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在Ubuntu20下编译OpenJDK8
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编译OpenJDK8
最近看了《深入理解Java虚拟机》这本书，想动手编译自己的JDK，按照书里的说法开始想编译OpenJDK7来着，但是折腾了半天，最后成功了之后测试时一直在提示 Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again，但是执行了提示的命令也不好使，水平有限就不深究了，想着能不能换成8的版本。尝试了一下，在解决完过程的问题之后，竟然成功了，在此记录，希望能对同样在折腾的小伙伴有一些帮助。 本文是对自己的操作过程做的记录，经历比较坎坷。 环境准备操作系统还是原来的操作系统，不多说，用的ubuntu 20.04，系统信息如下。 访问 源代码下载地址 下载源代码 wget https://download.java.net/openjdk/jdk8u41/ri/openjdk-8u41-src-b04-14_jan_2020.zip 查看源代码首先，先来查看一下源代码，目录如下： ➜ openjdk ll 总用量 234K -rw-r--r-- 1 zhanggy zhanggy 1.5K 1月 15 2020 ASSEMBLY_EXCEPTION drwxr-xr-x 6 zhanggy zhanggy 6 1月 15 2020 common -rw-r--r-- 1 zhanggy zhanggy 1.3K 1月 15 2020 configure drwxr-xr-x 5 zhanggy zhanggy 11 1月 15 2020 corba -rw-r--r-- 1 zhanggy zhanggy 3.1K 1月 15 2020 get_source.sh drwxr-xr-x 7 zhanggy zhanggy 13 1月 15 2020 hotspot drwxr-xr-x 6 zhanggy zhanggy 15 1月 15 2020 jaxp drwxr-xr-x 6 zhanggy zhanggy 15 1月 15 2020 jaxws drwxr-xr-x 6 zhanggy zhanggy 13 1月 15 2020 jdk drwxr-xr-x 6 zhanggy zhanggy 12 1月 15 2020 langtools -rw-r--r-- 1 zhanggy zhanggy 19K 1月 15 2020 LICENSE drwxr-xr-x 6 zhanggy zhanggy 12 1月 15 2020 make -rw-r--r-- 1 zhanggy zhanggy 6.1K 1月 15 2020 Makefile drwxr-xr-x 12 zhanggy zhanggy 19 1月 15 2020 nashorn -rw-r--r-- 1 zhanggy zhanggy 1.6K 1月 15 2020 README -rw-r--r-- 1 zhanggy zhanggy 127K 1月 15 2020 README-builds.html drwxr-xr-x 2 zhanggy zhanggy 3 1月 15 2020 test -rw-r--r-- 1 zhanggy zhanggy 175K 1月 15 2020 THIRD_PARTY_README 查看系统缺失的依赖OpenJDK 的./configure 自带依赖的检查，可以查看编译的必要依赖是否存在。 # 先将 configure 授执行的权限 chmod u+x ./configure # 执行 configure ➜ openjdk chmod u+x configure ➜ openjdk ./configure Running generated-configure.sh configure: Configuration created at Wed Jan 20 21:47:01 CST 2021. configure: configure script generated at timestamp 1573688723. checking for basename... /usr/bin/basename ... # 省略中间输出 configure: Found potential Boot JDK using well-known locations (in /usr/lib/jvm/java-11-openjdk-amd64) configure: Potential Boot JDK found at /usr/lib/jvm/java-11-openjdk-amd64 did not contain bin/javac; ignoring configure: (This might be an JRE instead of an JDK) configure: Found potential Boot JDK using well-known locations (in /usr/lib/jvm/java-1.11.0-openjdk-amd64) configure: Potential Boot JDK found at /usr/lib/jvm/java-1.11.0-openjdk-amd64 did not contain bin/javac; ignoring configure: (This might be an JRE instead of an JDK) configure: Found potential Boot JDK using well-known locations (in /usr/lib/jvm/default-java) configure: Potential Boot JDK found at /usr/lib/jvm/default-java did not contain bin/javac; ignoring configure: (This might be an JRE instead of an JDK) configure: Could not find a valid Boot JDK. You might be able to fix this by running 'sudo apt-get install openjdk-7-jdk'. configure: This might be fixed by explicitely setting --with-boot-jdk configure: error: Cannot continue configure exiting with result code 1检核结果提示缺少 Boot JDK 因为在当前的源中已经移除了openjdk-7-jdk包，所以无法用建议的命令补全依赖。 