RFR: 8314488: Compile the JDK as C++17

[Thomas Stuefe]

On Mon, 24 Jul 2023 01:41:16 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> Implementation of [JEP draft: Compile the JDK as C++17](https://bugs.openjdk.org/browse/JDK-8310260)

I disagree with this change. This should be discussed more broadly before trying to get a PR in. The associated JEP has been closed by Mark. Just a "oh well, then I'm doing it without JEP" is not the right way.

Before agreeing to this, I would like to know what actual changes have been planned, and see them weighted against the cost. The cost, as I have stated before, are reviewer churn, implementation risk, and increased cost of downporting patches to older JDK versions.

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1681660826