[Mlir-commits] [mlir] [mlir][cmake] Enable -Wundef. (PR #84011)

[Ingo Müller]

ingomueller-net wrote:

The only new undefined macro [coming up in CI](https://buildkite.com/llvm-project/github-pull-requests/builds/44262#018e0ebc-6972-48a4-97ee-204509bec331) is `GTEST_NO_LLVM_SUPPORT`. I think it is unset for all LLVM except `compiler-rt`, so maybe we can add a compile definition for either the `mlir` or the `mlir/unittest` folder (or even all of LLVM?)

https://github.com/llvm/llvm-project/pull/84011