From c567781fa3ecef324f7d311a6222cf75250f2173 Mon Sep 17 00:00:00 2001
From: Byron Changuion <7623249+byronChanguion@users.noreply.github.com>
Date: Sun, 19 Apr 2020 07:11:24 -0700
Subject: [PATCH] Add support for Windows using Visual Studio Compiler (#86)

* Move to more recent LLVM commit ID

* Update LLVM cache version from V9 to V10

* Update to latest LLVM commit id from master, roll back conditions in util scripts

* Update circlci LLVM cache tag to ensure ci updates builds with latest LLVM commit id

* Update README.md to have matching LLVM commit id

* Update doc/Dialtects/onnx.md

* Enable onnx-mlir for VS builds on Windows

* Update README to include lit

* Update build command for Windows to include config

* Update build instructions, add cmd files for windows, enable single source of truth for MLIR commit-id (clone-mlir.sh)

* Add Visual Studio workload info

* Update ONNX op definitions

* Revert onnx submodule back to previous commit, disable warnings in CMakeLists to work around build issues with MSVC

* Update environment for path to PDcurses on Windows

* Fix directory strings to be compatible with Windows or Linux style slashes

* Fix install-mlir.sh so it works when sourced

* Ensure README and cmd files match and have correct paths

* Properly quote ONNX_MLIR_SRC_DIR

* Address PR feedback: Use llvm_unreachable to indicate failure to convert attribute proto to name/value pair

Co-authored-by: Tian Jin <tjingrant@gmail.com>
---
 CMakeLists.txt                                |   6 +
 MLIR.cmake                                    |  92 ++++++++++++--
 README.md                                     | 114 +++++++++++++++++-
 docs/README.md                                | 114 +++++++++++++++++-
 src/Builder/FrontendDialectTransformer.cpp    |   2 +
 .../ONNXToKrnl/Math/Elementwise.cpp           |   2 +
 .../ONNXToKrnl/ONNXToKrnlCommon.cpp           |   2 +-
 src/Dialect/Krnl/KrnlOps.cpp                  |   3 +
 src/Dialect/ONNX/ONNXOps.cpp                  |   2 +-
 test/mlir/lit.site.cfg.py.in                  |  17 +--
 utils/build-mlir.cmd                          |  16 +++
 utils/build-mlir.sh                           |  12 ++
 utils/clone-mlir.sh                           |   3 +
 utils/install-mlir.cmd                        |   8 ++
 utils/install-mlir.sh                         |  17 +--
 utils/install-onnx-mlir.cmd                   |  16 +++
 16 files changed, 380 insertions(+), 46 deletions(-)
 create mode 100644 utils/build-mlir.cmd
 create mode 100644 utils/build-mlir.sh
 create mode 100644 utils/clone-mlir.sh
 create mode 100644 utils/install-mlir.cmd
 create mode 100644 utils/install-onnx-mlir.cmd

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f2f7dee..e3b474d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,12 +13,18 @@ set(CMAKE_CXX_FLAGS_RELEASE "-O2 -DNDEBUG")
 
 set(ONNX_MLIR_SRC_ROOT "${CMAKE_CURRENT_SOURCE_DIR}")
 set(ONNX_MLIR_BIN_ROOT "${CMAKE_CURRENT_BINARY_DIR}")
+
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
 include(MLIR.cmake)
 
+if (MSVC)
+  # Disable warnings that prevent building of dependencies
+  # like onnx
+  set(CMAKE_CXX_FLAGS "-wd4244 -wd4267 -wd4530 -wd4624")
+endif()
 add_subdirectory(third_party/onnx)
 add_subdirectory(third_party/benchmark)
 add_subdirectory(third_party/pybind11)
diff --git a/MLIR.cmake b/MLIR.cmake
index 873c480..ba3fc12 100644
--- a/MLIR.cmake
+++ b/MLIR.cmake
@@ -25,16 +25,55 @@ else()
 endif()
 
 # LLVM project lib folder
-set(LLVM_PROJECT_LIB ${LLVM_PROJ_BUILD}/lib)
+if (ENV{LLVM_PROJECT_LIB})
+  set(LLVM_PROJECT_LIB $ENV{LLVM_PROJECT_LIB})
+else()
+  if(MSVC)
+    if (CMAKE_BUILD_TYPE)
+      set(LLVM_PROJECT_LIB ${LLVM_PROJ_BUILD}/${CMAKE_BUILD_TYPE}/lib)
+    else()
+      set(LLVM_PROJECT_LIB ${LLVM_PROJ_BUILD}/release/lib)
+    endif()  
+  else()
+    set(LLVM_PROJECT_LIB ${LLVM_PROJ_BUILD}/lib)
+  endif()
+endif()
+message(STATUS "LLVM_PROJECT_LIB:" ${LLVM_PROJECT_LIB})
+
+# LLVM project bin folder
+if (ENV{LLVM_PROJ_BIN})
+  set(LLVM_PROJ_BIN $ENV{LLVM_PROJ_BIN})
+else()
+  if(MSVC)
+    if (CMAKE_BUILD_TYPE)
+      set(LLVM_PROJ_BIN ${LLVM_PROJ_BUILD}/${CMAKE_BUILD_TYPE}/bin)
+    else()
+      set(LLVM_PROJ_BIN ${LLVM_PROJ_BUILD}/Release/bin)
+    endif()
+  else()
+    set(LLVM_PROJ_BIN ${LLVM_PROJ_BUILD}/bin)
+  endif()
+endif()
+message(STATUS "LLVM_PROJ_BIN:" ${LLVM_PROJ_BIN})
 
