RFR: 8321688: Build on linux with GCC 7.5.0 fails after 8319577 [v2]

[Sandhya Viswanathan]

On Tue, 19 Dec 2023 02:22:05 GMT, Guoxiong Li <gli at openjdk.org> wrote:

>> Guoxiong Li has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
>> 
>>  - Bump the needed version of GCC.
>>  - Revert previous change.
>>  - Merge branch 'master' into JDK-8321688
>>  - JDK-8321688
>
>> Have you tested with gcc 9? Or is this just supposition based on gcc9 having removed the experimental
> status for C++17?
> 
> I have not tested GCC 8 and 9. @sviswa7 seems to test them.
> 
>> I have verified that with the above change the builds (release, fastdebug, slowdebug) all succeed with GCC 8.4.0 as well as prior GCC like GCC7.5.0 and the test/jdk/java/util/Arrays/Sorting.java passes successfully with these builds.
> 
> Thanks for your tests. But from the description of the [GCC document](https://gcc.gnu.org/projects/cxx-status.html), shown below, it may be good to skip GCC 8 and use GCC 9 directly if we want to switch to C++17.
> 
>>  Some C++17 features are available since GCC 5, but support was experimental and the ABI of C++17 features was not stable until GCC 9.
> 
> What do you think about it?

@lgxbslgx  We would like to keep GCC 8.4.0 as the minimum.

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PR Comment: https://git.openjdk.org/jdk/pull/17047#issuecomment-1863127078