1*7594170eSAndroid Build Coastguard Worker# Copyright (C) 2022 The Android Open Source Project 2*7594170eSAndroid Build Coastguard Worker# 3*7594170eSAndroid Build Coastguard Worker# Licensed under the Apache License, Version 2.0 (the "License"); 4*7594170eSAndroid Build Coastguard Worker# you may not use this file except in compliance with the License. 5*7594170eSAndroid Build Coastguard Worker# You may obtain a copy of the License at 6*7594170eSAndroid Build Coastguard Worker# 7*7594170eSAndroid Build Coastguard Worker# http://www.apache.org/licenses/LICENSE-2.0 8*7594170eSAndroid Build Coastguard Worker# 9*7594170eSAndroid Build Coastguard Worker# Unless required by applicable law or agreed to in writing, software 10*7594170eSAndroid Build Coastguard Worker# distributed under the License is distributed on an "AS IS" BASIS, 11*7594170eSAndroid Build Coastguard Worker# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12*7594170eSAndroid Build Coastguard Worker# See the License for the specific language governing permissions and 13*7594170eSAndroid Build Coastguard Worker# limitations under the License. 14*7594170eSAndroid Build Coastguard Worker 15*7594170eSAndroid Build Coastguard Worker# Bazel still resolves toolchains even if targets are marked incompatible with 16*7594170eSAndroid Build Coastguard Worker# target_compatible_with, which can cause failures due to the toolchain not being found. 17*7594170eSAndroid Build Coastguard Worker# To work around this issue, some rules make the toolchain optional, but then in their 18*7594170eSAndroid Build Coastguard Worker# impl functions assert that it exists. This helper function can do that assertion. 19*7594170eSAndroid Build Coastguard Workerdef verify_toolchain_exists(ctx, toolchain): 20*7594170eSAndroid Build Coastguard Worker if not ctx.toolchains[toolchain]: 21*7594170eSAndroid Build Coastguard Worker # Mimic the bazel failure if this toolchain was mandatory 22*7594170eSAndroid Build Coastguard Worker fail("While resolving toolchains for target %s: No matching toolchains found for types %s.\nTo debug, rerun with --toolchain_resolution_debug='%s'" % 23*7594170eSAndroid Build Coastguard Worker (str(ctx.label), toolchain, toolchain)) 24