 # Include paths for MLIR
 set(LLVM_SRC_INCLUDE_PATH ${LLVM_PROJ_SRC}/llvm/include)
 set(LLVM_BIN_INCLUDE_PATH ${LLVM_PROJ_BUILD}/include)
 set(MLIR_SRC_INCLUDE_PATH ${LLVM_PROJ_SRC}/mlir/include)
 set(MLIR_BIN_INCLUDE_PATH ${LLVM_PROJ_BUILD}/tools/mlir/include)
-set(MLIR_TOOLS_DIR ${LLVM_PROJ_BUILD}/bin)
+set(MLIR_TOOLS_DIR ${LLVM_PROJ_BIN})
 
-set(ONNX_MLIR_TOOLS_DIR ${ONNX_MLIR_BIN_ROOT}/bin)
+# ONNX-MLIR tools folder
+if(MSVC)
+  if (CMAKE_BUILD_TYPE)
+    set(ONNX_MLIR_TOOLS_DIR ${CMAKE_BINARY_DIR}/bin/${CMAKE_BUILD_TYPE})
+  else()
+    set(ONNX_MLIR_TOOLS_DIR ${CMAKE_BINARY_DIR}/bin/Release)
+  endif()
+else()
+  set(ONNX_MLIR_TOOLS_DIR ${CMAKE_BINARY_DIR}/bin)
+endif()
+message(STATUS "ONNX_MLIR_TOOLS_DIR:" ${ONNX_MLIR_TOOLS_DIR})
 set(ONNX_MLIR_LIT_TEST_SRC_DIR ${ONNX_MLIR_SRC_ROOT}/test/mlir)
 set(ONNX_MLIR_LIT_TEST_BUILD_DIR ${CMAKE_BINARY_DIR}/test/mlir)
 
@@ -53,8 +92,35 @@ message(STATUS "BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS}")
 # Threading libraries required due to parallel pass execution.
 find_package(Threads REQUIRED)
 # libcurses and libz required by libLLVMSupport
-find_package(Curses REQUIRED)
-find_package(ZLIB REQUIRED)
+if(MSVC)
+  if(DEFINED ENV{CURSES_LIB_PATH})
+    find_library(CURSES_LIBRARIES
+            NAMES pdcurses
+            PATHS $ENV{CURSES_LIB_PATH}
+            NO_DEFAULT_PATH)
+    if(CURSES_LIBRARIES)
+      message(STATUS "CURSES_LIBRARIES: ${CURSES_LIBRARIES}")
+    else()
+      message(FATAL_ERROR "Could not find curses library at $ENV{CURSES_LIB_PATH}")
+    endif()
+  else()
+      message(FATAL_ERROR "Expected CURSES_LIB_PATH environment variable to be set to location of pdcurses.lib")
+  endif()
+else()
+  find_package(Curses REQUIRED)
+  find_package(ZLIB REQUIRED)
+endif()
+
+# Set output library path
+if(MSVC)
+  if (CMAKE_BUILD_TYPE)
+    set(ONNX_MLIR_LIB_DIR ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${CMAKE_BUILD_TYPE})
+  else()
+    set(ONNX_MLIR_LIB_DIR ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/Release)
+  endif()
+else()
+    set(ONNX_MLIR_LIB_DIR ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
+endif()
 
 function(find_mlir_lib lib)
   find_library(${lib}
@@ -171,8 +237,8 @@ set(MLIRLibs
         ${LLVMSupport}
         ${LLVMDemangle}
         ${CMAKE_THREAD_LIBS_INIT}
-	${CURSES_LIBRARIES}
-	${ZLIB_LIBRARIES})
+	      ${CURSES_LIBRARIES}
+	      ${ZLIB_LIBRARIES})
 
