在CentOS下编译OpenJDK6过程

由于初次手动编译OpenJDK6, 踩的坑还不少, 各种依赖不足以及奇葩的事情, 特此整理记录, 给后人防坑.
编译环境信息:

[root@dev-52 ~]# uname -aLinux dev-52 2.6.32-220.el6.x86_64 #1 SMP Tue Dec 6 19:48:22 GMT 2011 x86_64 x86_64 x86_64 GNU/Linux[root@dev-52 openjdk6]# arch && cat /etc/centos-release x86_64CentOS release 6.2 (Final)[root@dev-52 openjdk6]# nproc 8[root@dev-52 ~]# free -m             total       used       free     shared    buffers     cachedMem:          7872       7695        176          0        158       6794-/+ buffers/cache:        742       7129Swap:         5823          0       5823

OpenJDK版本: openjdk-6-src-b27-26_oct_2012.tar.gz
下载地址: https://java.net/projects/openjdk6/downloads/

[root@dev-52 ~]# mkdir openjdk6 && tar xf openjdk-6-src-b27-26_oct_2012.tar.gz -C openjdk6[root@dev-52 ~]# ll openjdk6總計 320-rw-rw-r-- 1 uucp 143   1503 2012-10-27 02:21 ASSEMBLY_EXCEPTIONdrwxrwxr-x 4 uucp 143   4096 2012-10-27 02:28 corba-rw-rw-r-- 1 uucp 143   1373 2012-10-27 02:21 get_source.shdrwxrwxr-x 6 uucp 143   4096 2012-10-27 02:28 hotspotdrwxrwxr-x 5 uucp 143   4096 2012-10-27 02:28 jaxpdrwxrwxr-x 5 uucp 143   4096 2012-10-27 02:28 jaxwsdrwxrwxr-x 5 uucp 143   4096 2012-10-27 02:28 jdkdrwxrwxr-x 5 uucp 143   4096 2012-10-27 02:29 langtools-rw-rw-r-- 1 uucp 143  19263 2012-10-27 02:21 LICENSEdrwxrwxr-x 4 uucp 143   4096 2012-10-27 02:28 make-rw-rw-r-- 1 uucp 143  14485 2012-10-27 02:21 Makefile-rw-rw-r-- 1 uucp 143   1803 2012-10-27 02:21 README-rw-rw-r-- 1 uucp 143 101427 2012-10-27 02:21 README-builds.html-rw-rw-r-- 1 uucp 143   4807 2012-10-27 02:21 ReleaseProcess.htmldrwxrwxr-x 2 uucp 143   4096 2012-10-27 02:28 test-rw-rw-r-- 1 uucp 143 127498 2012-10-27 02:21 THIRD_PARTY_README-rw-rw-r-- 1 uucp 143   2113 2012-10-27 02:21 TRADEMARK# 安装依赖, 编译OpenJDK需要先安装一个JDK, 无论是OpenJDK还是Oracle JDK都行[root@dev-52 ~]# yum install java-1.6.0-openjdk alsa-lib-devel gawk binutils libpng-devel freetype-devel openmotif openmotif-devel cups-devel ant libXtst-devel -y# 将编译参数全部写到一个脚本中[root@dev-52 openjdk6]# cd openjdk6[root@dev-52 openjdk6]# vim build.sh #!/bin/bashexport OPENJDK_HOME=/root/openjdk6 # 解压的源码包位置export LANG=Cexport ALT_BOOTDIR=/usr/lib/jvm/java-1.6.0-openjdk.x86_64 # 机器上现有的JDK位置, 下面一样export ALT_JDK_IMPORT_PATH=/usr/lib/jvm/java-1.6.0-openjdk.x86_64export ALT_OUTPUTDIR=$OPENJDK_HOME/build # 编译输出目录export ALLOW_DOWNLOADS=trueexport HOTSPOT_BUILD_JOBS=8 # 编译线程数, 与CPU核数一致即可export ALT_PARALLEL_COMPILE_JOBS=8export DEV_ONLY=trueexport USE_PRECOMPILED_HEADER=trueexport BUILD_LANGTOOLS=trueexport BUILD_JAXP=false # 下面三个组件编译时需要从网络上下载相关依赖包, 耗时较长且对于作者没有任何用处就取消编译了export BUILD_JAXWS=falseexport BUILD_CORBA=falseexport BUILD_HOTSPOT=trueexport BUILD_JDK=trueexport BUILD_DEPLOY=false # 取消构建部署和安装包export BUILD_INSTALL=falseunset JAVA_HOMEunset CLASSPATHmake sanity # 验证[root@dev-52 openjdk6]# chmod +x build.sh [root@dev-52 openjdk6]# ./build.sh # 由于输出内容过长占用篇幅较大就不完全贴出来了, 尾部的输出如下:WARNING: You are not building the JAXP sources.         The jaxp files will be obtained from          the location set in ALT_JDK_IMPORT_PATH. WARNING: You are not building the JAXWS sources.         The jaxws files will be obtained from          the location set in ALT_JDK_IMPORT_PATH. WARNING: You are not building the CORBA sources.         