“openWrt/trunk/bin/x86”,，進(jìn)入SDK后,，打印當(dāng)前工作路徑如下：

“/openWrt/trunk/bin/x86/OpenWrt-SDK-x86-for-redhat-x86_64-gcc-4.6-linaro_uClibc-0.9.33.2”

2.      創(chuàng)建工程

在sdk的package目錄下創(chuàng)建我們的工程“helloworld”:

新建目錄中包含src目錄，這個(gè)目錄就是我們的源代碼所在地,，另外一個(gè)非常重要的文件Makefile,，這個(gè)Makefile的組成與GNU的有所不同，有點(diǎn)類(lèi)似于制作rpm包時(shí)的spec文件,。到后面會(huì)有更詳細(xì)的介紹,。以下是具體文件的位置：

其中helloworld.c的內(nèi)容如下：

Src目錄下的Makefile文件內(nèi)容如下：

最后是helloworld目錄下的Makefile的內(nèi)容：

##############################################

# OpenWrtMakefile for helloworld program

#

#

# Most ofthe variables used here are defined in

# theinclude directives below. We just need to

# specifya basic description of the package,

# whereto build our program, where to find

# thesource files, and where to install the

#compiled program on the router.

#

# Be verycareful of spacing in this file.

# Indentsshould be tabs, not spaces, and

# thereshould be no trailing whitespace in

# linesthat are not commented.

#

##############################################

include$(TOPDIR)/rules.mk

# Nameand release number of this package

PKG_NAME:=helloworld

PKG_RELEASE:=1

# Thisspecifies the directory where we're going to build the program.

# Theroot 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

# Specifypackage information for this program.

# Thevariables defined here should be self explanatory.

# If youare running Kamikaze, delete the DESCRIPTION

#variable below and uncomment the Kamikaze define

# directivefor the description below

definePackage/helloworld

SECTION:=utils

CATEGORY:=Utilities

TITLE:=Helloworld-- prints a snarky message

endef

# Specifywhat needs to be done to prepare for building the package.

# In ourcase, we need to copy the source files to the build directory.

# This isNOT the default.  The default uses thePKG_SOURCE_URL and the

#PKG_SOURCE which is not defined here to download the source from the web.

# Inorder to just build a simple program that we have just written, it is

# mucheasier to do it this way.

defineBuild/Prepare

mkdir -p $(PKG_BUILD_DIR)

$(CP) ./src/* $(PKG_BUILD_DIR)/

endef

# We donot need to define Build/Configure or Build/Compile directives

# Thedefaults are appropriate for compiling a simple program such as this one

# Specifywhere and how to install the program. Since we only have one file,

# thehelloworld executable, install it by copying it to the /bin directory on

# therouter. 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

# commandto copy the binary file from its current location (in our case the build

#directory) to the install directory.

definePackage/helloworld/install

$(INSTALL_DIR) $(1)/bin

$(INSTALL_BIN) $(PKG_BUILD_DIR)/helloworld$(1)/bin/

endef

# Thisline executes the necessary commands to compile our program.

# Theabove define directives specify all the information needed, but this

# linecalls BuildPackage which in turn actually uses this information to

# build apackage.

$(eval $(call BuildPackage,helloworld))

這個(gè)Makefile的語(yǔ)法規(guī)則還是參考官網(wǎng)吧：

http://wiki./doc/devel/packages

3.      編譯

將當(dāng)前目錄返回到SDK：

執(zhí)行make進(jìn)行編譯。如果一切順利,，最后的結(jié)果會(huì)保存在SDK/bin/x86/packages目錄下,，名稱(chēng)為helloword_1_x86.ipk。

4.      安裝最新編譯的包

通過(guò)scp將該包拷貝到目的機(jī)器上,，通過(guò)opkg包管理工具進(jìn)行安裝：

Opkg install helloworld_1_x86.ipk

一切順利,，包安裝成功，在當(dāng)前路徑下執(zhí)行helloworld查看程序執(zhí)行結(jié)果,。