RFR: 8287122: Use gcc12 -ftrivial-auto-var-init=pattern in debug builds

[Erik Joelsson]

On Thu, 5 Dec 2024 22:31:11 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> gcc12 has added -ftrivial-auto-var-init=<choice>, which specifies how automatic variables without an initializer should be initialized. The default choice is "uninitialized", which is the default C/C++ behavior. Alternatives are "pattern" and "zero". For improved debugging, helping to detect uninitialized uses, the "pattern" choice should be used.

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/22587#pullrequestreview-2483171209