Hermetic Java and static link

[Jiangli Zhou]

CC'ing leyden-dev at openjdk.org

Hi Ioi,

For the current state of  JDK static linking support, the
https://github.com/openjdk/leyden/tree/hermetic-java-runtime is about
the same as the JDK mainline. Most of the JDK libraries and libjvm are
statically linked with the launcher. Please see additional comments
below.

On Tue, Oct 14, 2025 at 10:04 AM <ioi.lam at oracle.com> wrote:
>
> Hi Jiangli,
>
> I tried building with
> https://github.com/openjdk/leyden/tree/hermetic-java-runtime to see if I
> can get a completely statically linked JVM, but the JVM is still
> dynamically linked to a few shared libraries.

Could you please elaborate on the specific libraries that you are
looking into static linking as well? Such as libm, libasound, X11, ,
etc? What are the specific benefits for statically linking with those?

Do you have some context or details on what you are looking for?

>
> Is it possible to do a static link (with "gcc-static ...")?

If I understand the question correctly, -static-libgcc is the default
when building JDK on Linux. See
https://github.com/openjdk/jdk/blob/3d95c83b14cf9a6f683776053e57c07b1847cc17/make/autoconf/lib-std.m4#L50.
It's the case with linking the libjvm.so as well. E.g.:

  g++ ... -static-libgcc -shared ... -Wl,-soname=libjvm.so -o
support/modules_libs/java.base/server/libjvm.so ... -lm -ldl -lpthread
-lrt -static-libstdc++


Thanks,
Jiangli

>
> Thanks
>
> - Ioi
>
> $ bash configure
> $ cd build/linux-x64
> $ make static-jdk-bundles
> $ ls -l build/linux-x64/images/static-jdk/bin/java
> -rwxr-xr-x. 1 opc opc 34915696 Oct 14 08:55
> build/linux-x64/images/static-jdk/bin/java
> $ ldd images/static-jdk/bin/java
>      linux-vdso.so.1 (0x000075aad82ca000)
>      libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x000075aad64c3000)
>      libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x000075aad829e000)
>      libXi.so.6 => /lib/x86_64-linux-gnu/libXi.so.6 (0x000075aad828b000)
>      libXrender.so.1 => /lib/x86_64-linux-gnu/libXrender.so.1
> (0x000075aad827f000)
>      libXtst.so.6 => /lib/x86_64-linux-gnu/libXtst.so.6 (0x000075aad8277000)
>      libasound.so.2 => /lib/x86_64-linux-gnu/libasound.so.2
> (0x000075aad63b9000)
>      libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x000075aad8270000)
>      libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6
> (0x000075aad62ed000)
>      libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
> (0x000075aad826b000)
>      librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x000075aad8266000)
>      libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x000075aad824a000)
>      libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x000075aad6204000)
>      libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x000075aad5e00000)
>      /lib64/ld-linux-x86-64.so.2 (0x000075aad82cc000)
>      libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x000075aad61db000)
>      libbz2.so.1.0 => /lib/x86_64-linux-gnu/libbz2.so.1.0
> (0x000075aad8234000)
>      libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16
> (0x000075aad61a3000)
>      libbrotlidec.so.1 => /lib/x86_64-linux-gnu/libbrotlidec.so.1
> (0x000075aad6195000)
>      libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x000075aad822c000)
>      libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6
> (0x000075aad618d000)
>      libbrotlicommon.so.1 => /lib/x86_64-linux-gnu/libbrotlicommon.so.1
> (0x000075aad616a000)
>      libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x000075aad6154000)
>      libmd.so.0 => /lib/x86_64-linux-gnu/libmd.so.0 (0x000075aad6145000)
>