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

[Thomas Stuefe]

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

Just on a general note:

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). Because PRs are usually followed only by active developers, but toolchain versions affect a broader part of the community. As we have seen in this PR, there are conflicting interests.

We have things like CSRs and JEPs. Both are not ideal - a JEP is way too massive, and a CSR is about the compatibility of the product, not about build-time. Still, maybe something like a CSR would make sense here.

I understand that with toolchain support, there will always be opposing parties, and I can see arguments on both sides. We don't want to end up like FreeBSD - stuck in time because of opinion stalemates. I just keep thinking that a PR is maybe not the perfect forum for this.

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1946053820