Fix bazel version check in @cc_compatibility_proxy

 - Use new rule code only on bazel@head and 9.0.0 onwards
 - Critically, don't use the new rule code for 9.0.0-prerelease versions

Context: a1b0a7c#r165497333
PiperOrigin-RevId: 805284563
Change-Id: Idfcf203160d8a27f0287864fec596bc71e4d5d39

Author: hvadehra

.bazelci/presubmit.yml

@@ -88,6 +88,31 @@ tasks:
     build_targets: *build_targets
     test_targets: *test_targets
 
+  # Bazel@rolling
+  ubuntu2004_rolling:
+    name: Ubuntu 20.04 (Bazel rolling)
+    bazel: rolling
+    platform: ubuntu2004
+    build_targets: *build_targets
+    test_targets:
+    - "//:all"
+    - "//cc/..."
+    - "//examples/..."
+    - "//tests/..."
+    - "-//tests/rule_based_toolchain/tool_map:_duplicate_action_test_subject" # Intentionally broken rule.
+  macos_rolling:
+    name: MacOS (Bazel rolling)
+    bazel: rolling
+    platform: macos
+    build_targets: *build_targets
+    test_targets: *test_targets
+  windows_rolling:
+    name: Windows (Bazel rolling)
+    bazel: rolling
+    platform: windows
+    build_targets: *build_targets
+    test_targets: *test_targets
+
 # Bazel 6
   ubuntu2004_bazel_6:
     name: Ubuntu 20.04 (Bazel 6)

cc/extensions.bzl

@@ -14,6 +14,7 @@
 """Module extension for cc auto configuration."""
 
 load("@bazel_features//:features.bzl", "bazel_features")
+load("@bazel_features//private:util.bzl", _bazel_version_ge = "ge")
 load("//cc/private/toolchain:cc_configure.bzl", "cc_autoconf", "cc_autoconf_toolchains")
 
 def _cc_configure_extension_impl(ctx):
@@ -27,8 +28,7 @@ def _cc_configure_extension_impl(ctx):
 cc_configure_extension = module_extension(implementation = _cc_configure_extension_impl)
 
 def _compatibility_proxy_repo_impl(rctx):
-    bazel = native.bazel_version
-    if not bazel or bazel >= "9":
+    if _bazel_version_ge("9.0.0"):
         rctx.file(
             "BUILD",
             """