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diff --git a/mlir/CMakeLists.txt b/mlir/CMakeLists.txt
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index 806eb42db..5fa0c16dc 100644
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--- a/mlir/CMakeLists.txt
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+++ b/mlir/CMakeLists.txt
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@@ -1,4 +1,50 @@
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-# MLIR project.
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+# Check if this is a in tree build.
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+if (NOT DEFINED LLVM_MAIN_SRC_DIR)
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+ project(Mlir)
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+ cmake_minimum_required(VERSION 3.13.4)
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+
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+ # Where is LLVM installed?
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+ find_package(LLVM CONFIG REQUIRED)
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+ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
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+ include(HandleLLVMOptions)
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+ include(AddLLVM)
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+ include(TableGen)
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+
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+ # Add the llvm header path.
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+ include_directories(${LLVM_INCLUDE_DIRS})
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+ # Local builddir generated header inclusion
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+ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I.")
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+
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+ # Sources available, too?
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+ if (LLVM_BUILD_MAIN_SRC_DIR)
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+ set(LLVM_SOURCE_ROOT ${LLVM_BUILD_MAIN_SRC_DIR} CACHE PATH
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+ "Path to LLVM source tree")
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+ else()
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+ execute_process(COMMAND "${LLVM_TOOLS_BINARY_DIR}/llvm-config" --src-root
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+ OUTPUT_VARIABLE MAIN_SRC_DIR
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+ OUTPUT_STRIP_TRAILING_WHITESPACE)
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+ set(LLVM_SOURCE_ROOT ${MAIN_SRC_DIR} CACHE PATH "Path to LLVM source tree")
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+ endif()
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+
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+ # Make sure the isl c files are built as fPIC
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+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
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+
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+ # Set directory for mlir test.
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+ set(MLIR_TOOLS_DIR "${CMAKE_CURRENT_BINARY_DIR}/bin")
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+ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")
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+ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")
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+
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+ if (LLVM_ENABLE_DOXYGEN)
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+ message(STATUS "Doxygen enabled.")
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+ find_package(Doxygen REQUIRED)
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+ else()
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+ message(STATUS "Doxygen disabled.")
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+ endif()
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+
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+else ()
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+ set(LLVM_SOURCE_ROOT "${LLVM_MAIN_SRC_DIR}")
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+endif ()
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+
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set(MLIR_MAIN_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR} )
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set(MLIR_MAIN_INCLUDE_DIR ${MLIR_MAIN_SRC_DIR}/include )
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