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diff --git a/ci/abi-dumps/google_cloud_cpp_workloadmanager.expected.abi.dump.gz b/ci/abi-dumps/google_cloud_cpp_workloadmanager.expected.abi.dump.gz
index 6911fccc91964..11539df33ac78 100644
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diff --git a/ci/abi-dumps/google_cloud_cpp_workstations.expected.abi.dump.gz b/ci/abi-dumps/google_cloud_cpp_workstations.expected.abi.dump.gz
index d2f824420ce0f..5361dbcf7b8df 100644
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diff --git a/ci/cloudbuild/dockerfiles/demo-debian-bookworm.Dockerfile b/ci/cloudbuild/dockerfiles/demo-debian-bookworm.Dockerfile
index d387fa6a682da..8f22a10902a66 100644
--- a/ci/cloudbuild/dockerfiles/demo-debian-bookworm.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/demo-debian-bookworm.Dockerfile
@@ -98,7 +98,7 @@ RUN curl -fsSL https://github.com/abseil/abseil-cpp/archive/20250814.2.tar.gz |
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
diff --git a/ci/cloudbuild/dockerfiles/demo-debian-bullseye.Dockerfile b/ci/cloudbuild/dockerfiles/demo-debian-bullseye.Dockerfile
index 99f05263085cf..bfc21511e9e1b 100644
--- a/ci/cloudbuild/dockerfiles/demo-debian-bullseye.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/demo-debian-bullseye.Dockerfile
@@ -90,7 +90,7 @@ RUN apt-get update && \
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
diff --git a/ci/cloudbuild/dockerfiles/demo-fedora.Dockerfile b/ci/cloudbuild/dockerfiles/demo-fedora.Dockerfile
index cba18620f983d..d7f1ec0fdd704 100644
--- a/ci/cloudbuild/dockerfiles/demo-fedora.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/demo-fedora.Dockerfile
@@ -88,7 +88,7 @@ RUN curl -fsSL https://github.com/curl/curl/releases/download/curl-8_7_1/curl-8.
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Release \
diff --git a/ci/cloudbuild/dockerfiles/demo-opensuse-leap.Dockerfile b/ci/cloudbuild/dockerfiles/demo-opensuse-leap.Dockerfile
index df91fcc713bb2..0a337c4a8b61a 100644
--- a/ci/cloudbuild/dockerfiles/demo-opensuse-leap.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/demo-opensuse-leap.Dockerfile
@@ -75,7 +75,7 @@ RUN curl -fsSL https://github.com/abseil/abseil-cpp/archive/20250814.2.tar.gz |
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
diff --git a/ci/cloudbuild/dockerfiles/demo-rockylinux-9.Dockerfile b/ci/cloudbuild/dockerfiles/demo-rockylinux-9.Dockerfile
index 3a0bb01a8ba1b..e0c9b952a7239 100644
--- a/ci/cloudbuild/dockerfiles/demo-rockylinux-9.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/demo-rockylinux-9.Dockerfile
@@ -116,7 +116,7 @@ RUN curl -fsSL https://github.com/abseil/abseil-cpp/archive/20250814.2.tar.gz |
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
diff --git a/ci/cloudbuild/dockerfiles/demo-ubuntu-24.04.Dockerfile b/ci/cloudbuild/dockerfiles/demo-ubuntu-24.04.Dockerfile
index c669b5614fd6b..e91e450bdf860 100644
--- a/ci/cloudbuild/dockerfiles/demo-ubuntu-24.04.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/demo-ubuntu-24.04.Dockerfile
@@ -100,7 +100,7 @@ RUN curl -fsSL https://github.com/abseil/abseil-cpp/archive/20250814.2.tar.gz |
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
diff --git a/ci/cloudbuild/dockerfiles/demo-ubuntu-jammy.Dockerfile b/ci/cloudbuild/dockerfiles/demo-ubuntu-jammy.Dockerfile
index 2e8278b2d3135..04a77a1cf90df 100644
--- a/ci/cloudbuild/dockerfiles/demo-ubuntu-jammy.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/demo-ubuntu-jammy.Dockerfile
@@ -74,7 +74,7 @@ RUN curl -fsSL https://github.com/abseil/abseil-cpp/archive/20250814.2.tar.gz |
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
diff --git a/ci/cloudbuild/dockerfiles/fedora-cmake-quickstart.Dockerfile b/ci/cloudbuild/dockerfiles/fedora-cmake-quickstart.Dockerfile
index 40f84b4a7ffae..b67590ba2c8b9 100644
--- a/ci/cloudbuild/dockerfiles/fedora-cmake-quickstart.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/fedora-cmake-quickstart.Dockerfile
@@ -146,7 +146,7 @@ RUN curl -fsSL https://github.com/nlohmann/json/archive/v3.11.3.tar.gz | \
     ldconfig && cd /var/tmp && rm -fr build
 
