Pass -no_warning_for_no_symbols flag to libtool on macos

Copybara Import from #503

BEGIN_PUBLIC
Pass -no_warning_for_no_symbols flag to libtool on macos (#503)

This was the default in Bazel before Starlarkification.

Closes #503
END_PUBLIC

COPYBARA_INTEGRATE_REVIEW=#503 from cerisier:no_warning_for_no_symbols cd9d7eb
PiperOrigin-RevId: 824916957
Change-Id: I5e43216e89bfd5daae1b70336440dd678f549df7

Author: cerisier

cc/private/toolchain/unix_cc_toolchain_config.bzl

@@ -1371,6 +1371,7 @@ def _impl(ctx):
                 flag_groups = [
                     flag_group(
                         flags = [
+                            "-no_warning_for_no_symbols",
                             "-static",
                             "-o",
                             "%{output_execpath}",

cc/toolchains/args/archiver_flags/BUILD

@@ -38,7 +38,10 @@ cc_args(
     name = "create_static_archive",
     actions = ["//cc/toolchains/actions:ar_actions"],
     args = select({
-        ":use_libtool_on_macos_setting": ["-static"],
+        ":use_libtool_on_macos_setting": [
+            "-no_warning_for_no_symbols",
+            "-static",
+        ],
         "//conditions:default": ["rcsD"],
     }),
 )

tests/rule_based_toolchain/legacy_features_as_args/goldens/macos/archiver_flags.textproto

@@ -2,6 +2,7 @@ enabled: false
 flag_sets {
   actions: "c++-link-static-library"
   flag_groups {
+    flags: "-no_warning_for_no_symbols"
     flags: "-static"
   }
 }