从http://www.ijg.org/files/网站下载lib库的源文件.
开工:
tar -xzvf jpeg-6b.tar.gz cd jpeg-6b mkdir /opt/jpeg/jpeg-6b-release ./configure CC=mipsel-linux-gcc --prefix=/opt/jpeg/jpeg-6b-release --enable-shared --enable-static --host=mipsel-linux mkdir /opt/jpeg/jpeg-6b-release/bin mkdir /opt/jpeg/jpeg-6b-release/include mkdir /opt/jpeg/jpeg-6b-release/lib mkdir /opt/jpeg/jpeg-6b-release/man mkdir /opt/jpeg/jpeg-6b-release/man/man1 make
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出错:
[root@localhost jpeg-6b]# make ./libtool --mode=compile mipsel-linux-gcc -O2 -I. -c ./jcapimin.c make: ./libtool: Command not found make: *** [jcapimin.lo] Error 127
所以,我们得先安装 libtool工具。
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从http://download.chinaunix.net/download/0007000/6039.shtml下载
得到: libtool-2.4.2.tar.xz
放到我们的Linux系统中:
网上说,tar.xz文件解压 有2中办法:
方式1:
tar xvfJ ***.tar.xz
方式2:
xz -d ***.tar.xz
tar -xvf ***.tar
我用方法1尝试,报错:
[root@localhost jpeg]# tar xvfJ libtool-2.4.2.tar.xz tar: invalid option -- J Try `tar --help' or `tar --usage' for more information. [root@localhost jpeg]# tar xvfj libtool-2.4.2.tar.xz bzip2: (stdin) is not a bzip2 file. tar: Child returned status 2 tar: Error exit delayed from previous errors
于是,我采用方法2:
[root@localhost jpeg]# xz -d libtool-2.4.2.tar.xz
bash: xz: command not found
好吧, 我去给你安装个xz工具,从 http://tukaani.org/xz/xz-4.999.9beta.tar.bz2
上面下载得到 xz-4.999.9beta.tar.bz2。
1、tar -jxvf xz-4.999.9beta.tar.bz2
2、cd xz-4.999.9beta
3、./configure --prefix=/
4、make && make install
OK, 去之前的目录,然后 xz -d libtool-2.4.2.tar.xz
得到: libtool-2.4.2.tar
然后:tar -xvf libtool-2.4.2.tar
得到: libtool-2.4.2 文件夹。
$ cd libtool-2.2.4/
[root@localhost libtool-2.4.2]# ./configure CC=mipsel-linux-gcc --host=mipsel-linux --build=mipsel-linux --prefix=/opt/jpeg/libtool-release ## ------------------------- ## ## Configuring libtool 2.4.2 ## ## ------------------------- ## checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking build system type... mipsel-unknown-linux-gnu checking host system type... mipsel-unknown-linux-gnu configure: autobuild project... GNU Libtool configure: autobuild revision... 2.4.2 () configure: autobuild hostname... localhost.localdomain configure: autobuild mode... default configure: autobuild timestamp... 20121116T063533Z checking for mipsel-linux-gcc... mipsel-linux-gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... configure: error: in `/opt/jpeg/libtool-2.4.2': configure: error: cannot run C compiled programs. If you meant to cross compile, use `--host'. See `config.log' for more details 后来改为: [root@localhost libtool-2.4.2]# ./configure CC=mipsel-linux-gcc --host=mipsel-linux --prefix=/opt/jpeg/libtool-release 配置通过。
$ make && make install [root@localhost libtool-2.4.2]# ls ../libtool-release/bin libtool libtoolize [root@localhost libtool-2.4.2]# cp ../libtool-release/bin/* ../jpeg-6b/ [root@localhost libtool-2.4.2]# cd ../jpeg-6b ./configure CC=mipsel-linux-gcc --prefix=/opt/jpeg/jpeg-6b-release --enable-shared --enable-static --host=mipsel-linux make && mak install
至此,得到我们的文件在 jpeg-6b-release 目录下面。
下面我们再延伸一下,将8d版本的库也编译了吧。
[root@localhost jpeg]# cp /mnt/hgfs/jpeg_lib/jpegsrc.v8d.tar.gz ./ [root@localhost jpeg]# tar zxvf jpegsrc.v8d.tar.gz [root@localhost jpeg-8d]# ./configure CC=mipsel-linux-gcc --prefix=/opt/jpeg/jpeg-8d-release --enable-shared --enable-static --host=mipsel-linux [root@localhost jpeg-8d]# make && make install [root@localhost jpeg-8d]# cd ../jpeg-8d-release/ [root@localhost jpeg-8d-release]# tree . |-- bin | |-- cjpeg | |-- djpeg | |-- jpegtran | |-- rdjpgcom | `-- wrjpgcom |-- include | |-- jconfig.h | |-- jerror.h | |-- jmorecfg.h | `-- jpeglib.h |-- lib | |-- libjpeg.a | |-- libjpeg.la | |-- libjpeg.so -> libjpeg.so.8.4.0 | |-- libjpeg.so.8 -> libjpeg.so.8.4.0 | `-- libjpeg.so.8.4.0 |-- man | `-- man1 | |-- cjpeg.1 | |-- djpeg.1 | |-- jpegtran.1 | |-- rdjpgcom.1 | `-- wrjpgcom.1 `-- share `-- man `-- man1 |-- cjpeg.1 |-- djpeg.1 |-- jpegtran.1 |-- rdjpgcom.1 `-- wrjpgcom.1 8 directories, 24 files
至此, 我们的8d版本的JPEG库也编译通过了,哈哈。。
现在我们回过头来看看xz文件的压缩作用如何:
-rwxr-xr-x 1 root root 11929600 2012-11-16 01:11 libtool-2.4.2.tar
-rwxrwxrwx 1 root root 868760 2012-11-16 01:09 libtool-2.4.2.tar.xz
事实证明,xz在压缩文件方面还是相当优秀的的。。
经网上查阅资料,xz文件的压缩和解压步骤如下:
创建tar.xz文件:只要先 tar cvf xxx.tar xxx/ 这样创建xxx.tar文件先,然后使用 xz -z xxx.tar 来将 xxx.tar压缩成为 xxx.tar.xz
解压tar.xz文件:先 xz -d xxx.tar.xz 将 xxx.tar.xz解压成 xxx.tar 然后,再用 tar xvf xxx.tar来解包。