RFR: 8357979: Compile jdk.internal.vm.ci targeting the Boot JDK version

[Erik Joelsson]

On Tue, 1 Jul 2025 14:11:32 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> From the bug description:
> 
> There are plans to build libgraal in JDK master using a version of Native Image running on a JDK one version behind JDK master. This Native Image execution needs to be able to load the JVMCI classes as they are built into the libgraal image. As such, the JVMCI classes must have a class file major version of N-1 where N is the major class file version of JDK master. 
> 
> This PR is basically the same change as published by Doug in https://github.com/openjdk/jdk/pull/25494, but it contains some cleanup and adds and uses the `TARGET_RELEASE` argument that Doug correctly realized was needed.

make/common/JavaCompilation.gmk line 42:

> 40: # Create classes that can run on the bootjdk
> 41: # -Xlint:-options is added to avoid "warning: [options] system modules path not set in conjunction with -source"
> 42: TARGET_RELEASE_BOOTJDK := -source $(OLDEST_BOOT_JDK_VERSION) -target $(OLDEST_BOOT_JDK_VERSION) -Xlint:-options

Line length?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26069#discussion_r2266708444