|
[假设你的交叉编译工具安装在/usr/arm目录下的]
step1:下载并解压jpeg源代码包
step2:
#cd
./jpeg-6b
#./configure --prefix=/usr/arm/arm-linux
--exec-prefix=/usr/arm/arm-linux \
--enable-shared
--enable-static
下面分别介绍这几个参数的作用:
--prefix=/usr/arm/arm-linux :
执行make install 后,会将与体系无关的文件拷贝到此目录下,具体如下:
/usr/arm/arm-linux
.....................................
|
+---include........................................
|
---jconfig.h
|
---jerror.h
|
---jmorecfg.h
|
---jpeglib.h
+---man............................................
|
+---man1.......................................
|
---cjeg.1
|
---djpeg.1
|
---jpegtran.1
|
---rdjpgcom.1
|
---wrjpgcom.1
--exec-prefix=/usr/arm/arm-linux : 执行make install
后,会将与体系无关的文件拷贝到此目录下,即将一些可执行程序、动态链接库和静态链接库拷贝到此目录的相应目录下，具体如下：
/usr/arm/arm-linux
........................................
|
+---bin............................................
|
---cjeg
|
---djpeg
|
---jpegtran
|
---rdjpgcom
|
---wrjpgcom
+---lib...........................................
|
---libjpeg.la
|
---libjpeg.so
|
---libjpeg.so.62
|
---libjpeg.so.62.0.0
--enable-shared : 用GNU
libtool编译成动态链接库
。下面分别对应有无此参数所生成的Makefile的比较:
--------------------------------------------------------------------------------------
无--enable-shared参数 |
有--enable-shared参数
--------------------------------------------------------------------------------------
LIBTOOL = | LIBTOOL =
./libtool
--------------------------------------------------------------------------------------
O = o A = a | O = lo A = la
-------------------------------------------------------------------------------------
LN= $(CC) | LN= $(LIBTOOL) --mode=link
$(CC)
--------------------------------------------------------------------------------------
INSTALL_PROGRAM= ${INSTALL} | INSTALL_PROGRAM= $(LIBTOOL) --mode=install
${INSTALL}
INSTALL_LIB= ${INSTALL} -m 644 | INSTALL_LIB= $(LIBTOOL)
--mode=install ${INSTALL}
---------------------------------------------------------------------------------------
无参数:
# .c.lo:
# $(LIBTOOL)
--mode=compile $(CC) $(CFLAGS) -c $(srcdir)/$*.c
有参数:
.c.lo:
$(LIBTOOL) --mode=compile $(CC) $(CFLAGS) -c
$(srcdir)/$*.c
------------------------------------------------------------------------------------------
无参数:
install: cjpeg djpeg jpegtran rdjpgcom
wrjpgcom
有参数:
install: cjpeg djpeg jpegtran
rdjpgcom wrjpgcom install-lib
-----------------------------------------------------------------------------------------
step3:修改生成的Makefile文件:
# The name of your C
compiler:
CC= gcc 该成 CC=/usr/arm/bin/arm-linux-gcc
(根据你自己交叉编译器的位置修改)
# library (.a) file creation command
AR=
ar rc 该成 AR= /usr/arm/bin/arm-linux-ar rc (同上)
# second step in .a
creation (use "touch" if not needed)
AR2= ranlib 该成 AR2=
/usr/arm/bin/arm-linux-ranlib (同上)
step4:#make
#make install
这样JPEG库就交叉编译成功了,相应的库和头文件都在/usr/arm/arm-linux/include
和/usr/arm/arm-linux/lib目录下了
|
安装好以后就在这2个目录下增加了如下文件：/usr/arm/arm-linux/include
jerror.h
jmorecfg.h
jconfig.h
jpeglib.h
/usr/arm/arm-linux/lib
libjpeg.a
libjpeg.la
libjpeg.so
libjpeg.so.62
libjpeg.so.62.0.0
编译程序的时候记得加上
-ljpeg
不然大概就有下面这些
/tmp/cc4aJtAS.o: In function
`write_JPEG_file':
/tmp/cc4aJtAS.o(.text+0x20): undefined reference to
`jpeg_std_error'
/tmp/cc4aJtAS.o(.text+0x3c): undefined reference to
`jpeg_CreateCompress'
/tmp/cc4aJtAS.o(.text+0x88): undefined reference to
`jpeg_stdio_dest'
/tmp/cc4aJtAS.o(.text+0xbc): undefined reference to
`jpeg_set_defaults'
/tmp/cc4aJtAS.o(.text+0xd0): undefined reference to
`jpeg_set_quality'
/tmp/cc4aJtAS.o(.text+0xe0): undefined reference to
`jpeg_start_compress'
/tmp/cc4aJtAS.o(.text+0x140): undefined reference to
`jpeg_write_scanlines'
/tmp/cc4aJtAS.o(.text+0x168): undefined reference to
`jpeg_finish_compress'
/tmp/cc4aJtAS.o(.text+0x17c): undefined reference to
`jpeg_destroy_compress'
