h-vetinari wrote:

How are out-of-tree builds supposed to work? I had added 
`-DLLVM_ENABLE_RUNTIMES="flang-rt"` to our existing flang builds (which 
leverage pre-built llvm, clang & mlir), and noticed that nothing related to 
`flang_rt` gets built. Upon closer inspection, this is unsurprising, because 
the config step ignored that variable:
```
CMake Warning:
-- Generating done (1.7s)
  Manually-specified variables were not used by the project:

    LLVM_ENABLE_RUNTIMES
```

https://github.com/llvm/llvm-project/pull/110217
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