[jdk8u-dev] RFR: 8280963: Incorrect PrintFlags formatting on Windows [v2]

[Alex Kasko]

On Fri, 13 May 2022 17:38:41 GMT, Alex Kasko <akasko at openjdk.org> wrote:

>> A fix to 8u-only Windows-specific problem with -XX:+PrintFlags* output.
>> 
>> Problem description on Stack Overflow by Andrei Pangin: https://stackoverflow.com/a/63309395
>> 
>> The problem was fixed in jdk9 as part of [JDK-8042893](https://bugs.openjdk.java.net/browse/JDK-8042893), but this [jdk9 change](https://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/115188e14c15) doesn't look like a good candidate for the 8u backport according to [8u Best Practices](https://mail.openjdk.java.net/pipermail/jdk8u-dev/2020-June/012002.html). Still the problem manifests itself as a customer-visible bug on Windows because people do use -XX:+PrintFlagsFinal to find out the actual flags picked up by JVM and can be confused by unexpected zeros in the output. Proposed patch cherry-picks the minimal change from [JDK-8042893 commit](https://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/115188e14c15#l53.1).
>> 
>> Mailing list review: https://mail.openjdk.java.net/pipermail/jdk8u-dev/2022-February/014532.html
>> 
>> Testing:
>> 
>>  - [x] regression test is included with the proposed patch
>>  - [x] checked that it builds on Windows 64-bit and 32-bit on VS2017 and VS2010
>>  - [x] ran jtreg:hotspot/test/runtime on Windows and Linux
>
> Alex Kasko has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:
> 
>   8280963: Incorrect PrintFlags formatting on Windows

Thanks for the clarification!

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PR: https://git.openjdk.org/jdk8u-dev/pull/45