1 # An out-of-tree MLIR dialect
3 This is an example of an out-of-tree [MLIR](https://mlir.llvm.org/) dialect along with a standalone `opt`-like tool to operate on that dialect.
5 ## Building - Component Build
7 This setup assumes that you have built LLVM and MLIR in `$BUILD_DIR` and installed them to `$PREFIX`. To build and launch the tests, run
9 mkdir build && cd build
10 cmake -G Ninja .. -DMLIR_DIR=$PREFIX/lib/cmake/mlir -DLLVM_EXTERNAL_LIT=$BUILD_DIR/bin/llvm-lit
11 cmake --build . --target check-standalone
13 To build the documentation from the TableGen description of the dialect operations, run
15 cmake --build . --target mlir-doc
17 **Note**: Make sure to pass `-DLLVM_INSTALL_UTILS=ON` when building LLVM with CMake in order to install `FileCheck` to the chosen installation prefix.
19 ## Building - Monolithic Build
21 This setup assumes that you build the project as part of a monolithic LLVM build via the `LLVM_EXTERNAL_PROJECTS` mechanism.
22 To build LLVM, MLIR, the example and launch the tests run
24 mkdir build && cd build
25 cmake -G Ninja `$LLVM_SRC_DIR/llvm` \
26 -DCMAKE_BUILD_TYPE=Release \
27 -DLLVM_TARGETS_TO_BUILD=host \
28 -DLLVM_ENABLE_PROJECTS=mlir \
29 -DLLVM_EXTERNAL_PROJECTS=standalone-dialect -DLLVM_EXTERNAL_STANDALONE_DIALECT_SOURCE_DIR=../
30 cmake --build . --target check-standalone
32 Here, `$LLVM_SRC_DIR` needs to point to the root of the monorepo.