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

[Andrew Haley]

On Sat, 19 Aug 2023 07:20:15 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> This change needs to be motivated. One way to do that would be to file CRs to change the style guide to permit various features. Label them with `cpp17`. Discuss them prior to making the language change, describing why they are important. A sufficient set of such provides an argument for making the language change.

Is it impractical to drop the obsolete features of C++11, working in the common subset of C++11 and C++17?

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1684883361