本身動手編譯OpenJDK

時間  2019-11-29
標籤 本身 動手 編譯 openjdk 欄目 Java 简体版
原文   原文鏈接

我的技術博客：www.zhenganwen.topjava

筆者環境

  • 64bit / Windows10 / i5-7200U / 4核心CPU，在虛擬機上的Centos7（能連外網）上編譯OpenJDK7u75

建議使用Ubuntu或者Centos，安裝依賴的地方使用apt-get/yum替換便可（Rhel的yum源使用收商業限制，所以依賴下載不方便，建議使用centos或者debain，或者更換yum爲centos也行，筆者起初在rhel上編譯，踩了很多坑，最後換到centos上才編譯成功。沒辦法，linux是真的菜，不過經過此次採坑也學了很多linux上編譯源碼的套路，本文會穿插着提到）。python

環境準備

OpenJDK源碼

openjdk7u75，主角，下載好用來編譯。linux

Bootstrap JDK

在編譯JDK時不全是使用C/C++，也有用到JAVA的，所以須要一個已編譯好的JDK，官方稱其爲BOOTSTRAP JDK，要求必須是JDK6 Update14以上版本。建議到Oracle官網上下載，筆者下載的是jdk-7u4-linux-x64c++

編譯環境

編譯須要依賴GCC、C++等環境，一鍵下載：git

yum -y install build-essential gawk m4 openjdk6-jdk libasound2-print-dev binutils libmotif3 libmotif-dev ant
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Xcode相關的庫：github

yum install libX*
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檢查編譯環境

將下載好的openjdk源碼和做爲bootstrap jdk的jdk7u4上傳到centos的/usr/local/java下並解壓：docker

[root@pinyoyougou-docker java]# ls
jdk1.7.0_04  jdk-7u4-linux-x64.tar.gz  openjdk  openjdk-7u75-src-b13-18_dec_2014.zip
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上面的openjdk就是openjdk源碼包解壓以後的目錄，記下這個名字，後續操做都是圍繞這個目錄展開的。shell

進入openjdk並檢查編譯環境：bootstrap

[root@pinyoyougou-docker java]# cd openjdk
[root@pinyoyougou-docker java]# make sanity
WARNING: LANG has been set to zh_CN.UTF-8, this can cause build failures.
         Try setting LANG to 'C'.

WARNING: The version of zip being used is older than
       the required version of '2.2'.
       The version of zip found was ''.

ERROR: The Compiler version is undefined.

ERROR: Your CLASSPATH environment variable is set.  This will
       most likely cause the build to fail.  Please unset it
       and start your build again.

ERROR: Your JAVA_HOME environment variable is set.  This will
       most likely cause the build to fail.  Please unset it
       and start your build again.

ERROR: You seem to not have installed ALSA 0.9.1 or higher.
       Please install ALSA (drivers and lib). You can download the
       source distribution from http://www.alsa-project.org or go to
       http://www.freshrpms.net/docs/alsa/ for precompiled RPM packages.

ERROR: FreeType version  2.3.0  or higher is required.
 make[2]: 進入目錄「/usr/local/java/openjdk/jdk/make/tools/freetypecheck」
/bin/mkdir -p /usr/local/java/openjdk/build/linux-amd64/btbins
rm -f /usr/local/java/openjdk/build/linux-amd64/btbins/freetype_versioncheck
make[2]: 離開目錄「/usr/local/java/openjdk/jdk/make/tools/freetypecheck」
Failed to build freetypecheck.

ERROR: You do not have access to valid Cups header files.
       Please check your access to
           /usr/include/cups/cups.h
       and/or check your value of ALT_CUPS_HEADERS_PATH,
       CUPS is frequently pre-installed on many systems,
       or may be downloaded from http://www.cups.org
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上面出現了兩個警告和五個異常，咱們須要逐個解決。（若是你make sanity輸出的是check pass則可跳過此步驟）centos

  1. 設置環境變量LANG=C

    WARNING: LANG has been set to zh_CN.UTF-8, this can cause build failures.
         Try setting LANG to 'C'.
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    解決方法：

    [root@pinyoyougou-docker java]# export LANG=C
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  2. zip版本較低，須要更新

    WARNING: The version of zip being used is older than
       the required version of '2.2'.
       The version of zip found was ''.
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    解決方法：

    yum install zip
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  3. 缺乏編譯依賴

    ERROR: The Compiler version is undefined.
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    解決：

    [root@pinyoyougou-docker openjdk]# yum install gcc gcc-c++
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  4. 取消已有的JDK環境變量