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Release \
diff --git a/ci/cloudbuild/dockerfiles/fedora-latest-cmake.Dockerfile b/ci/cloudbuild/dockerfiles/fedora-latest-cmake.Dockerfile
index c73462a758719..06e2700e7e880 100644
--- a/ci/cloudbuild/dockerfiles/fedora-latest-cmake.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/fedora-latest-cmake.Dockerfile
@@ -146,7 +146,7 @@ RUN curl -fsSL https://github.com/nlohmann/json/archive/v3.11.3.tar.gz | \
     ldconfig && cd /var/tmp && rm -fr build
 
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Release \
diff --git a/ci/cloudbuild/dockerfiles/fedora-latest-cxx20.Dockerfile b/ci/cloudbuild/dockerfiles/fedora-latest-cxx20.Dockerfile
index d9aedb3c1cb81..2a9a48a029cf1 100644
--- a/ci/cloudbuild/dockerfiles/fedora-latest-cxx20.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/fedora-latest-cxx20.Dockerfile
@@ -142,7 +142,7 @@ RUN curl -fsSL https://github.com/nlohmann/json/archive/v3.11.3.tar.gz | \
     cd /var/tmp && rm -fr build
 
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_CXX_STANDARD=20 \
diff --git a/ci/cloudbuild/dockerfiles/fedora-latest-publish-docs.Dockerfile b/ci/cloudbuild/dockerfiles/fedora-latest-publish-docs.Dockerfile
index 98336ac903aa0..6df8d83c7d1c0 100644
--- a/ci/cloudbuild/dockerfiles/fedora-latest-publish-docs.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/fedora-latest-publish-docs.Dockerfile
@@ -105,7 +105,7 @@ RUN curl -fsSL https://github.com/open-telemetry/opentelemetry-cpp/archive/v1.24
     ldconfig && cd /var/tmp && rm -fr build
 
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Release \
diff --git a/ci/cloudbuild/dockerfiles/ubuntu-20.04-install.Dockerfile b/ci/cloudbuild/dockerfiles/ubuntu-20.04-install.Dockerfile
index 618714e28bd77..a6d9cf626dc56 100644
--- a/ci/cloudbuild/dockerfiles/ubuntu-20.04-install.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/ubuntu-20.04-install.Dockerfile
@@ -128,7 +128,7 @@ RUN curl -fsSL https://github.com/nlohmann/json/archive/v3.11.3.tar.gz | \
 
 
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Release \
diff --git a/ci/cloudbuild/dockerfiles/ubuntu-22.04-install.Dockerfile b/ci/cloudbuild/dockerfiles/ubuntu-22.04-install.Dockerfile
index f5324eabffe12..f88c5be8f119c 100644
--- a/ci/cloudbuild/dockerfiles/ubuntu-22.04-install.Dockerfile
+++ b/ci/cloudbuild/dockerfiles/ubuntu-22.04-install.Dockerfile
@@ -127,7 +127,7 @@ RUN curl -fsSL https://github.com/nlohmann/json/archive/v3.11.3.tar.gz | \
 
 
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Release \
diff --git a/doc/packaging.md b/doc/packaging.md
index 89d291a1a3cb4..c0703d71b3511 100644
--- a/doc/packaging.md
+++ b/doc/packaging.md
@@ -304,7 +304,7 @@ sudo ldconfig && cd /var/tmp && rm -fr build
 
 ```bash
 mkdir -p $HOME/Downloads/protobuf && cd $HOME/Downloads/protobuf
-curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Release \
@@ -446,7 +446,7 @@ sudo ldconfig
 
