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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"],
)
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