Support env for validate_static_library

Copybara Import from #590

BEGIN_PUBLIC
Support env for validate_static_library (#590)

We need a way to pass a flag corresponding to "is_darwin" to this action to do the equivalent of https://github.com/bazelbuild/rules_cc/blob/d81c50d0732241d07ea66e9f12982a145fb6d26d/cc/private/toolchain/unix_cc_configure.bzl#L430-L431

Passing via ENV is the easiest way. (If the implementation is a prebuilt binary instead of a shell script, it can't really be templated in a repo rule)

Closes #590
END_PUBLIC

COPYBARA_INTEGRATE_REVIEW=#590 from dzbarsky:zbarsky/validate b52c1bb
PiperOrigin-RevId: 883290004
Change-Id: I5eb22e3de2bf82c4c0edc80309ce37b24258df46

Author: dzbarsky

cc/private/rules_impl/cc_static_library.bzl

@@ -122,6 +122,12 @@ def _validate_static_library(*, name, actions, cc_toolchain, feature_configurati
     args.add(static_library)
     args.add(validation_output)
 
+    env = cc_common.get_environment_variables(
+        feature_configuration = feature_configuration,
+        action_name = ACTION_NAMES.validate_static_library,
+        variables = cc_common.empty_variables(),
+    )
+
     execution_requirements_keys = cc_common.get_execution_requirements(
         feature_configuration = feature_configuration,
         action_name = ACTION_NAMES.validate_static_library,
@@ -130,6 +136,7 @@ def _validate_static_library(*, name, actions, cc_toolchain, feature_configurati
     actions.run(
         executable = validator_path,
         arguments = [args],
+        env = env,
         execution_requirements = {k: "" for k in execution_requirements_keys},
         inputs = depset(
             direct = [static_library],

tests/validate_static_library_env/BUILD.bazel

@@ -0,0 +1,87 @@
+# Copyright 2026 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.
+
+load("//cc/toolchains:args.bzl", "cc_args")
+load("//cc/toolchains:tool.bzl", "cc_tool")
+load("//cc/toolchains:tool_map.bzl", "cc_tool_map")
+load("//cc/toolchains:toolchain.bzl", "cc_toolchain")
+load(":validate_static_library_env_test.bzl", "maybe_define_validate_static_library_env_targets")
+
+package(default_visibility = ["//visibility:private"])
+
+constraint_setting(name = "toolchain_selector")
+
+constraint_value(
+    name = "use_test_toolchain",
+    constraint_setting = ":toolchain_selector",
+)
+
+platform(
+    name = "test_platform",
+    constraint_values = [":use_test_toolchain"],
+)
+
+cc_tool(
+    name = "archive_tool",
+    src = "tools/archive_tool.sh",
+)
+
+cc_tool(
+    name = "validate_tool",
+    src = "tools/validate_tool.sh",
+)
+
+cc_tool_map(
+    name = "tool_map",
+    tools = {
+        "//cc/toolchains/actions:cpp_link_static_library": ":archive_tool",
+        "//cc/toolchains/actions:validate_static_library": ":validate_tool",
+    },
+)
+
+cc_args(
+    name = "archive_output_arg",
+    actions = ["//cc/toolchains/actions:cpp_link_static_library"],
+    args = ["{output_execpath}"],
+    format = {
+        "output_execpath": "//cc/toolchains/variables:output_execpath",
+    },
+    requires_not_none = "//cc/toolchains/variables:output_execpath",
+)
+
+cc_args(
+    name = "validate_static_library_env_args",
+    actions = ["//cc/toolchains/actions:validate_static_library"],
+    env = {
+        "VALIDATE_STATIC_LIBRARY_ENV": "expected",
+    },
+)
+
+cc_toolchain(
+    name = "test_cc_toolchain",
+    args = [
+        ":archive_output_arg",
+        ":validate_static_library_env_args",
+    ],
+    tool_map = ":tool_map",
+)
+
+toolchain(
+    name = "test_cc_toolchain_registration",
+    target_compatible_with = [":use_test_toolchain"],
+    toolchain = ":test_cc_toolchain",
+    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
+)
+
+maybe_define_validate_static_library_env_targets()

tests/validate_static_library_env/tools/archive_tool.sh

@@ -0,0 +1,57 @@
+# Copyright 2026 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.
+"""Analysis test for validate_static_library environment propagation."""
+
+load("@bazel_features//private:util.bzl", _bazel_version_ge = "ge")
+load("@rules_testing//lib:analysis_test.bzl", "analysis_test")
+load("@rules_testing//lib:util.bzl", "util")
+load("//cc:cc_static_library.bzl", "cc_static_library")
+
+def _validate_static_library_env_test_impl(env, target):
+    env.expect.that_target(target).action_named("ValidateStaticLibrary").env().contains_at_least({
+        "VALIDATE_STATIC_LIBRARY_ENV": "expected",
+    })
+
+def validate_static_library_env_test(name, target):
+    analysis_test(
+        name = name,
+        target = target,
+        impl = _validate_static_library_env_test_impl,
+        config_settings = {
+            "//command_line_option:extra_toolchains": [
+                Label("//tests/validate_static_library_env:test_cc_toolchain_registration"),
+            ],
+            "//command_line_option:platforms": [
+                Label("@rules_cc//tests/validate_static_library_env:test_platform"),
+            ],
+        },
+    )
+
+def maybe_define_validate_static_library_env_targets():
+    # cc_static_library is implemented in rules_cc only for Bazel 9+.
+    # For older Bazel versions, the native rule is used and does not wire
+    # env vars from rules_cc toolchains for ValidateStaticLibrary.
+    if not _bazel_version_ge("9.0.0-pre.20250911"):
+        return
+
+    util.helper_target(
+        cc_static_library,
+        name = "env_check_lib",
+        deps = [],
+    )
+
+    validate_static_library_env_test(
+        name = "validate_static_library_env_test",
+        target = ":env_check_lib",
+    )