cleanup

* remove swig_python.bzl
* sync cmake/README.md

bazel/swig_python.bzl

@@ -1,89 +0,0 @@
-# Copyright 2010-2025 Google LLC
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-""" Bazel rules for building swig files."""
-
-def _py_wrap_cc_impl(ctx):
-    srcs = ctx.files.srcs
-    if len(srcs) != 1:
-        fail("Exactly one SWIG source file label must be specified.", "srcs")
-    module_name = ctx.attr.module_name
-    src = ctx.files.srcs[0]
-    inputs = set([src])
-    inputs += ctx.files.i_includes
-    for dep in ctx.attr.deps:
-        inputs += dep.cc.transitive_headers
-    inputs += ctx.files._swiglib
-    inputs += ctx.files.toolchain_deps
-    swig_include_dirs = set(_get_repository_roots(ctx, inputs))
-    swig_include_dirs += sorted([f.dirname for f in ctx.files._swiglib])
-    args = [
-        "-c++",
-        "-python",
-        "-module",
-        module_name,
-        "-o",
-        ctx.outputs.cc_out.path,
-        "-outdir",
-        ctx.outputs.py_out.dirname,
-    ]
-    args += ["-l" + f.path for f in ctx.files.i_includes]
-    args += ["-I" + i for i in swig_include_dirs]
-    args.append(src.path)
-    outputs = [ctx.outputs.cc_out, ctx.outputs.py_out]
-    ctx.actions.run(
-        executable = ctx.executable._swig,
-        arguments = args,
-        inputs = list(inputs),
-        outputs = outputs,
-        mnemonic = "PythonSwig",
-        progress_message = "SWIGing " + src.path,
-    )
-    return [
-        DefaultInfo(files = depset(outputs)),
-    ]
-
-_py_wrap_cc = rule(
-    attrs = {
-        "srcs": attr.label_list(
-            mandatory = True,
-            allow_files = True,
-        ),
-        "swig_includes": attr.label_list(
-            allow_files = True,
-        ),
-        "deps": attr.label_list(
-            allow_files = True,
-            providers = ["cc"],
-        ),
-        "toolchain_deps": attr.label_list(
-            allow_files = True,
-        ),
-        "module_name": attr.string(mandatory = True),
-        "py_module_name": attr.string(mandatory = True),
-        "_swig": attr.label(
-            default = Label("@swig//:swig"),
-            executable = True,
-            cfg = "exec",
-        ),
-        "_swiglib": attr.label(
-            default = Label("@swig//:templates"),
-            allow_files = True,
-        ),
-    },
-    outputs = {
-        "cc_out": "%{module_name}.cc",
-        "py_out": "%{py_module_name}.py",
-    },
-    implementation = _py_wrap_cc_impl,
-)