RFR: 8314488: Compile the JDK as C++17 [v5]

[Martin Doerr]

On Thu, 11 Jan 2024 11:33:07 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Julian Waters has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove unnecessary -std=c++17 option in Lib.gmk
>
> Regarding https://github.com/TheShermanTanker/jdk/actions/runs/7070564987/job/19247370401, could it be that the adlc build didn't get the correct C++ version flags? It doesn't look like a clang 13 specific problem.

> @TheRealMDoerr
> 
> > The only issue I see is requiring clang 14.0 on MacOS is not in sync with "Other JDK 22 build platforms" (https://wiki.openjdk.org/display/Build/Supported+Build+Platforms).
> 
> That page is suppose to document what we actually do, not be a binding contract; so if we change stuff, we update the page to reflect it, rather than the other way around.
> 
> Or maybe I misunderstood your comment?

Correct, but raising requirements requires extra effort to change the build environments, updating docs, etc. (It may even cause incompatibilities. Probably not in this case.) While it may be better to use a newer Xcode on Mac, I can't see sufficient reason for forcing the whole world to build with clang 14.

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PR Comment: https://git.openjdk.org/jdk/pull/14988#issuecomment-1887072454