1 files changed, 73 insertions, 0 deletions
diff --git a/pw_toolchain_bazel/cc_toolchain/private/utils.bzl b/pw_toolchain_bazel/cc_toolchain/private/utils.bzl
new file mode 100644
index 000000000..7030f2498
--- /dev/null
+++ b/pw_toolchain_bazel/cc_toolchain/private/utils.bzl
@@ -0,0 +1,73 @@
+# Copyright 2023 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.
+"""Private utilities and global variables."""
+
+load("@bazel_tools//tools/build_defs/cc:action_names.bzl", "ACTION_NAMES")
+load(
+    "@bazel_tools//tools/cpp:cc_toolchain_config_lib.bzl",
+    "FlagSetInfo",
+)
+load(
+    "//cc_toolchain/private:providers.bzl",
+    "ToolchainFeatureInfo",
+)
+
+# A potentially more complete set of these constants are available at
+# @rules_cc//cc:action_names.bzl, but it's not clear if they should be depended
+# on.
+ALL_ASM_ACTIONS = [
+    ACTION_NAMES.assemble,
+    ACTION_NAMES.preprocess_assemble,
+]
+ALL_C_COMPILER_ACTIONS = [
+    ACTION_NAMES.c_compile,
+    ACTION_NAMES.cc_flags_make_variable,
+]
+ALL_CPP_COMPILER_ACTIONS = [
+    ACTION_NAMES.cpp_compile,
+    ACTION_NAMES.cpp_header_parsing,
+]
+ALL_LINK_ACTIONS = [
+    ACTION_NAMES.cpp_link_executable,
+    ACTION_NAMES.cpp_link_dynamic_library,
+    ACTION_NAMES.cpp_link_nodeps_dynamic_library,
+]
+ALL_AR_ACTIONS = [
+    ACTION_NAMES.cpp_link_static_library,
+]
+
+ACTION_MAP = {
+    "aropts": ALL_AR_ACTIONS,
+    "asmopts": ALL_ASM_ACTIONS,
+    "copts": ALL_C_COMPILER_ACTIONS + ALL_CPP_COMPILER_ACTIONS,
+    "conlyopts": ALL_C_COMPILER_ACTIONS,
+    "cxxopts": ALL_CPP_COMPILER_ACTIONS,
+    "linkopts": ALL_LINK_ACTIONS,
+}
+
+def _check_dep_provides(ctx_label, dep, provider, what_provides):
+    if provider not in dep:
+        fail(
+            "{} listed as a dependency of {}, but it's not a {}".format(
+                dep.label,
+                ctx_label,
+                what_provides,
+            ),
+        )
+
+def check_deps(ctx):
+    for dep in ctx.attr.feature_deps:
+        _check_dep_provides(ctx.label, dep, ToolchainFeatureInfo, "pw_cc_toolchain_feature")
+    for dep in ctx.attr.action_config_flag_sets:
+        _check_dep_provides(ctx.label, dep, FlagSetInfo, "pw_cc_flag_set")