RFR: 8339480: Build static-jdk image with a statically linked launcher [v8]

[Magnus Ihse Bursie]

On Tue, 29 Oct 2024 20:43:16 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> As a prerequisite for Hermetic Java, we need a statically linked `java` launcher. It should behave like the normal, dynamically linked `java` launcher, except that all JDK native libraries should be statically, not dynamically, linked.
>> 
>> This patch is the first step towards this goal. It will generate a `static-jdk` image with a statically linked launcher. This launcher is missing several native libs, however, and does therefore not behave like a proper dynamic java. One of the reasons for this is that local symbol hiding in static libraries are not implemented yet, which causes symbol clashes when linking all static libraries together. This will be addressed in an upcoming patch. 
>> 
>> All changes in the `src` directory are copied from, or inspired by, changes made in [the hermetic-java-runtime branch in Project Leyden](https://github.com/openjdk/leyden/tree/hermetic-java-runtime).
>
> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix bug in filtering out -Wl,--exclude-libs,ALL

I finally noticed that you are testing a precompiled HelloWorld class, and I have been running with a source file argument to have java compile it on the fly.

When I try using a pre-compiled HelloWorld, the linux port works for me too.

@jianglizhou Can you please verify if you can run this with a .java file directly? To be clear: this works fine on my mac with this PR, and (as I said), I'm pretty certain it used to work at least at some point during development on this PR.


ihse at sthihse:/localhome/git/jdk-ALT$ cat > HelloWorld.java
public class HelloWorld {
  public static void main(String[] args) {
    System.out.println("Hello, world!");
  }
}
ihse at sthihse:/localhome/git/jdk-ALT$ javac HelloWorld.java 
ihse at sthihse:/localhome/git/jdk-ALT$ ./build/linux-x64/images/static-jdk/bin/java HelloWorld 
Hello, world!
ihse at sthihse:/localhome/git/jdk-ALT$ ./build/linux-x64/images/static-jdk/bin/java HelloWorld.java
Error: Unable to load main class com.sun.tools.javac.launcher.SourceLauncher in module jdk.compiler
Caused by: java.lang.UnsatisfiedLinkError: no jimage in system library path: /localhome/git/jdk-ALT/build/linux-x64/images/static-jdk/bin
Runtime.exit(1) logging failed: Could not initialize class jdk.internal.module.SystemModuleFinders$SystemImage
ihse at sthihse:/localhome/git/jdk-ALT$

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PR Comment: https://git.openjdk.org/jdk/pull/20837#issuecomment-2452139764