    ERROR: Your CLASSPATH environment variable is set.  This will
       most likely cause the build to fail.  Please unset it
       and start your build again.
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    因爲我以前在這個centos上裝過jdk並在/etc/profile中配置過JAVA_HOME,CLASS_PATH，所以這裏提示建議我暫時取消這兩項設置，不然可能出現未知錯誤。解決：

    [root@pinyoyougou-docker openjdk]# unset JAVA_HOME
[root@pinyoyougou-docker openjdk]# unset CLASS_PATH
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  5. 缺乏聲卡依賴alsa，這個是linux上經常使用的聲音設備的依賴，java.awt須要依賴這個。

    ERROR: You seem to not have installed ALSA 0.9.1 or higher.
       Please install ALSA (drivers and lib). You can download the
       source distribution from http://www.alsa-project.org or go to
       http://www.freshrpms.net/docs/alsa/ for precompiled RPM packages.
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    解決

    [root@pinyoyougou-docker openjdk]# yum search alsa
已加載插件：fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.shu.edu.cn
 * updates: mirrors.aliyun.com
======================================== N/S matched: alsa ========================================
alsa-firmware.noarch : Firmware for several ALSA-supported sound cards
alsa-lib.x86_64 : The Advanced Linux Sound Architecture (ALSA) library
alsa-lib.i686 : The Advanced Linux Sound Architecture (ALSA) library
alsa-lib-devel.i686 : Development files from the ALSA library
alsa-lib-devel.x86_64 : Development files from the ALSA library
alsa-plugins-arcamav.i686 : Arcam AV amplifier plugin for ALSA
alsa-plugins-arcamav.x86_64 : Arcam AV amplifier plugin for ALSA
alsa-plugins-maemo.i686 : Maemo plugin for ALSA
alsa-plugins-maemo.x86_64 : Maemo plugin for ALSA
alsa-plugins-oss.i686 : Oss PCM output plugin for ALSA
alsa-plugins-oss.x86_64 : Oss PCM output plugin for ALSA
alsa-plugins-pulseaudio.i686 : Alsa to PulseAudio backend
alsa-plugins-pulseaudio.x86_64 : Alsa to PulseAudio backend
alsa-plugins-samplerate.i686 : External rate converter plugin for ALSA
alsa-plugins-samplerate.x86_64 : External rate converter plugin for ALSA
alsa-plugins-upmix.i686 : Upmixer channel expander plugin for ALSA
alsa-plugins-upmix.x86_64 : Upmixer channel expander plugin for ALSA
alsa-plugins-usbstream.i686 : USB stream plugin for ALSA
alsa-plugins-usbstream.x86_64 : USB stream plugin for ALSA
alsa-plugins-vdownmix.i686 : Downmixer to stereo plugin for ALSA
alsa-plugins-vdownmix.x86_64 : Downmixer to stereo plugin for ALSA
alsa-tools.x86_64 : Specialist tools for ALSA
alsa-tools-firmware.x86_64 : ALSA tools for uploading firmware to some soundcards
alsa-utils.x86_64 : Advanced Linux Sound Architecture (ALSA) utilities
alsa-plugins-speex.i686 : Rate Converter Plugin Using Speex Resampler
alsa-plugins-speex.x86_64 : Rate Converter Plugin Using Speex Resampler
[root@pinyoyougou-docker openjdk]# yum -y install alsa-lib* alsa-util*
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    套路一：當提示缺乏依賴，而你不知道要yum install什麼時，你能夠根據提示關鍵字搜一下yum search，而後在搜出的結果列表中，對有着相同前綴的依賴使用後綴通配符一鍵下載。

  6. 缺乏freetype依賴

    ERROR: FreeType version  2.3.0  or higher is required.
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    解決：

    root@pinyoyougou-docker openjdk]# yum search freetype
已加載插件：fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.shu.edu.cn
 * updates: mirrors.aliyun.com
====================================== N/S matched: freetype ======================================
freetype-demos.x86_64 : A collection of FreeType demos
freetype-devel.i686 : FreeType development libraries and header files
freetype-devel.x86_64 : FreeType development libraries and header files
freetype.x86_64 : A free and portable font rendering engine
freetype.i686 : A free and portable font rendering engine

  名稱和簡介匹配 only，使用「search all」試試。
[root@pinyoyougou-docker openjdk]# yum install freetype-devel.x86_64
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    套路二：使用yum install時習慣性帶上一個-y，省得老是詢問是否肯定安裝。

