[python] Add an iree.build package with API/tooling for program building.

.gitignore

@@ -22,6 +22,8 @@
 build/
 build-*/
 Testing/
+# Include iree.build package
+!compiler/bindings/python/iree/compiler/build/
 
 # Bazel artifacts
 **/bazel-*

compiler/bindings/python/CMakeLists.txt

@@ -234,6 +234,37 @@ add_mlir_python_modules(IREECompilerPythonModules
   )
 
 
+################################################################################
+# iree.build package
+# This is a pure Python part of the namespace, not rooted under iree.compiler
+# like the above. It is only using the same build support for compatibility
+# with the existing development flow.
+# If the build system for Python code is ever redone, this can just be
+# source namespace in the project definition.
+################################################################################
+
+# The iree.build package.
+declare_mlir_python_sources(IREECompilerBuildPythonPackage
+ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/iree/build"
+SOURCES
+  __init__.py
+  __main__.py
+  executor.py
+  lang.py
+  main.py
+  net_actions.py
+  onnx_actions.py
+)
+
+add_mlir_python_modules(IREECompilerBuildPythonModules
+  ROOT_PREFIX "${_PYTHON_BUILD_PREFIX}/iree/build"
+  INSTALL_PREFIX "${_PYTHON_INSTALL_PREFIX}/iree/build"
+  DECLARED_SOURCES
+    IREECompilerBuildPythonPackage
+)
+
+add_dependencies(IREECompilerPythonModules IREECompilerBuildPythonModules)
+
 ################################################################################
 # Tools linked against the shared CAPI library
 ################################################################################

compiler/bindings/python/iree/build/__init__.py

@@ -0,0 +1,12 @@
+# Copyright 2024 The IREE Authors
+#
+# Licensed under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+import argparse
+
+from iree.build.lang import *
+from iree.build.main import *
+from iree.build.net_actions import *
+from iree.build.onnx_actions import *

compiler/bindings/python/iree/build/__main__.py

@@ -0,0 +1,11 @@
+# Copyright 2024 The IREE Authors
+#
+# Licensed under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+from .main import CliMain
+
+
+if __name__ == "__main__":
+    CliMain().run()