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docker run -itd -v /home/cheney/expr/jvm/openjdk12/:/opt/ --hostname openjdk.com --name openjdk ubuntu:18.04 /bin/bash

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apt install build-essential
apt install zip unzip
apt install openjdk-11-jdk
apt install libfreetype6-dev libcups2-dev libasound2-dev libffi-dev
apt install libx11-dev libxext-dev libxrender-dev libxrandr-dev libxtst-dev libxt-dev
apt install autoconf
apt install file libfontconfig1-dev

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bash configure \
--with-debug-level=slowdebug \
--with-native-debug-symbols=internal \
--with-jvm-variants=server \
--with-num-cores=4 \
--with-jobs=4 \
--with-log=info

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====================================================
A new configuration has been successfully created in
/opt/openjdk/build/linux-x86_64-server-fastdebug
using configure arguments '--with-debug-level=fastdebug'.

Configuration summary:
* Debug level:    fastdebug
* HS debug level: fastdebug
* JVM variants:   server
* JVM features:   server: 'aot cds cmsgc compiler1 compiler2 epsilongc g1gc graal jfr jni-check jvmci jvmti management nmt parallelgc serialgc services shenandoahgc vm-structs zgc'
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 64
* Version string: 12-internal+0-adhoc..openjdk (12-internal)

Tools summary:
* Boot JDK:       openjdk version "11.0.11" 2021-04-20 OpenJDK Runtime Environment (build 11.0.11+9-Ubuntu-0ubuntu2.18.04) OpenJDK 64-Bit Server VM (build 11.0.11+9-Ubuntu-0ubuntu2.18.04, mixed mode, sharing)  (at /usr/lib/jvm/java-11-openjdk-amd64)
* Toolchain:      gcc (GNU Compiler Collection)
* C Compiler:     Version 7.5.0 (at /usr/bin/gcc)
* C++ Compiler:   Version 7.5.0 (at /usr/bin/g++)

Build performance summary:
* Cores to use:   8
* Memory limit:   11862 MB

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make images

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cat ~/.gdbinit
handle SIGSEGV pass noprint nostop
handle SIGBUS pass noprint nostop

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readelf -wi ./javac.debuginfo | less