RFR: 8242490: Upgrade to gcc 9.2 on Linux

Sat Apr 18 15:54:47 UTC 2020

On Mon, 13 Apr 2020 16:12:38 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> This is a compiler upgrade on Linux from the current gcc 8.3 compiler to gcc 9.2. This will match a recent upgrade done
> for JDK 15 -- see [JDK-8241721](https://bugs.openjdk.java.net/browse/JDK-8241721).
> On a related note, using the gcc 9 compiler produces many (harmless) warnings that will be addressed by
> [JDK-8241476](https://bugs.openjdk.java.net/browse/JDK-8241476) -- see PR #150.
> I have run a full build and test using this new compiler.

Works on my development system (didn't test on our build system yet)

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Marked as reviewed by jvos (Reviewer).

PR: https://git.openjdk.java.net/jfx/pull/178