Automated rollback of commit 0640261.

*** Reason for rollback ***

Breaks cc_builtin_tests

*** Original change description ***

Copybara Merge: #257

BEGIN_PUBLIC
Copybara import of the project:

--
12a8bd5 by Fabian Meumertzheim <fabian@meumertzhe.im>:

Move static library validation helper to `ar_files`

It doesn't need to be staged for every compile or link action. The action that uses it stages `all_files`.

END_PUBLIC

***

PiperOrigin-RevId: 695300596
Change-Id: If10c95c1867716c82a09ad3acdfd479beedcc6c5

Author: comius

.bazelci/presubmit.yml

@@ -5,12 +5,14 @@ build_targets: &build_targets
   - "//examples/..."
   - "//tests/..."
   - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
+  - "-//tests/rule_based_toolchain/tool_map:_duplicate_action_test_subject" # Intentionally broken rule.
 test_targets: &test_targets
   - "//:all"
   - "//cc/..."
   - "//examples/..."
   - "//tests/..."
   - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
+  - "-//tests/rule_based_toolchain/tool_map:_duplicate_action_test_subject" # Intentionally broken rule.
 
 build_targets_bazel_6: &build_targets_bazel_6
   - "//:all"
@@ -20,6 +22,7 @@ build_targets_bazel_6: &build_targets_bazel_6
   - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
   - "-//tests/rule_based_toolchain/..." # proto.encode_text doesn't support None
   - "-//cc:optional_current_cc_toolchain" # Not supported in Bazel 6
+  - "-//tests/rule_based_toolchain/tool_map:_duplicate_action_test_subject" # Intentionally broken rule.
 test_targets_bazel_6: &test_targets_bazel_6
   - "//:all"
   - "//cc:all"
@@ -28,6 +31,7 @@ test_targets_bazel_6: &test_targets_bazel_6
   - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
   - "-//tests/rule_based_toolchain/..." # proto.encode_text doesn't support None
   - "-//cc:optional_current_cc_toolchain" # Not supported in Bazel 6
+  - "-//tests/rule_based_toolchain/tool_map:_duplicate_action_test_subject" # Intentionally broken rule.
 
 buildifier:
   version: latest
@@ -75,6 +79,7 @@ tasks:
       - "//tests/..."
       - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
       - "-//tests/system_library:system_library_test" # Fails because of repo setup
+      - "-//tests/rule_based_toolchain/tool_map:_duplicate_action_test_subject" # Intentionally broken rule.
   macos_head:
     name: MacOS (Bazel HEAD)
     bazel: last_green

cc/private/toolchain/BUILD.tpl

@@ -69,11 +69,6 @@ filegroup(
     srcs = glob(["extra_tools/**"], allow_empty = True) + [%{cc_compiler_deps}],
 )
 
-filegroup(
-    name = "ar_files",
-    srcs = [":compiler_deps"] + [%{ar_deps}],
-)
-
 # This is the entry point for --crosstool_top.  Toolchains are found
 # by lopping off the name of --crosstool_top and searching for
 # the "${CPU}" entry in the toolchains attribute.

cc/private/toolchain/unix_cc_configure.bzl

@@ -629,8 +629,9 @@ def configure_unix_toolchain(repository_ctx, cpu_value, overridden_tools):
                 ":builtin_include_directory_paths",
                 ":cc_wrapper",
                 ":deps_scanner_wrapper",
-            ]),
-            "%{ar_deps}": get_starlark_list([":validate_static_library"] if "validate_static_library" in tool_paths else []),
+            ] + (
+                [":validate_static_library"] if "validate_static_library" in tool_paths else []
+            )),
             "%{cc_toolchain_identifier}": cc_toolchain_identifier,
             "%{compile_flags}": get_starlark_list(
                 [