Index: mlir/CMakeLists.txt
===================================================================
--- mlir/CMakeLists.txt
+++ mlir/CMakeLists.txt
@@ -1,3 +1,28 @@
+# Check if MLIR is built as a standalone project.
+if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+  project(mlir)
+  cmake_minimum_required(VERSION 3.13.4)
+
+  find_package(LLVM CONFIG REQUIRED)
+  set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+  include(HandleLLVMOptions)
+  include(AddLLVM)
+  include(TableGen)
+
+  include_directories(${LLVM_INCLUDE_DIRS})
+
+  set(LLVM_MAIN_SRC_DIR ${CMAKE_SOURCE_DIR}/../llvm CACHE PATH
+      "Path to LLVM source tree")
+  set(UNITTEST_DIR ${LLVM_MAIN_SRC_DIR}/utils/unittest)
+  if(EXISTS ${UNITTEST_DIR}/googletest/include/gtest/gtest.h)
+    add_subdirectory(${UNITTEST_DIR} utils/unittest)
+  endif()
+
+  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY
+    "${CMAKE_CURRENT_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX}")
+  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")
+endif()
+
 # MLIR project.
 set(MLIR_MAIN_SRC_DIR     ${CMAKE_CURRENT_SOURCE_DIR}  )
 set(MLIR_MAIN_INCLUDE_DIR ${MLIR_MAIN_SRC_DIR}/include )
@@ -5,6 +30,7 @@
 set(MLIR_SOURCE_DIR  ${CMAKE_CURRENT_SOURCE_DIR})
 set(MLIR_BINARY_DIR  ${CMAKE_CURRENT_BINARY_DIR})
 set(MLIR_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/include)
+set(MLIR_TOOLS_DIR   ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
 
@@ -95,7 +121,11 @@
 add_subdirectory(lib)
 if (MLIR_INCLUDE_TESTS)
   add_definitions(-DMLIR_INCLUDE_TESTS)
-  add_subdirectory(unittests)
+  if (TARGET gtest)
+    add_subdirectory(unittests)
+  else()
+    message(WARNING "gtest not found, unittests will not be available")
+  endif()
   add_subdirectory(test)
 endif()
 if (MLIR_INCLUDE_INTEGRATION_TESTS)
Index: mlir/lib/Conversion/GPUToNVVM/CMakeLists.txt
===================================================================
--- mlir/lib/Conversion/GPUToNVVM/CMakeLists.txt
+++ mlir/lib/Conversion/GPUToNVVM/CMakeLists.txt
@@ -1,6 +1,7 @@
 set(LLVM_TARGET_DEFINITIONS GPUToNVVM.td)
 mlir_tablegen(GPUToNVVM.cpp.inc -gen-rewriters)
 add_public_tablegen_target(MLIRGPUToNVVMIncGen)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 add_mlir_conversion_library(MLIRGPUToNVVMTransforms
   LowerGpuOpsToNVVMOps.cpp
Index: mlir/lib/Conversion/GPUToROCDL/CMakeLists.txt
===================================================================
--- mlir/lib/Conversion/GPUToROCDL/CMakeLists.txt
+++ mlir/lib/Conversion/GPUToROCDL/CMakeLists.txt
@@ -1,6 +1,7 @@
 set(LLVM_TARGET_DEFINITIONS GPUToROCDL.td)
 mlir_tablegen(GPUToROCDL.cpp.inc -gen-rewriters)
 add_public_tablegen_target(MLIRGPUToROCDLIncGen)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 add_mlir_conversion_library(MLIRGPUToROCDLTransforms
   LowerGpuOpsToROCDLOps.cpp
Index: mlir/lib/Conversion/GPUToSPIRV/CMakeLists.txt
===================================================================
--- mlir/lib/Conversion/GPUToSPIRV/CMakeLists.txt
+++ mlir/lib/Conversion/GPUToSPIRV/CMakeLists.txt
@@ -1,6 +1,7 @@
 set(LLVM_TARGET_DEFINITIONS GPUToSPIRV.td)
 mlir_tablegen(GPUToSPIRV.cpp.inc -gen-rewriters)
 add_public_tablegen_target(MLIRGPUToSPIRVIncGen)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 add_mlir_conversion_library(MLIRGPUToSPIRVTransforms
   ConvertGPUToSPIRV.cpp
Index: mlir/lib/Dialect/SPIRV/CMakeLists.txt
===================================================================
--- mlir/lib/Dialect/SPIRV/CMakeLists.txt
+++ mlir/lib/Dialect/SPIRV/CMakeLists.txt
@@ -2,6 +2,7 @@
 set(LLVM_TARGET_DEFINITIONS SPIRVCanonicalization.td)
 mlir_tablegen(SPIRVCanonicalization.inc -gen-rewriters)
 add_public_tablegen_target(MLIRSPIRVCanonicalizationIncGen)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 add_mlir_dialect_library(MLIRSPIRV
   LayoutUtils.cpp
Index: mlir/lib/Dialect/Shape/IR/CMakeLists.txt
===================================================================
--- mlir/lib/Dialect/Shape/IR/CMakeLists.txt
+++ mlir/lib/Dialect/Shape/IR/CMakeLists.txt
@@ -1,6 +1,7 @@
 set(LLVM_TARGET_DEFINITIONS ShapeCanonicalization.td)
 mlir_tablegen(ShapeCanonicalization.inc -gen-rewriters)
 add_public_tablegen_target(MLIRShapeCanonicalizationIncGen)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 add_mlir_dialect_library(MLIRShape
   Shape.cpp
Index: mlir/test/CMakeLists.txt
===================================================================
--- mlir/test/CMakeLists.txt
+++ mlir/test/CMakeLists.txt
@@ -39,7 +39,6 @@
 
