Compile OpenJDK7 in Ubuntu11.10

1. first go to the terminal (sudoapt-getinstallaptitude) sudoaptitudebuild-depopenjdk-63. Note: Ubuntu system language is required 1. first go to the http://download.java.net/openjdk/jdk7/ to download the OpenJDK7 source code zip package
 
2. Install the compilation Toolkit
If notAptitude, first installAptitude(Sudo apt-get install aptitude)
Sudo aptitude build-dep openjdk-6

3. Note:: Ubuntu SystemLanguageRequiredSwitchToEnglish(SystemSet->LanguageSupported)
4. Modify the Makefile file in hotspot/make/linux and comment out the following content. If no comment is made, an error is returned, and exit 1 to exit Compilation:

1. Check_ OS _version:
2. # Ifeq ($ (DISABLE_HOTSPOT_ OS _VERSION_CHECK) $ (EMPTY_IF_NOT_SUPPORTED ),)
3. # $ (QUIETLY)> & 2 echo "*** This OS is not supported:" 'uname-a'; exit 1;
4. # Endif

5. Modify jdk/make/javax/sound/jsoundalsa/ Makefile file under

LDFLAGS += -lasound

Change
EXTRA_LIBS + =-lasound
Otherwise, the compilation fails.

6. Prepare the compilation Script: buildjdk. sh and place it in the root directory of openjdk source code.

1. #! /Bin/bash
4. Export LANG = C
5. Export ALT_BOOTDIR =/usr/lib/jvm/java-6-openjdk
6. Export ALLOW_DOWNLOADS = true
7. Export USE_PRECOMPILED_HEADER = true
8. Export SKIP_DEBUG_BUILD = false
9. Export SKIP_FASTDEBUG_BUILD = true
10. Export DEBUG_NAME = debug
11. Unset CLASSPATH
12. Unset JAVA_HOME
14. Make sanity & make

7. Execute the compilation script./buildjdk. sh
8. Check the result after compilation is completed.

1. -- Build times ----------
2. Target debug_build
3. Start 2012-02-24 21:44:33
4. End 22:40:32
5. 00:00:52 corba
6. 00:23:09 hotspot
7. 00:09:25 jaxp
8. 00:08:38 jaxws
9. 00:13:01 jdk
10. 00:00:54 langtools
11. 00:55:59 TOTAL
12. -------------------------
13. Make [1]: Leaving directory '/home/nathan/study/openjdk'
14. Nathan @ ubuntu :~ /Study/openjdk $ build/linux-i586-debug/j2sdk-image/bin/java-version
15. Openjdk version "1.7.0-internal-debug"
16. OpenJDK Runtime Environment (build 1.7.0-internal-debug-nathan_2012_02_24_20_17-b00)
17. OpenJDK Server VM (build 21.0-b17-jvmg, mixed mode)