 # MLIR libraries that must be linked with --whole-archive for static build or
 # must be specified on LD_PRELOAD for shared build.
@@ -211,7 +277,7 @@ function(whole_archive_link target lib_dir)
     endforeach(LIB)
   elseif(MSVC)
     foreach(LIB ${ARGN})
-      string(CONCAT link_flags ${link_flags} "/WHOLEARCHIVE:${LIB} ")
+      string(CONCAT link_flags ${link_flags} "/WHOLEARCHIVE:${lib_dir}/${LIB} ")
     endforeach(LIB)
   else()
     set(link_flags "${link_flags} -L${lib_dir} -Wl,--whole-archive,")
@@ -241,9 +307,9 @@ endfunction(ld_preload_libs)
 
 function(whole_archive_link_mlir target)
   if(BUILD_SHARED_LIBS)
-    ld_preload_libs(${target} ${LLVM_PROJ_BUILD}/lib ${ARGN})
+    ld_preload_libs(${target} ${LLVM_PROJECT_LIB} ${ARGN})
   else()
-    whole_archive_link(${target} ${LLVM_PROJ_BUILD}/lib ${ARGN})
+    whole_archive_link(${target} ${LLVM_PROJECT_LIB} ${ARGN})
   endif()
 endfunction(whole_archive_link_mlir)
 
@@ -252,9 +318,9 @@ function(whole_archive_link_onnx_mlir target)
     add_dependencies(${target} ${lib_target})
   endforeach(lib_target)
   if(BUILD_SHARED_LIBS)
-    ld_preload_libs(${target} ${CMAKE_BINARY_DIR}/lib ${ARGN})
+    ld_preload_libs(${target} ${ONNX_MLIR_LIB_DIR} ${ARGN})
   else()
-    whole_archive_link(${target} ${CMAKE_BINARY_DIR}/lib ${ARGN})
+    whole_archive_link(${target} ${ONNX_MLIR_LIB_DIR} ${ARGN})
   endif()
 endfunction(whole_archive_link_onnx_mlir)
 
@@ -281,7 +347,7 @@ endfunction()
 # table gen utility itself can be detected and cause re-compilation of .td file.
 add_executable(mlir-tblgen IMPORTED)
 set_property(TARGET mlir-tblgen
-        PROPERTY IMPORTED_LOCATION ${LLVM_PROJ_BUILD}/bin/mlir-tblgen)
+        PROPERTY IMPORTED_LOCATION ${LLVM_PROJ_BIN}/mlir-tblgen)
 set(MLIR_TABLEGEN_EXE mlir-tblgen)
 