 ```bash
 mkdir -p $HOME/Downloads/protobuf && cd $HOME/Downloads/protobuf
-curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
@@ -644,7 +644,7 @@ sudo ldconfig
 
 ```bash
 mkdir -p $HOME/Downloads/protobuf && cd $HOME/Downloads/protobuf
-curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
@@ -815,7 +815,7 @@ Google Cloud Platform proto files:
 
 ```bash
 mkdir -p $HOME/Downloads/protobuf && cd $HOME/Downloads/protobuf
-curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
@@ -1007,7 +1007,7 @@ sudo ldconfig
 
 ```bash
 mkdir -p $HOME/Downloads/protobuf && cd $HOME/Downloads/protobuf
-curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
@@ -1197,7 +1197,7 @@ to build from source:
 
 ```bash
 mkdir -p $HOME/Downloads/protobuf && cd $HOME/Downloads/protobuf
-curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
@@ -1400,7 +1400,7 @@ install Protobuf (and any downstream packages) from source.
 
 ```bash
 mkdir -p $HOME/Downloads/protobuf && cd $HOME/Downloads/protobuf
-curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \
diff --git a/generator/integration_tests/tests/golden_kitchen_sink_stub_test.cc b/generator/integration_tests/tests/golden_kitchen_sink_stub_test.cc
index c93af238b0817..eafe59b340030 100644
--- a/generator/integration_tests/tests/golden_kitchen_sink_stub_test.cc
+++ b/generator/integration_tests/tests/golden_kitchen_sink_stub_test.cc
@@ -783,7 +783,6 @@ class MockWriteObjectResponse
 
 TEST_F(GoldenKitchenSinkStubTest, StreamingWrite) {
   auto context = std::make_shared<grpc::ClientContext>();
-  Request request;
   EXPECT_CALL(*grpc_stub_, StreamingWriteRaw(context.get(), _))
       .WillOnce([](::grpc::ClientContext*, Response*) {
         auto stream = std::make_unique<MockWriteObjectResponse>();
diff --git a/generator/integration_tests/tests/golden_thing_admin_connection_test.cc b/generator/integration_tests/tests/golden_thing_admin_connection_test.cc
index ef2d6171bd9a3..799e21c9df843 100644
--- a/generator/integration_tests/tests/golden_thing_admin_connection_test.cc
+++ b/generator/integration_tests/tests/golden_thing_admin_connection_test.cc
@@ -97,7 +97,6 @@ TEST(GoldenThingAdminConnectionTest, ListDatabases) {
 
             ::google::test::admin::database::v1::ListDatabasesResponse page;
             page.set_next_page_token("page-1");
-            ::google::test::admin::database::v1::Database database;
             page.add_databases()->set_name("db-1");
             page.add_databases()->set_name("db-2");
             return make_status_or(page);
@@ -112,7 +111,6 @@ TEST(GoldenThingAdminConnectionTest, ListDatabases) {
 
             ::google::test::admin::database::v1::ListDatabasesResponse page;
             page.set_next_page_token("page-2");
-            ::google::test::admin::database::v1::Database database;
             page.add_databases()->set_name("db-3");
             page.add_databases()->set_name("db-4");
             return make_status_or(page);
@@ -127,7 +125,6 @@ TEST(GoldenThingAdminConnectionTest, ListDatabases) {
 
             ::google::test::admin::database::v1::ListDatabasesResponse page;
             page.clear_next_page_token();
-            ::google::test::admin::database::v1::Database database;
             page.add_databases()->set_name("db-5");
             return make_status_or(page);
           });
@@ -195,7 +192,7 @@ TEST(GoldenThingAdminConnectionTest, CreateDatabaseSuccess) {
         op.set_done(true);
         ::google::test::admin::database::v1::Database database;
         database.set_name("test-database");
-        op.mutable_response()->PackFrom(database);
+        (void)op.mutable_response()->PackFrom(database);
         return make_ready_future(make_status_or(op));
       });
   auto conn = CreateTestingConnection(std::move(mock));
@@ -248,7 +245,7 @@ TEST(GoldenThingAdminConnectionTest, CreateDatabaseStartAwait) {
