Squashed 'libs/protobuf/' content from commit fcd3b9a85

git-subtree-dir: libs/protobuf
git-subtree-split: fcd3b9a85ef36e46643dc30176cea1a7ad62e02b

build_defs/cc_proto_blacklist_test.bzl

@@ -0,0 +1,38 @@
+"""Contains a unittest to verify that `cc_proto_library` does not generate code for blacklisted `.proto` sources (i.e. WKPs)."""
+
+load("@bazel_skylib//lib:unittest.bzl", "asserts", "unittest")
+
+def _cc_proto_blacklist_test_impl(ctx):
+    """Verifies that there are no C++ compile actions for Well-Known-Protos.
+
+    Args:
+      ctx: The rule context.
+
+    Returns: A (not further specified) sequence of providers.
+    """
+
+    env = unittest.begin(ctx)
+
+    for dep in ctx.attr.deps:
+        files = dep.files.to_list()
+        asserts.equals(
+            env,
+            [],
+            files,
+            "Expected that target '{}' does not provide files, got {}".format(
+                dep.label,
+                len(files),
+            ),
+        )
+
+    return unittest.end(env)
+
+cc_proto_blacklist_test = unittest.make(
+    impl = _cc_proto_blacklist_test_impl,
+    attrs = {
+        "deps": attr.label_list(
+            mandatory = True,
+            providers = [CcInfo],
+        ),
+    },
+)