 # Add a dialect used by ONNX MLIR and copy the generated operation
diff --git a/README.md b/README.md
index bc4f421..7e12e65 100644
--- a/README.md
+++ b/README.md
@@ -11,15 +11,20 @@ libprotoc >= 3.11.0
 cmake >= 3.15.4
 ```
 
-## Installation
+## Installation on UNIX
 
+#### MLIR
 Firstly, install MLIR (as a part of LLVM-Project):
 
-[same-as-file]: <> (utils/install-mlir.sh)
+[same-as-file]: <> (utils/clone-mlir.sh)
 ``` bash
 git clone https://github.com/llvm/llvm-project.git
 # Check out a specific branch that is known to work with ONNX MLIR.
 cd llvm-project && git checkout 07e462526d0cbae40b320e1a4307ce11e197fb0a && cd ..
+```
+
+[same-as-file]: <> (utils/build-mlir.sh)
+``` bash
 mkdir llvm-project/build
 cd llvm-project/build
 cmake -G Ninja ../llvm \
@@ -34,6 +39,7 @@ cmake --build . --target -- ${MAKEFLAGS}
 cmake --build . --target check-mlir
 ```
 
+#### ONNX-MLIR (this project)
 Two environment variables need to be set:
 - LLVM_PROJ_SRC should point to the llvm-project src directory (e.g., llvm-project/).
 - LLVM_PROJ_BUILD should point to the llvm-project build directory (e.g., llvm-project/build).
@@ -41,7 +47,7 @@ Two environment variables need to be set:
 To build ONNX-MLIR, use the following command:
 
 [same-as-file]: <> ({"ref": "utils/install-onnx-mlir.sh", "skip-doc": 2})
-```
+```bash
 git clone --recursive https://github.com/onnx/onnx-mlir.git
 
 # Export environment variables pointing to LLVM-Projects.
@@ -59,7 +65,107 @@ cmake --build . --target check-onnx-lit
 
 After the above commands succeed, an `onnx-mlir` executable should appear in the `bin` directory. 
 
-## Using ONNX MLIR
+## Installation on Windows
+Building onnx-mlir on Windows requires building some additional prerequisites that are not available by default.
+
+Note that the instructions in this file assume you are using [Visual Studio  2019 Community Edition](https://visualstudio.microsoft.com/downloads/). It is recommended that you have the **Desktop development with C++** and **Linux development with C++** workloads installed. This ensures you have all toolchains and libraries needed to compile this project and its dependencies on Windows.
+
+Run all the commands from a shell started from **"Developer Command Prompt for VS 2019"**.
+
+#### Protobuf
+Build protobuf as a static library.
+
+```shell
+set root_dir=%cd%
+git clone --recurse-submodules https://github.com/protocolbuffers/protobuf.git
+cd protobuf
+cd cmake
+cmake -G "Visual Studio 16 2019" -A x64 -T host=x64 -DCMAKE_BUILD_TYPE=Release -Dprotobuf_MSVC_STATIC_RUNTIME=OFF -Dprotobuf_BUILD_TESTS=OFF -Dprotobuf_BUILD_EXAMPLES=OFF -Dprotobuf_WITH_ZLIB=OFF -DCMAKE_INSTALL_PREFIX="%root_dir%\protobuf\install"
+call msbuild protobuf.sln /m /p:Configuration=Release
+call msbuild INSTALL.vcxproj /p:Configuration=Release
+```
+
+Before running CMake for onnx-mlir, ensure that the bin directory to this protobuf is before any others in your PATH:
+```shell
+set PATH=%root_dir%\protobuf\install\bin;%PATH%
+```
+
+#### PDCurses
+Build a local version of the curses library, used by various commandline tools in onnx-mlir. These instructions assume you use [Public Domain Curses](https://pdcurses.org/).
+
+Run this from a Visual Studio developer command prompt since you will need access to the appropriate version of Visual Studio's nmake tool.
+
+```shell
+set root_dir=%cd%
+git clone https://github.com/wmcbrine/PDCurses.git
+set PDCURSES_SRCDIR=%root_dir%/PDCurses
+cd PDCurses
+call nmake -f wincon/Makefile.vc
+```
+
+#### MLIR
+Install MLIR (as a part of LLVM-Project):
+
+[same-as-file]: <> (utils/clone-mlir.sh)
+```shell
+git clone https://github.com/llvm/llvm-project.git
+# Check out a specific branch that is known to work with ONNX MLIR.
+cd llvm-project && git checkout 07e462526d0cbae40b320e1a4307ce11e197fb0a && cd ..
+```
+
+[same-as-file]: <> (utils/build-mlir.cmd)
+```shell
+set root_dir=%cd%
+md llvm-project\build
+cd llvm-project\build
+call cmake -G "Visual Studio 16 2019" -A x64 -T host=x64 ..\llvm ^
+   -DCMAKE_INSTALL_PREFIX="%root_dir%\llvm-project\build\install" ^
+   -DLLVM_ENABLE_PROJECTS=mlir ^
+   -DLLVM_BUILD_EXAMPLES=ON ^
+   -DLLVM_TARGETS_TO_BUILD="host" ^
+   -DCMAKE_BUILD_TYPE=Release ^
+   -DLLVM_ENABLE_ASSERTIONS=ON ^
+   -DLLVM_ENABLE_RTTI=ON ^
+   -DLLVM_ENABLE_ZLIB=OFF
+
+call cmake --build . --config Release --target -- /m
+call cmake --build . --config Release --target install
+call cmake --build . --config Release --target check-mlir
+```
+
+#### ONNX-MLIR (this project)
+The following environment variables need to be set before building onnx-mlir:
+- CURSES_LIB_PATH: Path to curses library (e.g. c:/repos/PDCurses)
+- LLVM_PROJ_BUILD: Path to the build directory for LLVM (e.g. c:/repos/llvm-project/build)
+- LLVM_PROJ_SRC: Path to the source directory for LLVM (e.g. c:/repos/llvm-project)
+
+This project uses lit ([LLVM's Integrated Tester](http://llvm.org/docs/CommandGuide/lit.html)) for unit tests. When running CMake, we will also specify the path to the lit tool from LLVM using the LLVM_EXTERNAL_LIT define.
+
+To build ONNX MLIR, use the following command:
+
+[same-as-file]: <> (utils/install-onnx-mlir.cmd)
+```shell
+git clone --recursive https://github.com/onnx/onnx-mlir.git
+
+REM Export environment variables pointing to LLVM-Projects.
+set root_dir=%cd%
+set CURSES_LIB_PATH=%root_dir%/PDCurses
+set LLVM_PROJ_BUILD=%root_dir%/llvm-project/build
+set LLVM_PROJ_SRC=%root_dir%/llvm-project
+
+md onnx-mlir\build
+cd onnx-mlir\build
+call cmake -G "Visual Studio 16 2019" -A x64 -T host=x64 -DLLVM_EXTERNAL_LIT="%root_dir%\llvm-project\build\Release\bin\llvm-lit.py" -DCMAKE_BUILD_TYPE=Release ..
+call cmake --build . --config Release --target onnx-mlir -- /m
+
+REM Run FileCheck tests
+set LIT_OPTS=-v
+call cmake --build . --config Release --target check-onnx-lit
+```
+
+After the above commands succeed, an `onnx-mlir` executable should appear in the `bin` directory. 
+
+## Using ONNX-MLIR
 
 The usage of `onnx-mlir` is as such:
 ```
diff --git a/docs/README.md b/docs/README.md
index bc4f421..7e12e65 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -11,15 +11,20 @@ libprotoc >= 3.11.0
 cmake >= 3.15.4
 ```
 
-## Installation
+## Installation on UNIX
 
+#### MLIR
 Firstly, install MLIR (as a part of LLVM-Project):
 
-[same-as-file]: <> (utils/install-mlir.sh)
+[same-as-file]: <> (utils/clone-mlir.sh)
