RFR: 8342836: Automatically determine that a test in the docs test root is requested

[Nizar Benalla]

On Tue, 19 Nov 2024 14:23:30 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

> Please review this patch to automatically set `TEST_DEPS` to `docs-jdk` when testing the documentation.
> 
> This comes as a followup to https://github.com/openjdk/jdk/commit/07f550b85a3910edd28d8761e2adfb8d6a1352f6 , as review comments suggested better aways of adding dependencies and to not require users to use a verbose `make test TEST=docs_all TEST_DEPS=docs-jdk`.
> 
> I have verified that `make test-docs_all` does indeed build the docs, `make test TEST=docs_all` does not but the former is clear and short enough to be used.
> 
> TIA.

Thanks, will wait until Magnus can take a look.
One thing I noticed is that I can't set aliases for `test-docs_all` the same way it's done for the test groups above

test-hotspot-gtest: exploded-test-gtest
test-jdk-jtreg-native: test-jdk_native_sanity

I suspect that's because I've already set aliases once in `AddTestDependency`

Trying to use an alias (as in `test-alldocs: test-docs_all`) emits this warning `make: *** No rule to make target 'test-alldocs'. Stop`

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PR Comment: https://git.openjdk.org/jdk/pull/22239#issuecomment-2488082823