openwrt使用sdk编译应用程序

原文地址：http://blog.csdn.net/luck_good/article/details/23517135

在openwrt源码目录下make menuconfig时，选择 [*] Build the OpenWrt SDK ，之后就会在bin/ar71xx/下生产SDK文件OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2.tar.bz2

解压之后就是OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2，此目录结构跟openwrt的目录结构基本一致

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1. song@song-virtual-machine:attitude_adjustment# ls bin/ar71xx/OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2
2. bin Config.in docs include logs package Packages.gz rules.mk staging_dir tmp
3. build_dir dl feeds.conf.default LICENSE Makefile Packages README.SDK scripts target

song@song-virtual-machine:attitude_adjustment# ls bin/ar71xx/OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2
bin        Config.in  docs                include  logs      package   Packages.gz  rules.mk  staging_dir  tmp
build_dir  dl         feeds.conf.default  LICENSE  Makefile  Packages  README.SDK   scripts   target

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1. song@song-virtual-machine:attitude_adjustment# ls
2. bin build_dir dl feeds.conf.default LICENSE Makefile README scripts target toolchain
3. BSDmakefile Config.in docs feeds include logs package rules.mk staging_dir tmp tools

song@song-virtual-machine:attitude_adjustment# ls
bin          build_dir  dl    feeds.conf.default  LICENSE  Makefile  README    scripts      target  toolchain
BSDmakefile  Config.in  docs  feeds           include             logs     package   rules.mk  staging_dir  tmp     tools

概述：源码在SDK/pakage目录，生成文件在SDK/bin/ar71xx/packages目录。如果没有SDK/bin/ar71xx/packages目录也可手动创建。SDK/bin/packages目录没用到。
1.在OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2/package目录下新建helloworld目录

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1. song@song-virtual-machine:package$ ls
2. helloworld Makefile rules.mk

song@song-virtual-machine:package$ ls
helloworld  Makefile  rules.mk

2.在helloworld目录下新建Makefile文件和src目录

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1. song@song-virtual-machine:helloworld$ ls
2. Makefile src

song@song-virtual-machine:helloworld$ ls
Makefile  src

此Makefile内容

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1. ##############################################
2. # OpenWrt Makefile for helloworld program
3. #
4. #
5. # Most of the variables used here are defined in
6. # the include directives below. We just need to
7. # specify a basic description of the package,
8. # where to build our program, where to find
9. # the source files, and where to install the
10. # compiled program on the router.
11. #
12. # Be very careful of spacing in this file.
13. # Indents should be tabs, not spaces, and
14. # there should be no trailing whitespace in
15. # lines that are not commented.
16. #
17. ##############################################
19. include $(TOPDIR)/rules.mk
21. # Name and release number of this package
22. PKG_NAME:=helloworld
23. PKG_RELEASE:=1
26. # This specifies the directory where we're going to build the program.
27. # The root build directory, $(BUILD_DIR), is by default the build_mipsel
28. # directory in your OpenWrt SDK directory
29. PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
32. include $(INCLUDE_DIR)/package.mk
36. # Specify package information for this program.
37. # The variables defined here should be self explanatory.
38. # If you are running Kamikaze, delete the DESCRIPTION
39. # variable below and uncomment the Kamikaze define
40. # directive for the description below
41. define Package/helloworld
42. SECTION:=utils
43. CATEGORY:=Utilities
44. TITLE:=Helloworld -- prints a snarky message
45. endef
48. # Uncomment portion below for Kamikaze and delete DESCRIPTION variable above
49. define Package/helloworld/description
50. If you can't figure out what this program does, you're probably
51. brain-dead and need immediate medical attention.
52. endef
56. # Specify what needs to be done to prepare for building the package.
57. # In our case, we need to copy the source files to the build directory.
58. # This is NOT the default. The default uses the PKG_SOURCE_URL and the
59. # PKG_SOURCE which is not defined here to download the source from the web.
60. # In order to just build a simple program that we have just written, it is
61. # much easier to do it this way.
62. define Build/Prepare
63. mkdir -p $(PKG_BUILD_DIR)
64. $(CP) ./src/* $(PKG_BUILD_DIR)/
65. endef
68. # We do not need to define Build/Configure or Build/Compile directives
69. # The defaults are appropriate for compiling a simple program such as this one
72. # Specify where and how to install the program. Since we only have one file,
73. # the helloworld executable, install it by copying it to the /bin directory on
74. # the router. The $(1) variable represents the root directory on the router running
75. # OpenWrt. The $(INSTALL_DIR) variable contains a command to prepare the install
76. # directory if it does not already exist. Likewise $(INSTALL_BIN) contains the
77. # command to copy the binary file from its current location (in our case the build
78. # directory) to the install directory.
79. define Package/helloworld/install
80. $(INSTALL_DIR) $(1)/bin
81. $(INSTALL_BIN) $(PKG_BUILD_DIR)/helloworld $(1)/bin/
82. endef
85. # This line executes the necessary commands to compile our program.
86. # The above define directives specify all the information needed, but this
87. # line calls BuildPackage which in turn actually uses this information to
88. # build a package.
89. $(eval $(call BuildPackage,helloworld))

##############################################
# 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))

3.在src目录下新建helloworld.c文件和Makefile文件，分别如下

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1. #include
2. int main(void)
3. {
4. printf("yyyy\n");
5. return 0;
6. }

#include
int main(void)
{
	printf("yyyy\n");
	return 0;
}

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1. # build helloworld executable when user executes "make"
3. helloworld: helloworld.o
4. $(CC) $(LDFLAGS) helloworld.o -o helloworld
6. helloworld.o: helloworld.c
7. $(CC) $(CFLAGS) -c helloworld.c
9. # remove object files and executable when user executes "make clean"
10. clean:
11. rm *.o helloworld

# 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

4.在OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2目录下执行编译

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1. song@song-virtual-machine:OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2$ make V=s

song@song-virtual-machine:OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2$ make V=s

5.成功之后会在OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2/bin/ar71xx/packages/ 下生产helloworld_1_ar71xx.ipk

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1. song@song-virtual-machine:OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2$ ls bin/ar71xx/packages/
2. helloworld_1_ar71xx.ipk Packages Packages.gz

song@song-virtual-machine:OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2$ ls bin/ar71xx/packages/
helloworld_1_ar71xx.ipk  Packages  Packages.gz

6.拷贝ipk到板子执行

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1. opkg install helloworld_1_ar71xx.ipk

opkg install helloworld_1_ar71xx.ipk

会生成/bin/helloworld

通过opkg list可查看