 ``` bash
 git clone https://github.com/llvm/llvm-project.git
 # Check out a specific branch that is known to work with ONNX MLIR.
 cd llvm-project && git checkout 07e462526d0cbae40b320e1a4307ce11e197fb0a && cd ..
+```
+
+[same-as-file]: <> (utils/build-mlir.sh)
+``` bash
 mkdir llvm-project/build
 cd llvm-project/build
 cmake -G Ninja ../llvm \
@@ -34,6 +39,7 @@ cmake --build . --target -- ${MAKEFLAGS}
 cmake --build . --target check-mlir
 ```
 
+#### ONNX-MLIR (this project)
 Two environment variables need to be set:
 - LLVM_PROJ_SRC should point to the llvm-project src directory (e.g., llvm-project/).
 - LLVM_PROJ_BUILD should point to the llvm-project build directory (e.g., llvm-project/build).
@@ -41,7 +47,7 @@ Two environment variables need to be set:
 To build ONNX-MLIR, use the following command:
 
 [same-as-file]: <> ({"ref": "utils/install-onnx-mlir.sh", "skip-doc": 2})
-```
+```bash
 git clone --recursive https://github.com/onnx/onnx-mlir.git
 
 # Export environment variables pointing to LLVM-Projects.
@@ -59,7 +65,107 @@ cmake --build . --target check-onnx-lit
 
 After the above commands succeed, an `onnx-mlir` executable should appear in the `bin` directory. 
 
-## Using ONNX MLIR
+## Installation on Windows
+Building onnx-mlir on Windows requires building some additional prerequisites that are not available by default.
+
+Note that the instructions in this file assume you are using [Visual Studio  2019 Community Edition](https://visualstudio.microsoft.com/downloads/). It is recommended that you have the **Desktop development with C++** and **Linux development with C++** workloads installed. This ensures you have all toolchains and libraries needed to compile this project and its dependencies on Windows.
+
+Run all the commands from a shell started from **"Developer Command Prompt for VS 2019"**.
+
+#### Protobuf
+Build protobuf as a static library.
+
+```shell
+set root_dir=%cd%
+git clone --recurse-submodules https://github.com/protocolbuffers/protobuf.git
+cd protobuf
+cd cmake
+cmake -G "Visual Studio 16 2019" -A x64 -T host=x64 -DCMAKE_BUILD_TYPE=Release -Dprotobuf_MSVC_STATIC_RUNTIME=OFF -Dprotobuf_BUILD_TESTS=OFF -Dprotobuf_BUILD_EXAMPLES=OFF -Dprotobuf_WITH_ZLIB=OFF -DCMAKE_INSTALL_PREFIX="%root_dir%\protobuf\install"
+call msbuild protobuf.sln /m /p:Configuration=Release
+call msbuild INSTALL.vcxproj /p:Configuration=Release
+```
+
+Before running CMake for onnx-mlir, ensure that the bin directory to this protobuf is before any others in your PATH:
+```shell
+set PATH=%root_dir%\protobuf\install\bin;%PATH%
+```
+
+#### PDCurses
+Build a local version of the curses library, used by various commandline tools in onnx-mlir. These instructions assume you use [Public Domain Curses](https://pdcurses.org/).
+
+Run this from a Visual Studio developer command prompt since you will need access to the appropriate version of Visual Studio's nmake tool.
+
+```shell
+set root_dir=%cd%
+git clone https://github.com/wmcbrine/PDCurses.git
+set PDCURSES_SRCDIR=%root_dir%/PDCurses
+cd PDCurses
+call nmake -f wincon/Makefile.vc
+```
+
+#### MLIR
+Install MLIR (as a part of LLVM-Project):
+
+[same-as-file]: <> (utils/clone-mlir.sh)
+```shell
+git clone https://github.com/llvm/llvm-project.git
+# Check out a specific branch that is known to work with ONNX MLIR.
+cd llvm-project && git checkout 07e462526d0cbae40b320e1a4307ce11e197fb0a && cd ..
+```
+
+[same-as-file]: <> (utils/build-mlir.cmd)
+```shell
+set root_dir=%cd%
+md llvm-project\build
+cd llvm-project\build
+call cmake -G "Visual Studio 16 2019" -A x64 -T host=x64 ..\llvm ^
+   -DCMAKE_INSTALL_PREFIX="%root_dir%\llvm-project\build\install" ^
+   -DLLVM_ENABLE_PROJECTS=mlir ^
+   -DLLVM_BUILD_EXAMPLES=ON ^
+   -DLLVM_TARGETS_TO_BUILD="host" ^
+   -DCMAKE_BUILD_TYPE=Release ^
+   -DLLVM_ENABLE_ASSERTIONS=ON ^
+   -DLLVM_ENABLE_RTTI=ON ^
+   -DLLVM_ENABLE_ZLIB=OFF
+
+call cmake --build . --config Release --target -- /m
+call cmake --build . --config Release --target install
+call cmake --build . --config Release --target check-mlir
+```
+
+#### ONNX-MLIR (this project)
+The following environment variables need to be set before building onnx-mlir:
+- CURSES_LIB_PATH: Path to curses library (e.g. c:/repos/PDCurses)
+- LLVM_PROJ_BUILD: Path to the build directory for LLVM (e.g. c:/repos/llvm-project/build)
+- LLVM_PROJ_SRC: Path to the source directory for LLVM (e.g. c:/repos/llvm-project)
+
+This project uses lit ([LLVM's Integrated Tester](http://llvm.org/docs/CommandGuide/lit.html)) for unit tests. When running CMake, we will also specify the path to the lit tool from LLVM using the LLVM_EXTERNAL_LIT define.
+
+To build ONNX MLIR, use the following command:
+
+[same-as-file]: <> (utils/install-onnx-mlir.cmd)
+```shell
+git clone --recursive https://github.com/onnx/onnx-mlir.git
+
+REM Export environment variables pointing to LLVM-Projects.
+set root_dir=%cd%
+set CURSES_LIB_PATH=%root_dir%/PDCurses
+set LLVM_PROJ_BUILD=%root_dir%/llvm-project/build
+set LLVM_PROJ_SRC=%root_dir%/llvm-project
+
+md onnx-mlir\build
+cd onnx-mlir\build
+call cmake -G "Visual Studio 16 2019" -A x64 -T host=x64 -DLLVM_EXTERNAL_LIT="%root_dir%\llvm-project\build\Release\bin\llvm-lit.py" -DCMAKE_BUILD_TYPE=Release ..
+call cmake --build . --config Release --target onnx-mlir -- /m
+
+REM Run FileCheck tests
+set LIT_OPTS=-v
+call cmake --build . --config Release --target check-onnx-lit
+```
+
+After the above commands succeed, an `onnx-mlir` executable should appear in the `bin` directory. 
+
+## Using ONNX-MLIR
 
 The usage of `onnx-mlir` is as such:
 ```
diff --git a/src/Builder/FrontendDialectTransformer.cpp b/src/Builder/FrontendDialectTransformer.cpp
index cb79974..f094761 100644
--- a/src/Builder/FrontendDialectTransformer.cpp
+++ b/src/Builder/FrontendDialectTransformer.cpp
@@ -80,6 +80,7 @@ private:
     case onnx::TensorProto_DataType::TensorProto_DataType_COMPLEX64:
     case onnx::TensorProto_DataType::TensorProto_DataType_COMPLEX128:
     case onnx::TensorProto_DataType::TensorProto_DataType_UNDEFINED:
+    default:
       assert(false && "Unsupported data type encountered.");
       return nullptr;
     }
@@ -209,6 +210,7 @@ private:
       assert(false && "datatype for attribute is not implemented");
       break;
     }
+    llvm_unreachable("Failed to convert attribute proto to name/value pair");
   }
 
