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+# Copyright 2019 The Bazel Authors. All rights reserved.
+#
+# 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.
+
+"""Example showing how to create a rule that just compiles C sources."""
+
+load("@bazel_tools//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain", "use_cpp_toolchain")
+load("@rules_cc//cc:action_names.bzl", "C_COMPILE_ACTION_NAME")
+
+MyCCompileInfo = provider(doc = "", fields = ["object"])
+
+DISABLED_FEATURES = [
+ "module_maps", # # copybara-comment-this-out-please
+]
+
+def _my_c_compile_impl(ctx):
+ cc_toolchain = find_cpp_toolchain(ctx)
+ source_file = ctx.file.src
+ output_file = ctx.actions.declare_file(ctx.label.name + ".o")
+ feature_configuration = cc_common.configure_features(
+ ctx = ctx,
+ cc_toolchain = cc_toolchain,
+ requested_features = ctx.features,
+ unsupported_features = DISABLED_FEATURES + ctx.disabled_features,
+ )
+ c_compiler_path = cc_common.get_tool_for_action(
+ feature_configuration = feature_configuration,
+ action_name = C_COMPILE_ACTION_NAME,
+ )
+ c_compile_variables = cc_common.create_compile_variables(
+ feature_configuration = feature_configuration,
+ cc_toolchain = cc_toolchain,
+ user_compile_flags = ctx.fragments.cpp.copts + ctx.fragments.cpp.conlyopts,
+ source_file = source_file.path,
+ output_file = output_file.path,
+ )
+ command_line = cc_common.get_memory_inefficient_command_line(
+ feature_configuration = feature_configuration,
+ action_name = C_COMPILE_ACTION_NAME,
+ variables = c_compile_variables,
+ )
+ env = cc_common.get_environment_variables(
+ feature_configuration = feature_configuration,
+ action_name = C_COMPILE_ACTION_NAME,
+ variables = c_compile_variables,
+ )
+
+ ctx.actions.run(
+ executable = c_compiler_path,
+ arguments = command_line,
+ env = env,
+ inputs = depset(
+ [source_file],
+ transitive = [cc_toolchain.all_files],
+ ),
+ outputs = [output_file],
+ )
+ return [
+ DefaultInfo(files = depset([output_file])),
+ MyCCompileInfo(object = output_file),
+ ]
+
+my_c_compile = rule(
+ implementation = _my_c_compile_impl,
+ attrs = {
+ "src": attr.label(mandatory = True, allow_single_file = True),
+ "_cc_toolchain": attr.label(default = Label("@bazel_tools//tools/cpp:current_cc_toolchain")),
+ },
+ toolchains = use_cpp_toolchain(),
+ fragments = ["cpp"],
+)