An `_mlirRegisterEverything.*.so` file from an old build that referenced
`MLIRPythonExtension.RegisterEverything`, but which no longer references
that extension in a new build, causes runtime errors in the new build
like:
ImportError: _mlirRegisterEverything.cpython-38-x86_64-linux-gnu.so: undefined symbol: mlirRegisterAllPasses
The error occurs because the MLIR Python binding tries to dynamically
import the `_mlirRegisterEverything` module but the dynamic importer
fails since the new build no longer references
`MLIRPythonExtension.RegisterEverything`.
One possible solution is for the user to manually remove the
`_mlirRegisterEverything.*.so` file. This patch instead resolves the
problem in code by printing a waning if the module cannot be
imported.
Reviewed By: stellaraccident
Differential Revision: https://reviews.llvm.org/D133450
b947e15a57