[Mlir-commits] [mlir] [mlir][python] declare `_PyClassMethod_New` undefined at link time (PR #121597)

[Maksim Levental]

================
@@ -683,6 +683,13 @@ function(add_mlir_python_extension libname extname)
           ${eh_rtti_enable}
       )
     endif()
+    
+    if(APPLE)
+      # NanobindAdaptors.h uses PyClassMethod_New to build `pure_subclass`es but nanobind
+      # doesn't declare this API as undefined in its linker flags. So we need to declare it as such
+      # for downstream users that do not do something like -undefined dynamic_lookup
----------------
makslevental wrote:

```suggestion
      # for downstream users that do not do something like `-undefined dynamic_lookup`.
```

https://github.com/llvm/llvm-project/pull/121597