此时下载Oracle JDK7作为Boot JDK。至于为什么采用jdk7作为Boot JDK 而不是其他版本，后续再讲。配置 Boot JDK 的环境变量与正常安装JDK的环境变量一般无二通常是配置JAVA_HOME 、PATH 再次检查依赖 ➜ openjdk ./configure Running generated-configure.sh configure: Configuration created at Wed Jan 20 21:56:55 CST 2021. configure: configure script generated at timestamp 1573688723. ... # 省略中间输出 checking for jtreg... no checking for gcc... no checking for cc... no configure: error: Could not find a C compiler. You might be able to fix this by running 'sudo apt-get install build-essential'. configure exiting with result code 1Could not find a C compiler. 没有找到C语言的编译器，按照系统的提示，我们安装一个C编译器sudo apt-get install build-essential，同时也会安装本身所依赖的包，等待安装完成… 三次检查依赖后续还会检查出一堆编译需要的依赖包，根据提示用相同的方式安装依赖包，这里不再赘述， ➜ openjdk sudo apt-get install libx11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev ➜ openjdk sudo apt-get install libcups2-dev ➜ openjdk sudo apt-get install libasound2-dev 又出现一个错误 Build performance tip: ccache gives a tremendous speedup for C++ recompilations. You have ccache installed, but it is a version prior to 3.1.4. Try upgrading. You might be able to fix this by running 'sudo apt-get install ccache'.此错误按照提示并不能修复。本身ccache已经安装了，只不过版本比较高 不过可以禁用，使用如下的配置 ➜ openjdk ./configure --disable-ccache输出下列字样，代表检核通过了 ==================================================== A new configuration has been successfully created in /home/zhanggy/Downloads/openjdk/build/linux-x86_64-normal-server-release using configure arguments '--disable-ccache'. Configuration summary: * Debug level: release * JDK variant: normal * JVM variants: server * OpenJDK target: OS: linux, CPU architecture: x86, address length: 64 Tools summary: * Boot JDK: java version "1.7.0_80" Java(TM) SE Runtime Environment (build 1.7.0_80-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode) (at /home/zhanggy/Downloads/jdk1.7.0_80) * C Compiler: x86_64-linux-gnu-gcc-9 (Ubuntu 9.3.0-17ubuntu1~20.04) version 9.3.0 (at /usr/bin/x86_64-linux-gnu-gcc-9) * C++ Compiler: x86_64-linux-gnu-g++-9 (Ubuntu 9.3.0-17ubuntu1~20.04) version 9.3.0 (at /usr/bin/x86_64-linux-gnu-g++-9) Build performance summary: * Cores to use: 3 * Memory limit: 3848 MB * ccache status: not installed (consider installing) WARNING: The result of this configuration has overridden an older configuration. You *should* run 'make clean' to make sure you get a proper build. Failure to do so might result in strange build problems.