[clang] Warn when unique objects might be duplicated in shared libraries (PR #117622)

[Hans Wennborg via cfe-commits]

zmodem wrote:

> I intend to make the warning on-by-default. However, it currently triggers at several places in the LLVM project, breaking the CI. Fixing them is nontrivial and cluttered up the PR, so I made it DefaultIgnore in order to keep things focused. Should the PR be accepted I plan to go through and clean things up, then default-enable the warning.

This sounds like a good approach.

Can you share a few of the examples where it triggers, to get a feel for what this looks like on the LLVM code?

https://github.com/llvm/llvm-project/pull/117622