<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/147858>147858</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            CMake fails on mlir when building for Xcode
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            mlir
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          Iritscen
      </td>
    </tr>
</table>

<pre>
    When issuing this command: `cmake -B build-Xcode -G "Xcode" -S llvm -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;mlir" -DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_ASSERTIONS=OFF -DCMAKE_OSX_SYSROOT=$(xcrun --sdk macosx --show-sdk-path)`

I get this error:
```
CMake Error in /path/to/llvm-project/mlir/include/mlir/Dialect/Arith/IR/CMakeLists.txt:
 The custom command generating

 /path/to/llvm-project/build-Xcode/tools/mlir/include/mlir/Dialect/Arith/IR/ArithOpsEnums.h.inc

 is attached to multiple targets:

    MLIRArithOpsIncGen
 MLIRArithOpsInterfacesIncGen

  but none of these is a common dependency of the other(s).  This is not
  allowed by the Xcode "new build system".
```

Removing "mlir" from -DLLVM_ENABLE_PROJECTS allows CMake to proceed successfully.  This is with CMake version 3.31.7.
</pre>
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