此时还有一个警告，不过作为 “devor”，类似于“吸烟有害健康”之类的警告基本上都是忽略… 开始编译 ➜ openjdk make 又报错了 INFO: ZIP_DEBUGINFO_FILES=1 *** This OS is not supported: Linux zgy-ubuntu 5.8.0-38-generic #43~20.04.1-Ubuntu SMP Tue Jan 12 16:39:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux make[5]: *** [/home/zhanggy/Downloads/openjdk/hotspot/make/linux/Makefile:238：check_os_version] 错误 1 make[4]: *** [/home/zhanggy/Downloads/openjdk/hotspot/make/linux/Makefile:259：linux_amd64_compiler2/debug] 错误 2 make[3]: *** [Makefile:231：generic_build2] 错误 2 make[2]: *** [Makefile:177：product] 错误 2 make[1]: *** [HotspotWrapper.gmk:45：/home/zhanggy/Downloads/openjdk/build/linux-x86_64-normal-server-release/hotspot/_hotspot.timestamp] 错误 2 make: *** [/home/zhanggy/Downloads/openjdk//make/Main.gmk:109：hotspot-only] 错误 2根据提示，查看源代码 SUPPORTED_OS_VERSION = 2.4% 2.5% 2.6% 3% OS_VERSION := $(shell uname -r) EMPTY_IF_NOT_SUPPORTED = $(filter $(SUPPORTED_OS_VERSION),$(OS_VERSION)) check_os_version: ifeq ($(DISABLE_HOTSPOT_OS_VERSION_CHECK)$(EMPTY_IF_NOT_SUPPORTED),) $(QUIETLY) >&2 echo "*** This OS is not supported:" `uname -a`; exit 1; endif当前系统的内核 ➜ openjdk uname -r 5.8.0-38-generic将 SUPPORTED_OS_VERSION 添加当前内核的支持 SUPPORTED_OS_VERSION = 2.4% 2.5% 2.6% 3% 4% 5% OS_VERSION := $(shell uname -r) EMPTY_IF_NOT_SUPPORTED = $(filter $(SUPPORTED_OS_VERSION),$(OS_VERSION)) check_os_version: ifeq ($(DISABLE_HOTSPOT_OS_VERSION_CHECK)$(EMPTY_IF_NOT_SUPPORTED),) $(QUIETLY) >&2 echo "*** This OS is not supported:" `uname -a`; exit 1; endif 再次编译…错误太多，不一一展示，多是一些 C++11之类的错误 可以看出来，c++11或者说高版本的c++语法和低版本的c++语法在某此地方不兼容，sudo apt-get install 安装的 gcc 和 g++的版本太高了，与源代码编译所需的版本不同，所以有许多语法上的错误。 处理方式：需要将高版的g++替换为低版的g++ 当前源中有的最低版本的g++和gcc是7的版本，尝试一下。 ➜ Download sudo apt-get install g++-7 ... # 将/usr/bin 下的gcc和g++以及相关的工具都换成 7 的版本，删除原来的软链接，重新创建 ➜ Download cd /usr/bin ➜ bin sudo rm g++ && sudo ln -s g++-7 g++ ➜ bin sudo rm gcc && sudo ln -s gcc-7 gcc ➜ bin sudo rm gcc-ar && sudo ln -s gcc-ar-7 gcc-ar ➜ bin sudo rm gcc-nm && sudo ln -s gcc-nm-7 gcc-nm ➜ bin sudo rm gcc-ranlib && sudo ln -s gcc-ranlib-7 gcc-ranlib ➜ bin sudo rm gcov && sudo ln -s gcov-7 gcov ➜ bin sudo rm gcov-dump && sudo ln -s gcov-dump-7 gcov-dump ➜ bin sudo rm gcov-tool && sudo ln -s gcov-tool-7 gcov-tool重新执行 ➜ openjdk ./configure --disable-ccache ➜ openjdk make依旧报错，还是C++11之类的错误，版本还是太高。 能否换更低的版本？百度网上的资料，大多数编译成功的案例还是用的g++ 4.*的版本，添加一个包含g++ 4.*的源，安装g+±4.9。 ➜ openjdk sudo vim /etc/apt/sources.list # 添加两行数据到最后： # # for gcc 4.* g++ 4.* # deb http://dk.archive.ubuntu.com/ubuntu/ xenial main # deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe ➜ openjdk sudo apt update ➜ openjdk sudo apt-get install g++-4.9 ... # 会自动安装依赖的 gcc-4.9 ➜ openjdk cd /usr/bin ➜ bin sudo rm g++ && sudo ln -s g++-4.9 g++ ➜ bin sudo rm gcc && sudo ln -s gcc-4.9 gcc ➜ bin sudo rm gcc-ar && sudo ln -s gcc-ar-4.9 gcc-ar ➜ bin sudo rm gcc-nm && sudo ln -s gcc-nm-4.9 gcc-nm ➜ bin sudo rm gcc-ranlib && sudo ln -s gcc-ranlib-4.9 gcc-ranlib ➜ bin sudo