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

[Andrew Haley]

On Fri, 16 Feb 2024 12:43:29 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> I think Kim's approach here -- to separate compiler upgrades from C++17 usage -- is the right way. Then we can discuss each part separately -- what version is suitable for each compiler, and then -- if or when we end up with all compilers supporting C++17 -- we can come back to the discussion of whether that is a good idea.

I agree with all that. I don't even object to upgrading to a recent(ish) GCC, but I do think we ought to at least get a mention of the downsides on the record, and sometimes that job falls to me. So I think I agree it's the right thing to do going forward, even though it might be a bit bumpy for those of us trying to build the JDK on a range of elderly long-term-support Linux systems.

> I also apologize for my hash expressions. :( I did not mean to insult anyone.

No problem. We're good.

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1948879029