[clang] [clang][PAC] Disallow -pedantic-errors in conjunction with pointer au… (PR #153503)

[Oliver Hunt via cfe-commits]

ojhunt wrote:

I think closing this is the correct approach and taking some variation of https://github.com/llvm/llvm-project/pull/153506 - essentially working to resolve the ODR/ABI impact of -pedantic-errors

https://github.com/llvm/llvm-project/pull/153503