RFR: JDK-8298448: UndefinedBehaviorSanitizer [v2]

[David Holmes]

On Mon, 12 Dec 2022 05:59:19 GMT, Justin King <jcking at openjdk.org> wrote:

>> Allow building OpenJDK with UBSan. Currently the build fails when optimizing the image due to lots of undefined behavior (it invokes the built JVM). Follow up PRs will either replace the undefined behavior with well defined behavior or suppress errors which are intentional. The goal is to make OpenJDK more well defined and thus more portable across compilers and architectures.
>
> Justin King has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove UBSAN_ENABLED From spec.gmk.in

src/java.base/share/native/launcher/main.c line 38:

> 36: 
> 37: #ifdef UNDEFINED_BEHAVIOR_SANITIZER
> 38: // Override weak symbol exposed by UBSan to override default options. This is called by UBSan

Please explain why we need to override the default options.

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PR: https://git.openjdk.org/jdk/pull/11604