RFR: 8325878: Require minimum Clang version 13

[Kim Barrett]

On Thu, 15 Feb 2024 05:19:45 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change that updates the minimum supported version of Clang
> to be used for building OpenJDK from 3.5 to 13.
> 
> This permits enabling C++17 (JDK-8314488), though Clang 5 might suffice for
> that. A minimum of Clang 13 also obtains a critical bug fix for the [[noreturn]]
> attribute (see JDK-8303805).
> 
> Testing: mach5 tier1, which includes building with a recent version of Xcode/clang.

There was some discussion of clang versions over in the PR proposing to enable
C++17 (https://github.com/openjdk/jdk/pull/14988).  The minimum version
proposed here (13) seemed acceptable from that discussion.  Good to go here?

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PR Comment: https://git.openjdk.org/jdk/pull/17862#issuecomment-1968065624