   google::longrunning::Operation expected_operation;
   expected_operation.set_name("test-operation-name");
   google::test::admin::database::v1::CreateDatabaseMetadata metadata;
-  expected_operation.mutable_metadata()->PackFrom(metadata);
+  (void)expected_operation.mutable_metadata()->PackFrom(metadata);
 
   EXPECT_CALL(*mock, CreateDatabase(_, _, _)).WillOnce([&] {
     return make_status_or(expected_operation);
@@ -263,7 +260,7 @@ TEST(GoldenThingAdminConnectionTest, CreateDatabaseStartAwait) {
         op.set_done(true);
         ::google::test::admin::database::v1::Database database;
         database.set_name("test-database");
-        op.mutable_response()->PackFrom(database);
+        (void)op.mutable_response()->PackFrom(database);
         return make_ready_future(make_status_or(op));
       });
 
@@ -364,7 +361,7 @@ TEST(GoldenThingAdminConnectionTest, UpdateDatabaseDdlSuccess) {
         op.set_done(true);
         ::google::test::admin::database::v1::UpdateDatabaseDdlMetadata metadata;
         metadata.set_database("test-database");
-        op.mutable_metadata()->PackFrom(metadata);
+        (void)op.mutable_metadata()->PackFrom(metadata);
         return make_ready_future(make_status_or(op));
       });
   auto conn = CreateTestingConnection(std::move(mock));
@@ -421,7 +418,7 @@ TEST(GoldenThingAdminConnectionTest, UpdateDatabaseDdlStartAwait) {
   google::longrunning::Operation expected_operation;
   expected_operation.set_name("test-operation-name");
   google::test::admin::database::v1::UpdateDatabaseDdlMetadata metadata;
-  expected_operation.mutable_metadata()->PackFrom(metadata);
+  (void)expected_operation.mutable_metadata()->PackFrom(metadata);
 
   EXPECT_CALL(*mock, UpdateDatabaseDdl(_, _, _)).WillOnce([&] {
     return make_status_or(expected_operation);
@@ -436,7 +433,7 @@ TEST(GoldenThingAdminConnectionTest, UpdateDatabaseDdlStartAwait) {
         op.set_done(true);
         ::google::test::admin::database::v1::UpdateDatabaseDdlMetadata metadata;
         metadata.set_database("test-database");
-        op.mutable_metadata()->PackFrom(metadata);
+        (void)op.mutable_metadata()->PackFrom(metadata);
         return make_ready_future(make_status_or(op));
       });
 
@@ -787,7 +784,7 @@ TEST(GoldenThingAdminConnectionTest, CreateBackupSuccess) {
         op.set_done(true);
         ::google::test::admin::database::v1::Backup backup;
         backup.set_name("test-backup");
-        op.mutable_response()->PackFrom(backup);
+        (void)op.mutable_response()->PackFrom(backup);
         return make_ready_future(make_status_or(op));
       });
   auto conn = CreateTestingConnection(std::move(mock));
@@ -843,7 +840,7 @@ TEST(GoldenThingAdminConnectionTest, CreateBackupStartAwait) {
   google::longrunning::Operation expected_operation;
   expected_operation.set_name("test-operation-name");
   google::test::admin::database::v1::CreateBackupMetadata metadata;
-  expected_operation.mutable_metadata()->PackFrom(metadata);
+  (void)expected_operation.mutable_metadata()->PackFrom(metadata);
 
   EXPECT_CALL(*mock, CreateBackup(_, _, _)).WillOnce([&] {
     return make_status_or(expected_operation);
@@ -858,7 +855,7 @@ TEST(GoldenThingAdminConnectionTest, CreateBackupStartAwait) {
         op.set_done(true);
         ::google::test::admin::database::v1::Backup backup;
         backup.set_name("test-backup");
-        op.mutable_response()->PackFrom(backup);
+        (void)op.mutable_response()->PackFrom(backup);
         return make_ready_future(make_status_or(op));
       });
 
@@ -1155,7 +1152,7 @@ TEST(GoldenThingAdminConnectionTest, RestoreDatabaseSuccess) {
         op.set_done(true);
         ::google::test::admin::database::v1::Database database;
         database.set_name("test-database");
-        op.mutable_response()->PackFrom(database);
+        (void)op.mutable_response()->PackFrom(database);
