RFR: 8314488: Compile the JDK as C++17 [v2]

[Kim Barrett]

On Fri, 15 Dec 2023 11:25:24 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> Looks like this change has also already been made, by JDK-8319440.
>> 
>> All of the other non-comment uses of "register" I found in HotSpot are gcc local variable register specifications:
>> https://gcc.gnu.org/onlinedocs/gcc-13.2.0/gcc/Local-Register-Variables.html
>> So are a different thing and not affected by the deprecation/removal of the C++ "register" keyword.
>
> Ah, I was not aware that the asm specifications for explicit registers overrides the warning about the register keyword, thanks!

It's not that it overrides the warning.  They are different syntactic constructs that just happen to have
a word in common.  The joys of parsing C++ ...

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PR Review Comment: https://git.openjdk.org/jdk/pull/14988#discussion_r1427925300