8352612: No way to add back lint categories after "none"

[archiecobbs]

This PR relates to the -Xlint:none flag. Currently, it not only disables all lint categories as one would expect, but it also disables all non-mandatory warnings, period. In other words, -Xlint:none has -nowarn as a hidden side-effect. So for example, trying to do -Xlint:none,serial to enable only the serial lint category is futile: the category will be enabled but the warnings won't ever appear. This PR removes that hidden side-effect, and also clarifies some of the help output.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change requires CSR request JDK-8352901 to be approved

Issues

• JDK-8352612: No way to add back lint categories after "none" (Bug - P4)
• JDK-8352901: No way to add back lint categories after "none" (CSR)

Reviewing

Using git

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$ git fetch https://git.openjdk.org/jdk.git pull/24227/head:pull/24227
$ git checkout pull/24227

Update a local copy of the PR:
$ git checkout pull/24227
$ git pull https://git.openjdk.org/jdk.git pull/24227/head

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$ git pr checkout 24227

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Using Webrev

Link to Webrev Comment

[archiecobbs]

/csr

[bridgekeeper]

👋 Welcome back acobbs! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

@archiecobbs has indicated that a compatibility and specification (CSR) request is needed for this pull request.

@archiecobbs please create a CSR request for issue JDK-8352612 with the correct fix version. This pull request cannot be integrated until the CSR request is approved.

[openjdk]

@archiecobbs The following label will be automatically applied to this pull request:

• compiler

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[mlbridge]

Webrevs

• 02: Full - Incremental (b6beb828)
• 01: Full - Incremental (5fb4ad30)
• 00: Full (8702f04f)