自己动手编译OpenJDK

<p>无聊的时候决定自己动手编译个JDK，曾经想在X86上编译一个<a href="http://en.wikipedia.org/wiki/Dalvik_(software)" target="_blank">Dalvik</a>出来玩玩，但基于那玩意是高手才玩的起的，所以自己那个想法就不了了知了<br /> 看了一圈后发现<a href="http://openjdk.java.net/" target="_blank">OpenJDK</a>还是比较容易编译的，所以就来炒份现饭<br /> 现代JDK这么容易自己编译还是归功于开源和社区</p> <p>开场白就说这么多，下面是过程记录<br /> 下载源码，解压，阅读README和README-builds.html，然后就可以开工了</p> <p>我是在Linux 2.6.35-28-generic #50-Ubuntu i686 GNU/Linux上编译的，我编译的是<a href="http://www.java.net/download/openjdk/jdk7/promoted/b141/openjdk-7-ea-src-b141-05_may_2011.zip" target="_blank">openjdk-7-ea-src-b141-05_may_2011</a>这个版本</p> <p>主要需要以下条件<br /> Basic Linux Check List<br /> 1. Install the Bootstrap JDK, set ALT_BOOTDIR.<br /> 2. Optional Import JDK, set ALT_JDK_IMPORT_PATH.(可以不要，如果你是完全编译的话)<br /> 3. Install or upgrade the FreeType development package.(这个基本有了)<br /> 4. Install Ant 1.7.1 or newer, make sure it is in your PATH.</p> <p>然后在环境变量下做些设置<br /> ALT_BOOTDIR=$SUN_JDK1.6.0_25_HOME(我是用的SUN的JDK6来作为Bootstrap JDK的)<br /> LANG=C(需要设置成这样，否则编译会报错，Linux一般是zh_CN.utf8改下就可以)<br /> ALT_CUPS_HEADERS_PATH=$CUPS_HOME/include(何为<a href="http://www.cups.org/" target="_blank">CUPS</a>，<a href="http://www.cups.org/" target="_blank">见此</a>)</p> <p>另外环境变量中不要出现JAVA_HOME，CLASSPATH，有的话就把它们注释掉</p> <p>记得使修改过的环境变量生效</p> <p>然后就cd到$openjdk_src下开始执行make sanity检测<br /> 成功的话就执行make all ALLOW_DOWNLOADS=true WARNINGS_ARE_ERRORS=开始较为耗时的编译之旅</p> <p>这两个参数的意思还是比较明白<br /> ALLOW_DOWNLOADS=true就是编译的时候发现缺少某些预知的源码或依赖时，它会自动去下载，前提是必须联网<br /> WARNINGS_ARE_ERRORS=就是禁止编译器把一些警告当错误，如果不加这个就可能会因为类似于这样的cc1plus: warnings being treated as errors提示而终止编译，这不是我们所希望的</p> <p>但是不要高兴的太早，多多少少可能会遇到点问题，不过找找Google应该都能解决</p> <p>下面贴出我在编译的时候遇到的问题<br /> 1、<br /> <ins datetime="2011-05-12T13:47:20+00:00">/home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/hotspot/src/os/linux/vm/os_linux.cpp<br /> cc1plus: warnings being treated as errors<br /> /home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/hotspot/src/os/linux/vm/os_linux.cpp: In static member function ‘static bool os::Linux::hugetlbfs_sanity_check(bool, size_t)’:<br /> /home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/hotspot/src/os/linux/vm/os_linux.cpp:2853: error: use of assignment suppression and length modifier together in gnu_scanf format<br /> make[6]: *** [os_linux.o] Error 1<br /> make[6]: Leaving directory `/home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/build/linux-i586/hotspot/outputdir/linux_i486_compiler2/product’</ins></p> <p>WARNINGS_ARE_ERRORS=</p> <p>2、<br /> <ins datetime="2011-05-12T13:47:20+00:00">../../../src/solaris/native/sun/awt/awt.h:38: fatal error: X11/Intrinsic.h: No such file or directory<br /> compilation terminated.<br /> make[5]: *** [/home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/build/linux-i586/tmp/sun/sun.awt/awt/obj/BufImgSurfaceData.o] Error 1<br /> make[5]: *** Waiting for unfinished jobs….