RFR: 8345627: [REDO] Use gcc12 -ftrivial-auto-var-init=pattern in debug builds

[Magnus Ihse Bursie]

On Wed, 11 Dec 2024 21:14:04 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> This is a retry to add `-ftrivial-auto-var-init=pattern` to gcc debug builds. The first attempt was buggy in multiple ways and had to be backed out.
> 
> This is the description of the original bug report:
> 
> 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.

Keep the pod bay doors open, please bot.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/22691#issuecomment-2587531918