   std::vector<mlir::NamedAttribute>
diff --git a/src/Conversion/ONNXToKrnl/Math/Elementwise.cpp b/src/Conversion/ONNXToKrnl/Math/Elementwise.cpp
index be9d031..f8adb20 100644
--- a/src/Conversion/ONNXToKrnl/Math/Elementwise.cpp
+++ b/src/Conversion/ONNXToKrnl/Math/Elementwise.cpp
@@ -412,6 +412,7 @@ Value emitScalarOpFor<ONNXSignOp>(ConversionPatternRewriter &rewriter,
     return result;
   } else {
     emitError(loc, "unsupported element type");
+    return {};
   }
 }
 
@@ -469,6 +470,7 @@ Value emitScalarOpFor<ONNXAbsOp>(ConversionPatternRewriter &rewriter,
         loc, lessThanZero, negativeOperand, operand);
   } else {
     emitError(loc, "unsupported element type");
+    return {};
   }
 }
 
diff --git a/src/Conversion/ONNXToKrnl/ONNXToKrnlCommon.cpp b/src/Conversion/ONNXToKrnl/ONNXToKrnlCommon.cpp
index d79490b..5a7ae4e 100644
--- a/src/Conversion/ONNXToKrnl/ONNXToKrnlCommon.cpp
+++ b/src/Conversion/ONNXToKrnl/ONNXToKrnlCommon.cpp
@@ -273,7 +273,7 @@ getBroadcastedDimInfo(Location loc, ConversionPatternRewriter &rewriter,
     auto shape = operands[i].getType().cast<MemRefType>().getShape();
     int size = shape.size();
     for (int j = 0; j < shape.size(); ++j) {
-      if (shape[j] < 0 and sharedDimCount[rank - size + j] > 1) {
+      if (shape[j] < 0 && sharedDimCount[rank - size + j] > 1) {
         auto dim = rewriter.create<DimOp>(loc, operands[i], j).getResult();
         auto one = rewriter.create<ConstantIndexOp>(loc, 1);
         auto isBroadcasted =
diff --git a/src/Dialect/Krnl/KrnlOps.cpp b/src/Dialect/Krnl/KrnlOps.cpp
index fbe0c34..6142701 100644
--- a/src/Dialect/Krnl/KrnlOps.cpp
+++ b/src/Dialect/Krnl/KrnlOps.cpp
@@ -75,6 +75,7 @@ ParseResult parseKrnlDefineLoopsOp(
       numLoops.getValue().getSExtValue(), LoopType::get(builder.getContext()));
   if (parser.addTypesToList(loopTypes, result.types))
     return failure();
+  return success();
 }
 
