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Mention how to change LLVM commit level (#210)

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Kevin O'Brien 2020-07-07 16:43:01 -04:00 committed by GitHub
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@ -48,6 +48,10 @@ gcc >= 6.4
libprotoc >= 3.11.0
cmake >= 3.15.4
```
At any point in time, ONNX MLIR depends on a specific commit of the LLVM project that has been shown to work with the project. Periodically the maintainers
need to move to a more recent LLVM level. Among other things, this requires that the commit string in utils/clone-mlir.sh be updated. A consequence of
making this change is that the TravisCI build will fail until the Docker images that contain the prereqs are rebuilt. There is a GitHub workflow that rebuilds
this image for the amd64 architecture, but currently the ppc64le and s390x images must be rebuilt manually. The Dockerfiles to accomplish that are in the repo.
## Installation on UNIX