Attempt to switch everything to cmake

CMakeLists.txt

@@ -0,0 +1,101 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the license found in the
+# LICENSE file in the root directory of this source tree.
+
+cmake_minimum_required(VERSION 3.19)
+project(torchao_core CUDA CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+if(NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE Release)
+endif()
+
+# Find PyTorch package
+find_package(Torch REQUIRED)
+
+# Global compile definitions
+add_compile_definitions(Py_LIMITED_API=0x03090000)
+
+# Set compiler flags based on platform and build type
+if(MSVC)
+    if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+        add_compile_options(/Od /ZI /DEBUG)
+    else()
+        add_compile_options(/O2 /permissive-)
+    endif()
+else()
+    if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+        add_compile_options(-g -O0)
+        if(CMAKE_CUDA_COMPILER)
+            add_compile_options($<$<COMPILE_LANGUAGE:CUDA>:-g>)
+        endif()
+    else()
+        add_compile_options(-O3)
+        if(CMAKE_CUDA_COMPILER)
+            add_compile_options($<$<COMPILE_LANGUAGE:CUDA>:-O3>)
+        endif()
+    endif()
+
+    # Add color diagnostics for non-Windows builds
+    add_compile_options(-fdiagnostics-color=always)
+endif()
+
+# Include directories
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+
+# CUDA Setup
+if(CMAKE_CUDA_COMPILER)
+    enable_language(CUDA)
+    add_definitions(-DTORCH_CUDA_AVAILABLE)
+
+    # Set CUDA architectures if not already set
+    if(NOT DEFINED CMAKE_CUDA_ARCHITECTURES)
+        set(CMAKE_CUDA_ARCHITECTURES 70 75 80 86)
+    endif()
+
+    # Set CUDA flags
+    # Set CUDA architectures and TORCH_CUDA_ARCH_LIST
+    if(NOT DEFINED TORCH_CUDA_ARCH_LIST)
+        set(TORCH_CUDA_ARCH_LIST "7.0;7.5;8.0;8.6;9.0")
+    endif()
+
+    # CUTLASS support for non-Windows CUDA builds
+    if(NOT WIN32)
+        set(CUTLASS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/cutlass)
+        if(EXISTS ${CUTLASS_DIR})
+            add_definitions(-DTORCHAO_USE_CUTLASS)
+            include_directories(${CUTLASS_DIR}/include)
+            set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -DTORCHAO_USE_CUTLASS -I${CUTLASS_DIR}/include")
+        endif()
+    endif()
+endif()
+
+# Find source files
+file(GLOB_RECURSE CPP_SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/torchao/csrc/**/*.cpp")
+if(CMAKE_CUDA_COMPILER)
+    file(GLOB_RECURSE CUDA_SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/torchao/csrc/cuda/**/*.cu")
+endif()
+
+# Create the core library
+add_library(torchao_core SHARED
+    ${CPP_SOURCES}
+    ${CUDA_SOURCES}
+)
+
+target_link_libraries(torchao_core PRIVATE
+    ${TORCH_LIBRARIES}
+)
+
+# Set Python limited API version
+target_compile_definitions(torchao_core PRIVATE Py_LIMITED_API=0x03090000)
+
+# Installation
+install(TARGETS torchao_core
+    LIBRARY DESTINATION lib
+    RUNTIME DESTINATION lib
+)