在Linux上編譯OpenJDK7源碼 | Compile OpenJDK7 source code on CentOS 6.5

 # 軟件環境丨Software Environment

• OS：CentOS 6.5
• JDK: OpenJDK-7u40 

 # 準備工做丨Preparation

1. 下載源碼包 | Download source code package 
   OpenJDK Source Releases

2. 解壓源碼包 | Decompress the package

   # unzip openjdk-7u40-fcs-src-b43-26_aug_2013.zip

   • hotspot 虛擬機實現，大部分是C/C++代碼
   • jdk Java核心類庫目錄，位於 jdk/src/share/classes
   • langtools 一些編譯工具

   安裝依賴 | Install dependence

   # yum -y install gcc gcc-c++ alsa-lib alsa-lib-devel libXrender libXrender-devel libXi-devel libXt-devel libXtst-devel cups cups-devel

3. 安裝freetype | install freetype

4. # ./configure && make && make install

5. 安裝ant | install ant

6. # ln -s /usr/local/apache-ant-1.9.4/bin/ant /usr/bin/ant

7. 安裝JDK（若是已有則沒必要從新安裝） | install JDK(optional if already installed)
   Sun JDK或Open JDK都可，過程略.

 # 環境配置丨Environment Configuration

編輯文件vim ~/.bash_profile加入如下變量 | Modify the .bash_profile and set the variables below

export LANG="C"
export ALT_BOOTDIR="/usr/java/jdk1.7.0_67/"
export ANT_HOME="/usr/local/apache-ant-1.9.4"
export ALT_FREETYPE_HEADERS_PATH="/usr/local/include/freetype2"
export ALT_FREETYPE_LIB_PATH="/usr/local/lib"
export ALLOW_DOWNLOADS=true
export SKIP_DEBUG_BUILD=false
export SKIP_FASTDEBUG_BUILD=true
export DEBUG_NAME=debug
unset JAVA_HOME
unset CLASSPATH

使變量生效 | make the variables take effect

# source ~/.bash_profile

 # 編譯源碼丨Compile Source Code

測試環境是否健全 | Check environment if sane.

# make sanity

若是輸出如下內容則表示經過，能夠進行編譯。| if the environment is OK, it can be compiled.

Sanity check passed.

開始編譯 | start to compile use 'make' command

# make ARCH_DATA_MODEL=64

看到以下輸出則爲編譯成功 | It indicates that OpenJDK has been compiled successfully

>>>Finished making images @ Sat Nov  8 00:45:16 EST 2014 ...
make[2]: Leaving directory `/usr/local/openjdk/jdk/make'
########################################################################
##### Leaving jdk for target(s) sanity all docs images             #####
########################################################################
##### Build time 00:10:15 jdk for target(s) sanity all docs images #####
########################################################################

#-- Build times ----------
Target debug_build
Start 2014-11-08 00:26:41
End   2014-11-08 00:45:16
00:02:11 corba
00:04:36 hotspot
00:00:24 jaxp
00:00:30 jaxws
00:10:15 jdk
00:00:39 langtools
00:18:35 TOTAL
-------------------------
make[1]: Leaving directory `/usr/local/openjdk'
[root@BobServerStation openjdk]#

 # 測試驗證丨Testing & Verification

• 一個測試類Test.java

  /**
  * Author: Bob.Z
  * Date: 2014-11-08
  */
  public class Test{
    public static void main(String[] args){
         System.out.println("Hello OpenJDK~");
    }
  }

  使用剛生成的JDK編譯：

• # ./build/linux-amd64/bin/javac Test.java

  在當前目錄下會生成Test.class文件，而後運行便會看到輸出。

  # ./build/linux-amd64/bin/java Test
  Hello OpenJDK~

• 另外一個測試修改JDK源碼
  進入目錄jdk/src/share/classes/java/io，而後修改PrintStream.java

  /**
     * Prints a string.  If the argument is <code>null</code> then the string
     * <code>"null"</code> is printed.  Otherwise, the string's characters are
     * converted into bytes according to the platform's default character
     * encoding, and these bytes are written in exactly the manner of the
     * <code>{@link #write(int)}</code> method.
     *
     * @param      s   The <code>String</code> to be printed
     */
    public void print(String s) {
        if (s == null) {
            s = "null";
        }
        s = s + " This is OpenJdk7 compiled by Bob.Z!!!";  // 從新賦值
        write(s);
    }

  接下來從新編譯JDK，從新編譯剛纔的Test.java文件並運行會看到以下輸出：

enjoy them:D

 

 # 參考資料丨Reference

• OpenJDK: https://jdk7.java.net/
• freetype: http://download.savannah.gnu.org/releases/freetype/
• Ant: http://archive.apache.org/dist/ant/binaries/

 

-EOF-