[flang-commits] [flang] [flang] Support discovering LLVM/Clang/MLIR without explicit *_DIR (PR #122639)

[Slava Zakharin via flang-commits]

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@@ -91,28 +91,37 @@ if (FLANG_STANDALONE_BUILD)
 
   # If the user specifies a relative path to LLVM_DIR, the calls to include
   # LLVM modules fail. Append the absolute path to LLVM_DIR instead.
-  get_filename_component(LLVM_DIR_ABSOLUTE ${LLVM_DIR}
-    REALPATH BASE_DIR ${CMAKE_CURRENT_BINARY_DIR})
-  list(APPEND CMAKE_MODULE_PATH ${LLVM_DIR_ABSOLUTE})
+  IF (LLVM_DIR)
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vzakhari wrote:

style:
```suggestion
  if (LLVM_DIR)
```

https://github.com/llvm/llvm-project/pull/122639