編譯hotspot8

編譯hotspot8

gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-36)
gcc我用的188上的4.8,若是用189 機器上的gcc 7 會編譯報錯

cd /root/yuyi/jdk8-b120/jdk-a1ee9743f4ee
chmod +x configure
yum install libXtst-devel libXt-devel libXrender-devel
yum install cups-devel
yum install freetype-devel
yum install alsa-lib-devel
# 沒有javac的話要裝一個  此步驟可選 主要是要javac在
yum install java-1.8.0-openjdk-devel
./configure --with-debug-level=slowdebug

配置成功的話結果以下：

A new configuration has been successfully created in
/root/yuyi/jdk8-b120-a1ee9743f4ee/jdk-a1ee9743f4ee/build/linux-x86_64-normal-server-slowdebug
using configure arguments '--with-debug-level=slowdebug'.

Configuration summary:
* Debug level:    slowdebug
* JDK variant:    normal
* JVM variants:   server
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 64

Tools summary:
* Boot JDK:       openjdk version "1.8.0_212" OpenJDK Runtime Environment (build 1.8.0_212-b04) OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)  (at /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64)
* C Compiler:     gcc (GCC) 4.8.5 20150623 (Red Hat-36) version 4.8.5-36) (at /usr/bin/gcc)
* C++ Compiler:   g++ (GCC) 4.8.5 20150623 (Red Hat-36) version 4.8.5-36) (at /usr/bin/g++)

Build performance summary:
* Cores to use:   10
* Memory limit:   15836 MB
* ccache status:  not installed (consider installing)

Build performance tip: ccache gives a tremendous speedup for C++ recompilations.
You do not have ccache installed. Try installing it.
You might be able to fix this by running 'sudo yum install ccache'.```

開始編譯：

nohup make all &
tail -f nohup.out
# 忽略 exception in thread "main" java.lang.VerifyError: class jdk.nashorn...
[root@ceph2:/root/yuyi/jdk8-b120-a1ee9743f4ee/jdk-a1ee9743f4ee/build/linux-x86_64-normal-server-slowdebug/jdk/bin]
# ./java -version
openjdk version "1.8.0-internal-debug"
OpenJDK Runtime Environment (build 1.8.0-internal-debug-root_2019_06_23_21_36-b00)
OpenJDK 64-Bit Server VM (build 25.0-b62-debug, mixed mode)

解壓調試符號包並調試：

export args='-Xmx50m -XX:+UseSerialGC  -XX:+PrintCommandLineFlags  -verbose:gc -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps  -Xloggc:/root/yuyi/temp/gclog/UseSerialGC.log'

cd /root/yuyi/jdk8-b120-a1ee9743f4ee/jdk-a1ee9743f4ee/build/linux-x86_64-normal-server-slowdebug/jdk/lib/amd64/server

unzip libjvm.diz  
# debug GCTest1： 
cd /root/yuyi/jdk8-b120-a1ee9743f4ee/jdk-a1ee9743f4ee/build/linux-x86_64-normal-server-slowdebug/jdk/bin
gdb --args ./java  $args -cp ./ GCTest1

我後來在我本身虛擬機上也能編譯經過。我本身虛擬機ubuntu desktop18。配合CDT使用，爽的飛起。