RFR: 8314488: Compile the JDK as C++17 [v6]

[Thomas Stuefe]

On Thu, 15 Feb 2024 15:54:56 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> > I would like it if toolchain version bumps were discussed somewhere else first, not in a PR. (And apologies if it was and I missed that discussion).
> 
> Yes, it definitely was. I posted a separate [mail to build-dev](https://mail.openjdk.org/pipermail/build-dev/2024-January/042802.html) with subject "Raising the minimum version of gcc, clang and xlc". I don't think we can make it more clear than that.

Okay, thank you for that clarification. I clearly missed it then.

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1946396577