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

[Magnus Ihse Bursie]

On Thu, 11 Jan 2024 13:23:45 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> Compile the JDK as C++17, enabling the use of all C++17 language features
>
> Julian Waters has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Require clang 13 in toolchain.m4

Nobody complained about raising gcc to 10, see https://mail.openjdk.org/pipermail/build-dev/2024-January/042802.html.

@TheShermanTanker Can you update this PR so it sets the minimum gcc to 10.0 instead of 9.0?

@shipilev Are you okay with us moving forward with this? If not, I'd like to see an concrete example of where this will create a problem, so we can discuss if the general good for the platform can be dictated by that use case.

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1923553875