Build JDK

jdk.md

• Building the JDK

git clone https://github.com/openjdk/jdk.git

sudo apt install openjdk-21-jdk-headless

java -version

openjdk version "21"

export CC=gcc
export CXX=g++

sudo apt install libcups2-dev

bash configure

====================================================
A new configuration has been successfully created in
github/openjdk/jdk/build/linux-x86_64-server-release
using default settings.

Configuration summary:
* Name:           linux-x86_64-server-release
* Debug level:    release
* HS debug level: product
* JVM variants:   server
* JVM features:   server: 'cds compiler1 compiler2 epsilongc g1gc jfr jni-check jvmci jvmti management parallelgc serialgc services shenandoahgc vm-structs zgc' 
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 64
* Version string: 23-internal-adhoc.user.jdk (23-internal)
* Source date:    1704980810 (2024-01-11T13:46:50Z)

Build performance summary:
* Build jobs:     12
* Memory limit:   64216 MB

make hotspot

Building target 'hotspot' in configuration 'linux-x86_64-server-release'
Compiling up to 1 files for BUILD_TOOLS_HOTSPOT
Creating hotspot/variant-server/tools/adlc/adlc from 13 file(s)
Compiling up to 2 files for BUILD_JVMTI_TOOLS
Creating support/modules_libs/java.base/server/libjvm.so from 1244 file(s)
Finished building target 'hotspot' in configuration 'linux-x86_64-server-release'

bash configure --with-toolchain-type=clang

bear -- make hotspot

https://github.com/openjdk/jdk/blob/9fd855ed477bb0849ce5c774854844deec0f4c6b/src/java.base/share/native/libjli/java.c#L224-L239

https://github.com/openjdk/jdk/blob/9fd855ed477bb0849ce5c774854844deec0f4c6b/src/java.base/unix/native/libjli/java_md.c#L712-L719

https://github.com/openjdk/jdk/blob/9fd855ed477bb0849ce5c774854844deec0f4c6b/src/java.base/share/native/libjli/java.c#L2343-L2381

https://github.com/openjdk/jdk/blob/master/src/java.base/share/native/launcher/main.c

https://github.com/openjdk/jdk/blob/9fd855ed477bb0849ce5c774854844deec0f4c6b/src/java.base/share/native/launcher/main.c#L166-L174

https://github.com/openjdk/jdk/blob/9fd855ed477bb0849ce5c774854844deec0f4c6b/src/java.base/share/native/libjli/java.c#L469-L471

https://github.com/openjdk/jdk/blob/9fd855ed477bb0849ce5c774854844deec0f4c6b/src/java.base/share/native/libjli/java.c#L623-L628