On Tue, 3 Dec 2024 15:26:32 GMT, Alan Bateman <al...@openjdk.org> wrote:

> I'm in two minds as to whether we should do anything here.

So am I. The main motivation is that this no longer works with JEP 493 is 
enabled (no `jmods` dir):


$ bin/jlink --add-modules ALL-MODULE-PATH --output all-mods


Without looking at the implementation, the user doesn't add anything explicit 
via `--module-path` (the impl in fact adds `jmods` folder if it exists). So it 
can be seen as a regression.

> ALL-MODULE-PATH means all observable modules on the module path but here, 
> it's all observable modules minus jdk.jlink or any module that directly 
> requires jdk.jlink. This is hard to reason about.

I'll add here that the reason we need to do this in this patch is because 
`jdk.jlink` isn't being allowed to be part of the link in JEP 493. So in a way, 
when that restriction goes away this restriction can go away too.

I'd be fine with adding a `Warning` that for run-time image links and 
ALL-MODULE-PATH doesn't add `jdk.jlink` or modules depending on `jdk.jlink` to 
the root set. This would be the right thing to do to call out the difference.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/22494#issuecomment-2514934609

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