rm gcov && sudo ln -s gcov-4.9 gcov果然 C++11的错误没有了，还剩下下面的错误： /home/zhanggy/Downloads/openjdk/hotspot/src/os/linux/vm/os_linux.inline.hpp: In static member function ‘static dirent* os::readdir(DIR*, dirent*)’: /home/zhanggy/Downloads/openjdk/hotspot/src/os/linux/vm/os_linux.inline.hpp:127:18: error: ‘int readdir_r(DIR*, dirent*, dirent**)’ is deprecated (declared at /usr/include/dirent.h:183) [-Werror=deprecated-declarations] if((status = ::readdir_r(dirp, dbuf, &p)) != 0) { ^ /home/zhanggy/Downloads/openjdk/hotspot/src/os/linux/vm/os_linux.inline.hpp:127:42: error: ‘int readdir_r(DIR*, dirent*, dirent**)’ is deprecated (declared at /usr/include/dirent.h:183) [-Werror=deprecated-declarations] if((status = ::readdir_r(dirp, dbuf, &p)) != 0) { ^ cc1plus: all warnings being treated as errors make[6]: *** [/home/zhanggy/Downloads/openjdk/hotspot/make/linux/makefiles/vm.make:304：precompiled.hpp.gch] 错误 1 make[5]: *** [/home/zhanggy/Downloads/openjdk/hotspot/make/linux/makefiles/top.make:119：the_vm] 错误 2 make[4]: *** [/home/zhanggy/Downloads/openjdk/hotspot/make/linux/Makefile:293：product] 错误 2 make[3]: *** [Makefile:231：generic_build2] 错误 2 make[2]: *** [Makefile:177：product] 错误 2 make[1]: *** [HotspotWrapper.gmk:45：/home/zhanggy/Downloads/openjdk/build/linux-x86_64-normal-server-release/hotspot/_hotspot.timestamp] 错误 2 make: *** [/home/zhanggy/Downloads/openjdk//make/Main.gmk:109：hotspot-only] 错误 2以自己还在好些年前学习的C++的经验看确实没有看出来哪里有问题，百度搜索得知因为glibc版本大于等于2.24的情况下，方法 readdir_r被弃用了，所以在调用的时候会出现error的提示，本地版本如下，比较高。 ➜ openjdk getconf GNU_LIBC_VERSION glibc 2.31注释该段或修改源代码，再编译就会忽略掉警告，直到编译完成。。 ➜ openjdk vim ./hotspot/make/linux/makefiles/gcc.make # 修改源代码如下： 208 # WARNINGS_ARE_ERRORS = -Werror 209 WARNINGS_ARE_ERRORS = -Wno-all继续编译… 编译成功编译成功后会输出如下的字样。 ... #省略前面一堆日志输出 Creating jdk/jce/unsigned/sunpkcs11.jar Creating jdk/jce/unsigned/sunec.jar Creating jdk/jce/unsigned/sunjce_provider.jar Creating jdk/jce/unsigned/jce.jar Creating jdk/jce/unsigned/policy/unlimited/US_export_policy.jar Creating jdk/jce/unsigned/policy/limited/local_policy.jar Creating jdk/jce/unsigned/policy/unlimited/local_policy.jar ## Finished jdk (build time 00:09:13) ----- Build times ------- Start 2021-01-21 00:51:39 End 2021-01-21 01:31:32 00:01:21 corba 00:27:19 hotspot 00:00:52 jaxp 00:01:08 jaxws 00:09:13 jdk 00:00:00 langtools 00:39:53 TOTAL ------------------------- Finished building OpenJDK for target 'default' 试一下java命令 ➜ bin pwd /home/zhanggy/Downloads/openjdk/build/linux-x86_64-normal-server-release/jdk/bin ➜ bin ./java -version openjdk version "1.8.0-internal" OpenJDK Runtime Environment (build 1.8.0-internal-zhanggy_2021_01_21_00_29-b00) OpenJDK 64-Bit Server VM (build 25.40-b25, mixed mode)至此，历时一天，编译过程耗时40分钟的 OpenJDK8 编译成功。 |
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