分类: LINUX
2011-03-15 15:51:13
step2:
#cd ./jpeg-6b
#./configure --prefix=/home/jpeg_arm --exec-prefix=/home/jpeg_arm --enable-shared --enable-static
下面分别介绍这几个参数的作用:
--prefix=/home/jpeg_arm/include : 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:
/home/jpeg_arm_include.....................................
|
+---include........................................
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---jconfig.h
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---jerror.h
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---jmorecfg.h
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---jpeglib.h
+---man............................................
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+---man1.......................................
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---cjeg.1
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---djpeg.1
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---jpegtran.1
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---rdjpgcom.1
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---wrjpgcom.1
--exec-prefix=/home/jpeg_arm/lib : 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:
/home/jpeg_arm_lib........................................
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+---bin............................................
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---cjeg
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---djpeg
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---jpegtran
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---rdjpgcom
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---wrjpgcom
+---lib...........................................
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---libjpeg.la
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---libjpeg.so
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---libjpeg.so.62
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---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:
# $(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=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=arm-linux-ar rc (同上)
# second step in .a creation (use "touch" if not needed)
AR2= ranlib 该成 AR2=arm-linux-/ranlib (同上)
step4:sudo mkdir /home/jpeg_arm
sudo mkdir /home/jpeg_arm/lib
sudo mkdir /home/jpeg_arm/include
sudo mkdir /home/jpeg_arm/man
sudo mkdir /home/jpeg_arm/lib/man/man1
step5:#make
#sudo make install
这样JPEG库就交叉编译成功了,相应的库和头文件都在/home/jpeg_arm/lib和/home/jpeg_arm/include下了!
在编写应用程序在编译时记得加上 -ljpeg