  7. 因而我再make sanity，發現還有一個問題

    ERROR: You do not have access to valid Cups header files.
       Please check your access to
           /usr/include/cups/cups.h
       and/or check your value of ALT_CUPS_HEADERS_PATH,
       CUPS is frequently pre-installed on many systems,
       or may be downloaded from http://www.cups.org
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    缺乏cups打印框架，解決：

    [root@pinyoyougou-docker openjdk]# yum search cups
已加載插件：fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.shu.edu.cn
 * updates: mirrors.aliyun.com
======================================== N/S matched: cups ========================================
bluez-cups.x86_64 : CUPS printer backend for Bluetooth printers
cups.x86_64 : CUPS printing system
cups-client.x86_64 : CUPS printing system - client programs
cups-devel.i686 : CUPS printing system - development environment
cups-devel.x86_64 : CUPS printing system - development environment
cups-filesystem.noarch : CUPS printing system - directory layout
cups-filters.x86_64 : OpenPrinting CUPS filters and backends
cups-filters-devel.i686 : OpenPrinting CUPS filters and backends - development environment
cups-filters-devel.x86_64 : OpenPrinting CUPS filters and backends - development environment
cups-filters-libs.i686 : OpenPrinting CUPS filters and backends - cupsfilters and fontembed
                       : libraries
cups-filters-libs.x86_64 : OpenPrinting CUPS filters and backends - cupsfilters and fontembed
                         : libraries
cups-ipptool.x86_64 : CUPS printing system - tool for performing IPP requests
cups-libs.x86_64 : CUPS printing system - libraries
cups-libs.i686 : CUPS printing system - libraries
cups-lpd.x86_64 : CUPS printing system - lpd emulation
ghostscript-cups.x86_64 : CUPS filter for interpreting PostScript and PDF
gutenprint-cups.x86_64 : CUPS drivers for Canon, Epson, HP and compatible printers
python-cups.x86_64 : Python bindings for CUPS
python-cups-doc.x86_64 : Documentation for python-cups
cups-pk-helper.x86_64 : A helper that makes system-config-printer use PolicyKit
foomatic-filters.x86_64 : CUPS print filters for the foomatic package
samba-krb5-printing.x86_64 : Samba CUPS backend for printing with Kerberos

  名稱和簡介匹配 only，使用「search all」試試。
[root@pinyoyougou-docker openjdk]# yum install cups-devel.x86_64
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  8. make sanity檢查經過：

    Sanity check passed.
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編寫編譯啓動腳本

通過前面一番周折，編譯環境基本上準備好了，接下來就能夠make進行編譯了，可是編譯前須要設置一下一些環境變量，諸如boostrap jdk的根目錄在哪，哪些須要編譯，並行編譯線程數等。

在openjdk/下建立compile.sh並鍵入下列內容（參考《深刻理解Java虛擬機》）：

#語言選項，這個必須設置，不然編譯好後會出現一個HashTable的NPE錯
export LANG=C
 #Bootstrap JDK的安裝路徑。必須設置。 
export ALT_BOOTDIR=/usr/local/java/jdk1.7.0_04
 #容許自動下載依賴
export ALLOW_DOWNLOADS=true
 #並行編譯的線程數，設置爲和CPU內核數量一致便可
export HOTSPOT_BUILD_JOBS=4
export ALT_PARALLEL_COMPILE_JOBS=4
 #比較本次build出來的映像與先前版本的差別。這個對咱們來講沒有意義，必須設置爲false，不然sanity檢查會報缺乏先前版本JDK的映像。若是有設置dev或者DEV_ONLY=true的話這個不顯式設置也行。 
export SKIP_COMPARE_IMAGES=true
 #使用預編譯頭文件，不加這個編譯會更慢一些
export USE_PRECOMPILED_HEADER=true
 #要編譯的內容
export BUILD_LANGTOOLS=true 
#export BUILD_JAXP=false
#export BUILD_JAXWS=false 
#export BUILD_CORBA=false
export BUILD_HOTSPOT=true 
export BUILD_JDK=true
 #要編譯的版本
#export SKIP_DEBUG_BUILD=false
#export SKIP_FASTDEBUG_BUILD=true
#export DEBUG_NAME=debug
 #把它設置爲false能夠避開javaws和瀏覽器Java插件之類的部分的build。 
BUILD_DEPLOY=false
 #把它設置爲false就不會build出安裝包。由於安裝包裏有些奇怪的依賴，但即使不build出它也已經能獲得完整的JDK映像，因此仍是別build它好了。
BUILD_INSTALL=false
 #這兩個環境變量必須去掉，否則會有很詭異的事情發生（我沒有具體查過這些「」詭異的事情」，Makefile腳本檢查到有這2個變量就會提示警告「）
unset JAVA_HOME
unset CLASSPATH

make 2>&1 | tee $ALT_OUTPUTDIR/build.log
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其中須要注意的地方：