 set(MLIR_TEST_DEPENDS
   FileCheck count not
-  MLIRUnitTests
   mlir-cpu-runner
   mlir-edsc-builder-api-test
   mlir-linalg-ods-gen
@@ -53,6 +52,9 @@
   mlir_runner_utils
   mlir_c_runner_utils
   )
+if(TARGET gtest)
+  list(APPEND MLIR_TEST_DEPENDS MLIRUnitTests)
+endif()
 
 if(LLVM_BUILD_EXAMPLES)
   list(APPEND MLIR_TEST_DEPENDS
Index: mlir/test/lib/Dialect/Test/CMakeLists.txt
===================================================================
--- mlir/test/lib/Dialect/Test/CMakeLists.txt
+++ mlir/test/lib/Dialect/Test/CMakeLists.txt
@@ -2,6 +2,7 @@
   TestDialect.cpp
   TestPatterns.cpp
 )
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 set(LLVM_TARGET_DEFINITIONS TestInterfaces.td)
 mlir_tablegen(TestTypeInterfaces.h.inc -gen-type-interface-decls)
Index: mlir/test/lit.cfg.py
===================================================================
--- mlir/test/lit.cfg.py
+++ mlir/test/lit.cfg.py
@@ -59,6 +59,10 @@
     'mlir-tblgen',
     'mlir-translate',
     'mlir-edsc-builder-api-test',
+    'mlir-cpu-runner',
+    'mlir-linalg-ods-gen',
+    'mlir-reduce',
+    'mlir-sdbm-api-test',
 ]
 
 # The following tools are optional
Index: mlir/unittests/TableGen/CMakeLists.txt
===================================================================
--- mlir/unittests/TableGen/CMakeLists.txt
+++ mlir/unittests/TableGen/CMakeLists.txt
@@ -21,6 +21,7 @@
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/../../test/lib/Dialect/Test)
 include_directories(${CMAKE_CURRENT_BINARY_DIR}/../../test/lib/Dialect/Test)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 target_link_libraries(MLIRTableGenTests
   PRIVATE MLIRTableGen MLIRIR