| # Copyright 2026 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. |
| """Rule to transition a dependency to a specific platform.""" |
| |
| def _transition_impl(settings, attr): |
| return {"//command_line_option:platforms": [attr.platform]} |
| |
| platform_transition = transition( |
| implementation = _transition_impl, |
| inputs = [], |
| outputs = ["//command_line_option:platforms"], |
| ) |
| |
| def _transitioned_dep_impl(ctx): |
| # Forward DefaultInfo from the actual target |
| return [ctx.attr.dep[DefaultInfo]] |
| |
| transitioned_dep = rule( |
| implementation = _transitioned_dep_impl, |
| attrs = { |
| "dep": attr.label(cfg = platform_transition), |
| "platform": attr.string(mandatory = True), |
| }, |
| ) |
