Clang 19: Two new warnings when linking with full LTO: "stack frame size...", "can't find switch jump table"

[computerix]

See https://bugzilla.kernel.org/show_bug.cgi?id=219686

[nathanchance]

Thanks for the report.

I posted some initial thoughts on the objtool warning on the thread upstream, including a bisect:

https://lore.kernel.org/[email protected]/

I am working on getting a trivial reproducer to report upstream but Josh has sent a patch that should allow objtool to ignore this case as it is not really harmful, just dead code in the binary (as far as I understand it at least):

https://lore.kernel.org/ee25c0b7e80113e950bd1d4c208b671d35774ff4.1736891751.git.jpoimboe@kernel.org/

I think the stack frame warning is #2048 and I think I saw a recent mailing list patch.

[computerix]

Yes, the stack frame size warning is #2048 and the patch in #2048 solves it.