RFR: 8256718: Obsolete the long term deprecated and aliased Trace flags [v2]

[David Holmes]

On Tue, 1 Dec 2020 21:44:09 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

>> Please review this change to obsolete the deprecated and aliased Trace flags.  The now empty aliased_logging_flags support was left in arguments.cpp for use by trace flags that get deprecated and aliased in the future.
>> 
>> With this change, users will get the following example messages when using these obsolete flags, depending on whether -XX:+... or -XX:-... was specified:
>> 
>> VM warning: Ignoring option TraceClassPaths; support was removed in 16.0.  Please use -Xlog:class+path=info instead.
>> 
>> VM warning: Ignoring option TraceClassPaths; support was removed in 16.0.  Please use -Xlog:class+path=off instead.
>> 
>> The change was tested with tiers1and 2 on Linux, Windows, and MacOS, and tiers 3-5 on Linux x64 and with JCK lang and vm tests.
>> 
>> Thanks, Harold
>
> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8256718: Obsolete the long term deprecated and aliased Trace flags

I'm still pushing for treating all flags the same and removing all the aliased-flag code.

Coleen seems to be okay either way. :)

Thanks,
David

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Changes requested by dholmes (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1525