 //===----------------------------------------------------------------------===//
@@ -288,6 +289,7 @@ ParseResult parseKrnlIterateOp(OpAsmParser &parser, OperationState &result) {
           builder.getConstantAffineMap(integerAttr.getValue().getSExtValue());
       boundMaps.emplace_back(AffineMapAttr::get(map));
     }
+    return success();
   };
 
   while (failed(parser.parseOptionalRParen())) {
@@ -335,6 +337,7 @@ ParseResult parseKrnlIterateOp(OpAsmParser &parser, OperationState &result) {
 static LogicalResult verify(KrnlIterateOp op) {
   // TODO: Verify number of induction variable bounds matches the number of
   // input loops.
+  return success();
 }
 
 //===----------------------------------------------------------------------===//
diff --git a/src/Dialect/ONNX/ONNXOps.cpp b/src/Dialect/ONNX/ONNXOps.cpp
index 5da613f..b407c85 100644
--- a/src/Dialect/ONNX/ONNXOps.cpp
+++ b/src/Dialect/ONNX/ONNXOps.cpp
@@ -852,7 +852,7 @@ bool ONNXGemmOp::inferShapes() {
   N = (transB() == 0) ? rhsTy.getShape()[1] : rhsTy.getShape()[0];
   K_B = (transB() == 0) ? rhsTy.getShape()[0] : rhsTy.getShape()[1];
 
-  if ((K_A != -1) and (K_B != -1) and (K_A != K_B)) {
+  if ((K_A != -1) && (K_B != -1) && (K_A != K_B)) {
     emitError("Tensor shapes mismatched");
   }
 
diff --git a/test/mlir/lit.site.cfg.py.in b/test/mlir/lit.site.cfg.py.in
index d81581c..28df6b2 100644
--- a/test/mlir/lit.site.cfg.py.in
+++ b/test/mlir/lit.site.cfg.py.in
@@ -2,18 +2,19 @@
 import lit.llvm
 
 if '@BUILD_SHARED_LIBS@' == 'ON':
-    config.environment['LD_PRELOAD'] = "@ONNX_MLIR_LD_PRELOAD_onnx-mlir-opt@"
+    config.environment['LD_PRELOAD'] = r"@ONNX_MLIR_LD_PRELOAD_onnx-mlir-opt@"
 
-config.llvm_tools_dir = "@MLIR_TOOLS_DIR@"
-config.mlir_obj_root = "@LLVM_PROJ_BUILD@"
-config.mlir_tools_dir = "@MLIR_TOOLS_DIR@"
+config.llvm_tools_dir = r"@MLIR_TOOLS_DIR@"
+config.mlir_obj_root = r"@LLVM_PROJ_BUILD@"
+config.mlir_tools_dir = r"@MLIR_TOOLS_DIR@"
 config.suffixes = ['.mlir']
+config.lit_tools_dir = config.llvm_tools_dir
 
-config.onnx_mlir_tools_dir = "@ONNX_MLIR_TOOLS_DIR@"
-config.onnx_mlir_test_src_dir = "@ONNX_MLIR_LIT_TEST_SRC_DIR@"
-config.onnx_mlir_test_build_dir = "@ONNX_MLIR_LIT_TEST_BUILD_DIR@"
+config.onnx_mlir_tools_dir = r"@ONNX_MLIR_TOOLS_DIR@"
+config.onnx_mlir_test_src_dir = r"@ONNX_MLIR_LIT_TEST_SRC_DIR@"
+config.onnx_mlir_test_build_dir = r"@ONNX_MLIR_LIT_TEST_BUILD_DIR@"
 
 lit.llvm.initialize(lit_config, config)
 
