RFR: 8353009: Document target selection flag for Windows AArch64 builds

[Saint Wesonga]

On Thu, 27 Mar 2025 11:37:29 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> Thanks for documenting it ! My colleague used instead '--build=aarch64-pc-cygwin' , is this equivalent ?

I don't think `--build=aarch64-pc-cygwin` is equivalent to `--openjdk-target=aarch64-unknown-cygwin`. The build experts can clarify this but my understanding is that `--openjdk-target` automatically sets the --host and --target options for cross compilation, which I (mistakenly) thought was your scenario. The `--build` option you are using will give you a native build, which is your goal. I filed https://bugs.openjdk.org/browse/JDK-8353066 per your suggestion that it would be good to automatically select the native build instead of requiring a flag for that.

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PR Comment: https://git.openjdk.org/jdk/pull/24267#issuecomment-2759060937