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#!/usr/bin/env python3
# Copyright 2022 The Pigweed Authors
#
# 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
#
# https://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.
""" An internal set of tools for creating embedded CC targets. """
load("@bazel_tools//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain")
def _print_platform_impl(_, ctx):
if hasattr(ctx.rule.attr, "constraint_values"):
for cv in ctx.rule.attr.constraint_values:
# buildifier: disable=print
print(str(ctx.rule.attr.name) + " specifies " + str(cv))
return []
print_platform = aspect(
implementation = _print_platform_impl,
attr_aspects = ["parents"],
doc = """
This is a little debug utility that traverses the platform inheritance
hierarchy and prints all the constraint values.
Example usage:
bazel build \
//pw_build/platforms:lm3s6965evb \
--aspects \
pw_build/bazel_internal/pigweed_internal.bzl%print_platform
""",
)
def compile_cc(
ctx,
srcs,
hdrs,
deps,
includes = [],
defines = [],
user_compile_flags = []):
"""Compiles a list C++ source files.
Args:
ctx: Rule context
srcs: List of C/C++ source files to compile
hdrs: List of C/C++ header files to compile with
deps: Dependencies to link with
includes: List of include paths
defines: List of preprocessor defines to use
user_compile_flags: Extra compiler flags to pass when compiling.
Returns:
A CcInfo provider.
"""
cc_toolchain = find_cpp_toolchain(ctx)
feature_configuration = cc_common.configure_features(
ctx = ctx,
cc_toolchain = cc_toolchain,
requested_features = ctx.features,
unsupported_features = ctx.disabled_features,
)
compilation_contexts = [dep[CcInfo].compilation_context for dep in deps]
compilation_context, compilation_outputs = cc_common.compile(
name = ctx.label.name,
actions = ctx.actions,
feature_configuration = feature_configuration,
cc_toolchain = cc_toolchain,
srcs = srcs,
includes = includes,
defines = defines,
public_hdrs = hdrs,
user_compile_flags = user_compile_flags,
compilation_contexts = compilation_contexts,
)
linking_contexts = [dep[CcInfo].linking_context for dep in deps]
linking_context, _ = cc_common.create_linking_context_from_compilation_outputs(
actions = ctx.actions,
feature_configuration = feature_configuration,
cc_toolchain = cc_toolchain,
compilation_outputs = compilation_outputs,
linking_contexts = linking_contexts,
disallow_dynamic_library = True,
name = ctx.label.name,
)
transitive_output_files = [dep[DefaultInfo].files for dep in deps]
output_files = depset(
compilation_outputs.pic_objects + compilation_outputs.objects,
transitive = transitive_output_files,
)
return [DefaultInfo(files = output_files), CcInfo(
compilation_context = compilation_context,
linking_context = linking_context,
)]
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