RFR: 8288048: Build failure with GCC 6 after JDK-8286562

[Aleksey Shipilev]

On Wed, 8 Jun 2022 17:52:42 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> [JDK-8286562](https://bugs.openjdk.org/browse/JDK-8286562) added the `-Wstringop-overflow` pragma, which cannot be understood by GCC 6. There are already ways to make such pragmas conditional on GCC version.
> 
> Additional testing:
>  - [x] Linux x86_64 `fastdebug` build with GCC 6
>  - [x] Linux x86_64 `fastdebug` build with GCC 9
> 
> @YaSuenag, if you could test with GCC 12, that would be helpful.

Thanks! I am integrating to unbreak JDK 19 on GCC 6 before RDP1 hits.

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PR: https://git.openjdk.org/jdk/pull/9090