  1. 必須設置LANG=C、將ALT_BOOTDIR設置成boostrap jdk的根目錄
  2. 若是你的系統先前配置過jdk環境變量，必定要在這裏unset一下（上述的第40,41行）
  3. 上述並型線程數跟你的cpu核心個數相同便可

其它的地方能夠照搬。

開始編譯

使用上面寫好的編譯啓動腳本開始編譯：

[root@pinyoyougou-docker openjdk]# chmod +x compile.sh
[root@pinyoyougou-docker openjdk]# ./compile.sh
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這個過程一般須要幾十分鐘，若是一切順利，最後會顯示編譯開始時間以及終止時間。（固然，大部分狀況下，受挫之路至關曲折~）。

########################################################################
##### Leaving jdk for target(s) sanity all docs images #####
########################################################################
##### Build time 00:10:12 jdk for target(s) sanity all docs images #####
########################################################################
 #-- Build times ----------
Target all_product_build
Start 2019-01-23 16:37:02
End   2019-01-23 16:48:00
00:00:23 corba
00:00:09 hotspot
00:00:03 jaxp
00:00:06 jaxws
00:10:12 jdk
00:00:03 langtools
00:10:58 TOTAL
-------------------------
make[1]: Leaving directory `/usr/local/java/openjdk'
[root@pinyoyougou-docker openjdk]#
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因此下面將羅列筆者的受挫之路……若是make過程當中發生error異常終止，通常解決異常以後繼續make。筆者開始傻到每次解決異常，而後make clean，再make。

解決編譯錯誤

  1. cannot find -lstdc++

    -l表示庫，cannot find -lXXX，一般表示缺乏libXXX庫。看網上說是缺乏libstdc++-static，但筆者建議最好將yum search libstdc*的搜索結果一股腦全yum install下來，反正又很少。

  2. libjvm.so軟鏈接死循環

    /usr/bin/ld: cannot open output file libjvm.so: Too many levels of symbolic links
collect2: error: ld returned 1 exit status
ln: failed to access 'libjvm.so': Too many levels of symbolic links
ln: failed to access 'libjvm.so.1': Too many levels of symbolic links
/usr/bin/objcopy --only-keep-debug libjvm.so libjvm.debuginfo
/usr/bin/objcopy: Warning: could not locate 'libjvm.so'.  reason: Too many levels of symbolic links
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    這時不能須要先make clean，而後再make sanity、make

  3. 超過十年問題

    Error: time is more than 10 years from present: 1136059200000
java.lang.RuntimeException: time is more than 10 years from present: 1136059200000
        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)
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    修改openjdk//jdk/src/share/classes/java/util/CurrencyData.properties，將其中表示年份的地方都改成距離今年不超過10年的年份：

    • 修改108行 AZ=AZM;2015-12-31-20-00-00;AZN
    • 修改381行 MZ=MZM;2015-06-30-22-00-00;MZN
    • 修改443行 RO=ROL;2015-06-30-21-00-00;RON
    • 修改535行 TR=TRL;2015-12-31-22-00-00;TRY
    • 修改561行 VE=VEB;2015-01-01-04-00-00;VEF

  4. 缺乏C頭文件

    fatal error: X11/Intrinsic.h: No such file or directory
 # include <X11/Intrinsic.h>
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    /usr/include/gnu/stubs.h:7:27: fatal error: gnu/stubs-32.h: No such file or directory compilation terminated. make: *** [bitmap.o] Error 1
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    套路三：若是提示你缺乏xxx/xxx.h，可使用yum provides */xxx.h查看該頭文件包含於哪一個庫中，再將該庫的全名稱做爲yum install的參數下載

本想將筆者踩過的坑都貼出來，奈何編譯輸出信息太多難以找到採坑痕跡。總而言之，不是缺乏依賴，就是已有依賴不兼容（這時你須要32/64位版本都下載）

使用編譯好的jdk

編譯成功以後，openjdk/build/linux-amd64/j2sdk-image就是編譯好的jdk的根目錄：

[root@pinyoyougou-docker j2sdk-image]# bin/java -version
openjdk version "1.7.0-internal"
OpenJDK Runtime Environment (build 1.7.0-internal-root_2019_01_23_14_04-b00)
OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode)
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