[Mlir-commits] [mlir] [mlir][CMake] enable disabling MLIR_ENABLE_EXECUTION_ENGINE (PR #171060)

[Maksim Levental]

makslevental wrote:

> Can you clarify why we want this as an option?

Because you can't always build (or even use) the ExecutionEngine? E.g., on wasm32-emscripten nothing will work (not our ABI which uses `int64_t` everywhere, nor OrcJIT). So at best it's added compile cost (for such a target) for no benefit, and at worst it prevents building - I found this due hitting 

```
em++: error: undefined exported symbol: "_LLVMAddSymbol" [-Wundefined] [-Werror]
```

when linking `mlir_runner_utils` and `mlir_c_runner_utils`.

https://github.com/llvm/llvm-project/pull/171060