RFR: 8246032: Implementation of JEP 347: Adopt C++14 Language Features in HotSpot

[Doerr, Martin]

Hi Kim,

builds out of the box on AIX with IBM XL C/C++ for AIX, V16.1.0 (We already use clang frontend by default.)
Very cool!

Best regards,
Martin


> -----Original Message-----
> From: build-dev <build-dev-bounces at openjdk.java.net> On Behalf Of Kim
> Barrett
> Sent: Freitag, 5. Juni 2020 09:53
> To: build-dev <build-dev at openjdk.java.net>
> Cc: 2d-dev at openjdk.java.net; hotspot-dev developers <hotspot-
> dev at openjdk.java.net>; Java Core Libs <core-libs-dev at openjdk.java.net>
> Subject: RFR: 8246032: Implementation of JEP 347: Adopt C++14 Language
> Features in HotSpot
> 
> [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/
> 
> 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