The corba files will be obtained from          the location set in ALT_JDK_IMPORT_PATH. WARNING: Your build environment has the variable DEV_ONLY         defined. This will result in a development-only         build of the JDK, lacking the documentation         build and installation bundles.Sanity check passed. # 检查通过# 修改build.sh的最后一行为如下, 然后在此执行脚本: make sanity && make 2>&1 | tee $ALT_OUTPUTDIR/build.log[root@dev-52 openjdk6]# ./build.sh # 自2015年开始一般会出现如下异常/opt/jdk1.6.0_31/bin/java  -Xmx896m -Xms128m -XX:PermSize=32m -XX:MaxPermSize=160m -jar /root/openjdk6/build/btjars/generatecurrencydata.jar -o /root/openjdk6/build/lib/currency.data.temp \                < ../../../src/share/classes/java/util/CurrencyData.propertiesError: time is more than 10 years from present: 1120165200000java.lang.RuntimeException: time is more than 10 years from present: 1120165200000        at build.tools.generatecurrencydata.GenerateCurrencyData.makeSpecialCaseEntry(GenerateCurrencyData.java:285)        at build.tools.generatecurrencydata.GenerateCurrencyData.buildMainAndSpecialCaseTables(GenerateCurrencyData.java:225)        at build.tools.generatecurrencydata.GenerateCurrencyData.main(GenerateCurrencyData.java:154)make[4]: *** [/root/openjdk6/build/lib/currency.data] Error 1# 通过修改CurrencyData.properties文件, 把10年之前的时间修改为10年之内即可# 部分amd64架构的机器可能会出现如下异常cd linux_amd64_compiler2/product && ./test_gammajava full version "1.6.0_36-b36"./gamma: relocation error: /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.36.x86_64/jre/lib/amd64/libjava.so: symbol JVM_FindClassFromCaller, version SUNWprivate_1.1 not defined in file libjvm.so with link time reference# 主要是由于OpenJDK的一个bug导致的, 把OpenJDK替换为Oracle JDK即可, 注意同时修改build.sh中的内容[root@dev-52 openjdk6]# vim `find . -name 'CurrencyData.properties'`# 编译完成后末尾输出如下, 也可检查程序的退出码:>>>Making sec-files-win @ Mon Sep  7 15:06:20 CST 2015 ...>>>Making jgss-files @ Mon Sep  7 15:06:20 CST 2015 ...>>>Finished making images @ Mon Sep  7 15:06:20 CST 2015 ...make[2]: Leaving directory `/root/openjdk6/jdk/make'make[1]: Leaving directory `/root/openjdk6'Control linux amd64 1.6.0-internal build_product_image build finished: 15-09-07 15:06Control linux amd64 1.6.0-internal all_product_build build finished: 15-09-07 15:06Control linux amd64 1.6.0-internal all build finished: 15-09-07 15:06[root@dev-52 openjdk6]# echo $?0# 退出码为0说明程序正常退出, 编译成功进入输出目录的j2sdk-image下, 即可看到编译好的JDK了[root@dev-52 openjdk6]# cd build/j2sdk-image/bin[root@dev-52 j2sdk-image]# lsASSEMBLY_EXCEPTION  bin  demo  include  jre  lib  LICENSE  man  sample  src.zip  THIRD_PARTY_README[root@dev-52 bin]# ./java -versionopenjdk version "1.6.0-internal"OpenJDK Runtime Environment (build 1.6.0-internal-root_07_sep_2015_14_49-b00)OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

到此整个编译过程就结束了, 当然第一次编译肯定不会这么顺利的完成, 操作时需要细心, 当然编译OpenJDK7也是大同小异, 在debain平台下依赖包的名字可能会有差异, 这需要注意一下.
OK, 对JVM感兴趣的同学赶紧亲自动手试一下吧.

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参考资料

• 《深入理解Java虚拟机:JVM高级特性与最佳实践》 作者: 周志明
• http://blog.csdn.net/bysun2013/article/details/41984335
• http://openjdk.java.net/