[OpenJDK 2D-Dev] RFR: 8246032: Implementation of JEP 347: Adopt C++14 Language Features in HotSpot

[Kim Barrett]

> On Jun 5, 2020, at 7:57 PM, Magnus Ihse Bursie <magnus.ihse.bursie at oracle.com> wrote:
> 
> On 2020-06-05 09:52, Kim Barrett wrote:
>> [Changes are only to the build system, but since the changes have jdk-wide
>> effect I’ve cc’d what I think are the relevant dev lists.]
>> 
>> This change is part of JEP 347; the intent is to target JDK 16.
>> 
>> Please review this change to the building of C++ code in the JDK to
>> enable the use of C++14 language features.  This change does not make
>> any code changes to use new features provided by C++11 or C++14.
>> 
>> This requires trimming the supported compiler versions, moving the
>> minimum supported versions forward (significantly, in some cases).
>> The new minimums are based on compiler documentation rather than
>> testing.  It may be that more recent versions are actually required.
>> 
>> This change needs to be tested on platforms not supported by Oracle.
>> The JEP test plan includes additional Oracle testing beyond what I’ve done.
>> 
>> CR:
>> https://bugs.openjdk.java.net/browse/JDK-8246032
>> 
>> Webrev:
>> https://cr.openjdk.java.net/~kbarrett/8246032/open.02/
> Looks good to me.

Thanks.

> 
> /Magnus
> 
>> 
>> Testing:
>> mach5 tier1-5 on Oracle supported platforms.
>> 
>> Performance testing showed no significant changes in either direction.
>> 
>> Build-only (no tests) for linux-arm32, linux-s390x, linux-ppc64le