 # Let the main config do the real work.
-lit_config.load_config(config, "@ONNX_MLIR_LIT_TEST_SRC_DIR@/lit.cfg.py")
+lit_config.load_config(config, r"@ONNX_MLIR_LIT_TEST_SRC_DIR@/lit.cfg.py")
diff --git a/utils/build-mlir.cmd b/utils/build-mlir.cmd
new file mode 100644
index 0000000..49edbfa
--- /dev/null
+++ b/utils/build-mlir.cmd
@@ -0,0 +1,16 @@
+set root_dir=%cd%
+md llvm-project\build
+cd llvm-project\build
+call cmake -G "Visual Studio 16 2019" -A x64 -T host=x64 ..\llvm ^
+   -DCMAKE_INSTALL_PREFIX="%root_dir%\llvm-project\build\install" ^
+   -DLLVM_ENABLE_PROJECTS=mlir ^
+   -DLLVM_BUILD_EXAMPLES=ON ^
+   -DLLVM_TARGETS_TO_BUILD="host" ^
+   -DCMAKE_BUILD_TYPE=Release ^
+   -DLLVM_ENABLE_ASSERTIONS=ON ^
+   -DLLVM_ENABLE_RTTI=ON ^
+   -DLLVM_ENABLE_ZLIB=OFF
+
+call cmake --build . --config Release --target -- /m
+call cmake --build . --config Release --target install
+call cmake --build . --config Release --target check-mlir
diff --git a/utils/build-mlir.sh b/utils/build-mlir.sh
new file mode 100644
index 0000000..6de6ea0
--- /dev/null
+++ b/utils/build-mlir.sh
@@ -0,0 +1,12 @@
+mkdir llvm-project/build
+cd llvm-project/build
+cmake -G Ninja ../llvm \
+   -DLLVM_ENABLE_PROJECTS=mlir \
+   -DLLVM_BUILD_EXAMPLES=ON \
+   -DLLVM_TARGETS_TO_BUILD="host" \
+   -DCMAKE_BUILD_TYPE=Release \
+   -DLLVM_ENABLE_ASSERTIONS=ON \
+   -DLLVM_ENABLE_RTTI=ON
+
+cmake --build . --target -- ${MAKEFLAGS}
+cmake --build . --target check-mlir
\ No newline at end of file
diff --git a/utils/clone-mlir.sh b/utils/clone-mlir.sh
new file mode 100644
index 0000000..b47c69c
--- /dev/null
+++ b/utils/clone-mlir.sh
@@ -0,0 +1,3 @@
+git clone https://github.com/llvm/llvm-project.git
+# Check out a specific branch that is known to work with ONNX MLIR.
+cd llvm-project && git checkout 07e462526d0cbae40b320e1a4307ce11e197fb0a && cd ..
diff --git a/utils/install-mlir.cmd b/utils/install-mlir.cmd
new file mode 100644
index 0000000..b13568d
--- /dev/null
+++ b/utils/install-mlir.cmd
@@ -0,0 +1,8 @@
+REM Clone the repo to the appropriate commit id
+copy  %~dp0\clone-mlir.sh %~dp0\clone-mlir.cmd
+call %~dp0\clone-mlir.cmd
+del  %~dp0\clone-mlir.cmd
+
+REM Build the repo
+call %~dp0\build-mlir.cmd
+
diff --git a/utils/install-mlir.sh b/utils/install-mlir.sh
index 12ad8c6..670200b 100755
--- a/utils/install-mlir.sh
+++ b/utils/install-mlir.sh
@@ -1,15 +1,2 @@
-git clone https://github.com/llvm/llvm-project.git
-# Check out a specific branch that is known to work with ONNX MLIR.
-cd llvm-project && git checkout 07e462526d0cbae40b320e1a4307ce11e197fb0a && cd ..
-mkdir llvm-project/build
-cd llvm-project/build
-cmake -G Ninja ../llvm \
-   -DLLVM_ENABLE_PROJECTS=mlir \
-   -DLLVM_BUILD_EXAMPLES=ON \
-   -DLLVM_TARGETS_TO_BUILD="host" \
-   -DCMAKE_BUILD_TYPE=Release \
-   -DLLVM_ENABLE_ASSERTIONS=ON \
-   -DLLVM_ENABLE_RTTI=ON
-
-cmake --build . --target -- ${MAKEFLAGS}
-cmake --build . --target check-mlir
\ No newline at end of file
+. $(dirname "${BASH_SOURCE[0]}")/clone-mlir.sh
+. $(dirname "${BASH_SOURCE[0]}")/build-mlir.sh
diff --git a/utils/install-onnx-mlir.cmd b/utils/install-onnx-mlir.cmd
new file mode 100644
index 0000000..29f73d4
--- /dev/null
+++ b/utils/install-onnx-mlir.cmd
@@ -0,0 +1,16 @@
+git clone --recursive https://github.com/onnx/onnx-mlir.git
+
+REM Export environment variables pointing to LLVM-Projects.
+set root_dir=%cd%
+set CURSES_LIB_PATH=%root_dir%/PDCurses
+set LLVM_PROJ_BUILD=%root_dir%/llvm-project/build
+set LLVM_PROJ_SRC=%root_dir%/llvm-project
+
+md onnx-mlir\build
+cd onnx-mlir\build
+call cmake -G "Visual Studio 16 2019" -A x64 -T host=x64 -DLLVM_EXTERNAL_LIT="%root_dir%\llvm-project\build\Release\bin\llvm-lit.py" -DCMAKE_BUILD_TYPE=Release ..
+call cmake --build . --config Release --target onnx-mlir -- /m
+
+REM Run FileCheck tests
+set LIT_OPTS=-v
+call cmake --build . --config Release --target check-onnx-lit