mirror of
https://github.com/bazelbuild/rules_cc
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b844e0c4b8
This will make sure the copybara export is reversible, which is needed for setting up copybara workflow for importing github PRs. RELNOTES: None. PiperOrigin-RevId: 238445502
82 lines
3 KiB
Python
82 lines
3 KiB
Python
# Copyright 2019 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Example showing how to create a rule that just compiles C sources."""
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load("@bazel_tools//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain")
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load("@bazel_tools//tools/build_defs/cc:action_names.bzl", "C_COMPILE_ACTION_NAME")
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MyCCompileInfo = provider(doc = "", fields = ["object"])
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DISABLED_FEATURES = [
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# "module_maps", # copybara-comment-this-out-please
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]
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def _my_c_compile_impl(ctx):
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cc_toolchain = find_cpp_toolchain(ctx)
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source_file = ctx.file.src
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output_file = ctx.actions.declare_file(ctx.label.name + ".o")
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feature_configuration = cc_common.configure_features(
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cc_toolchain = cc_toolchain,
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requested_features = ctx.features,
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unsupported_features = DISABLED_FEATURES + ctx.disabled_features,
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)
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c_compiler_path = cc_common.get_tool_for_action(
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feature_configuration = feature_configuration,
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action_name = C_COMPILE_ACTION_NAME,
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)
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c_compile_variables = cc_common.create_compile_variables(
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feature_configuration = feature_configuration,
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cc_toolchain = cc_toolchain,
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user_compile_flags = ctx.fragments.cpp.copts + ctx.fragments.cpp.conlyopts,
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source_file = source_file.path,
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output_file = output_file.path,
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)
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command_line = cc_common.get_memory_inefficient_command_line(
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feature_configuration = feature_configuration,
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action_name = C_COMPILE_ACTION_NAME,
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variables = c_compile_variables,
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)
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env = cc_common.get_environment_variables(
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feature_configuration = feature_configuration,
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action_name = C_COMPILE_ACTION_NAME,
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variables = c_compile_variables,
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)
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ctx.actions.run(
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executable = c_compiler_path,
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arguments = command_line,
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env = env,
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inputs = depset(
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items = [source_file],
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# TODO: Use CcToolchainInfo getters when available
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# See https://github.com/bazelbuild/bazel/issues/7427.
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transitive = [ctx.attr._cc_toolchain.files],
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),
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outputs = [output_file],
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)
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return [
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DefaultInfo(files = depset(items = [output_file])),
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MyCCompileInfo(object = output_file),
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]
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my_c_compile = rule(
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implementation = _my_c_compile_impl,
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attrs = {
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"src": attr.label(mandatory = True, allow_single_file = True),
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"_cc_toolchain": attr.label(default = Label("@bazel_tools//tools/cpp:current_cc_toolchain")),
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},
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fragments = ["cpp"],
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)
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