<br /> make[5]: Leaving directory `/home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/jdk/make/sun/awt’<br /> make[4]: *** [library_parallel_compile] Error 2<br /> make[4]: Leaving directory `/home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/jdk/make/sun/awt’<br /> make[3]: *** [all] Error 1<br /> make[3]: Leaving directory `/home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/jdk/make/sun’<br /> make[2]: *** [all] Error 1<br /> make[2]: Leaving directory `/home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/jdk/make’<br /> make[1]: *** [jdk-build] Error 2<br /> make[1]: Leaving directory `/home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011′<br /> make: *** [build_product_image] Error 2</ins></p> <p>sudo apt-get install libxt-dev</p> <p>3、<br /> <ins datetime="2011-05-12T13:47:20+00:00">../../../src/solaris/native/sun/xawt/XToolkit.c:48: fatal error: X11/extensions/XTest.h: No such file or directory<br /> compilation terminated.<br /> make[5]: *** [/home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/build/linux-i586/tmp/sun/sun.awt.X11/xawt/obj/XToolkit.o] Error 1<br /> make[5]: *** Waiting for unfinished jobs….<br /> make[5]: Leaving directory `/home/guohai/dev/src/java/openjdk-7-ea-src-b141-05_may_2011/jdk/make/sun/xawt’<br /> make[4]: *** [library_parallel_compile] Error 2</ins></p> <p>sudo apt-get install libxtst-dev</p> <p>从2011-05-12 20:39开始编译，遇到问题，前前后后经历了近一个小时<br /> 另外如果编译出错了，并且你解决了错误，貌似你只需要继续执行make all ALLOW_DOWNLOADS=true WARNINGS_ARE_ERRORS=<br /> 就可以了，它会接着编译，而不需要从头开始编译<br /> 当你看到下面这种提示时<br /> — Build times ———-<br /> Target all_product_build<br /> Start 2011-05-12 21:28:48<br /> End 2011-05-12 21:37:48<br /> 00:00:04 corba<br /> 00:00:12 hotspot<br /> 00:00:03 jaxp<br /> 00:00:05 jaxws<br /> 00:08:32 jdk<br /> 00:00:04 langtools<br /> 00:09:00 TOTAL<br /> ————————-<br /> 应该就可以完工了，cd到$openjdk_src/build/platform/下，看看j2sdk-image和j2re-image中的内容是不是很熟悉？<br /> cd$openjdk_src/build/platform/bin/下执行如下命令就应该可以看到结果，当然版本，硬件架构可能不一样<br /> 总之你就自己编译出了一个带自己名字的JDK了</p> <p>$openjdk_src/build/linux-i586/bin$ ./java -version<br /> openjdk version “1.7.0-internal”<br /> OpenJDK Runtime Environment (build 1.7.0-internal-guohai_2011_05_12_20_39-b00)<br /> OpenJDK Server VM (build 21.0-b11, mixed mode)</p> <p>$openjdk_src/build/linux-i586/bin$ ./javac -version<br /> javac 1.7.0-internal</p> <p>有图<br /> <a href="http://www.flickr.com/photos/46848122@N08/5712770049/" title="compile-my-openjdk by DeliberateKids, on Flickr" target="_blank"><img src="https://farm3.static.flickr.com/2279/5712770049_af4be72b00.jpg" width="500" height="61" alt="compile-my-openjdk"></a></p> <p>编译成功之后再把那些需要改回来的东西改回来</p> <p><code><br /> sudo apt-get install libfreetype6-dev<br /> sudo apt-get install libasound2-dev<br /> sudo apt-get install libcups2-dev<br /> </code></p>