         return make_ready_future(make_status_or(op));
       });
   auto conn = CreateTestingConnection(std::move(mock));
@@ -1213,7 +1210,7 @@ TEST(GoldenThingAdminConnectionTest, RestoreDatabaseStartAwait) {
   google::longrunning::Operation expected_operation;
   expected_operation.set_name("test-operation-name");
   google::test::admin::database::v1::RestoreDatabaseMetadata metadata;
-  expected_operation.mutable_metadata()->PackFrom(metadata);
+  (void)expected_operation.mutable_metadata()->PackFrom(metadata);
 
   EXPECT_CALL(*mock, RestoreDatabase(_, _, _)).WillOnce([&] {
     return make_status_or(expected_operation);
@@ -1228,7 +1225,7 @@ TEST(GoldenThingAdminConnectionTest, RestoreDatabaseStartAwait) {
         op.set_done(true);
         ::google::test::admin::database::v1::Database database;
         database.set_name("test-database");
-        op.mutable_response()->PackFrom(database);
+        (void)op.mutable_response()->PackFrom(database);
         return make_ready_future(make_status_or(op));
       });
 
diff --git a/generator/integration_tests/tests/golden_thing_admin_rest_connection_test.cc b/generator/integration_tests/tests/golden_thing_admin_rest_connection_test.cc
index 721ff35c2e208..e7082c43bcf6e 100644
--- a/generator/integration_tests/tests/golden_thing_admin_rest_connection_test.cc
+++ b/generator/integration_tests/tests/golden_thing_admin_rest_connection_test.cc
@@ -98,7 +98,6 @@ TEST(GoldenThingAdminConnectionTest, ListDatabases) {
 
             ::google::test::admin::database::v1::ListDatabasesResponse page;
             page.set_next_page_token("page-1");
-            ::google::test::admin::database::v1::Database database;
             page.add_databases()->set_name("db-1");
             page.add_databases()->set_name("db-2");
             return make_status_or(page);
@@ -113,7 +112,6 @@ TEST(GoldenThingAdminConnectionTest, ListDatabases) {
 
             ::google::test::admin::database::v1::ListDatabasesResponse page;
             page.set_next_page_token("page-2");
-            ::google::test::admin::database::v1::Database database;
             page.add_databases()->set_name("db-3");
             page.add_databases()->set_name("db-4");
             return make_status_or(page);
@@ -128,7 +126,6 @@ TEST(GoldenThingAdminConnectionTest, ListDatabases) {
 
             ::google::test::admin::database::v1::ListDatabasesResponse page;
             page.clear_next_page_token();
-            ::google::test::admin::database::v1::Database database;
             page.add_databases()->set_name("db-5");
             return make_status_or(page);
           });
@@ -201,7 +198,7 @@ TEST(GoldenThingAdminConnectionTest, CreateDatabaseSuccess) {
         op.set_done(true);
         ::google::test::admin::database::v1::Database database;
         database.set_name("test-database");
-        op.mutable_response()->PackFrom(database);
+        (void)op.mutable_response()->PackFrom(database);
         return make_ready_future(make_status_or(op));
       });
   auto conn = CreateTestingConnection(std::move(mock));
@@ -260,7 +257,7 @@ TEST(GoldenThingAdminConnectionTest, CreateDatabaseStartAwait) {
   google::longrunning::Operation expected_operation;
   expected_operation.set_name("test-operation-name");
   google::test::admin::database::v1::CreateDatabaseMetadata metadata;
-  expected_operation.mutable_metadata()->PackFrom(metadata);
+  (void)expected_operation.mutable_metadata()->PackFrom(metadata);
 
   EXPECT_CALL(*mock, CreateDatabase(_, _, _)).WillOnce([&] {
     return make_status_or(expected_operation);
@@ -275,7 +272,7 @@ TEST(GoldenThingAdminConnectionTest, CreateDatabaseStartAwait) {
         op.set_done(true);
         ::google::test::admin::database::v1::Database database;
         database.set_name("test-database");
-        op.mutable_response()->PackFrom(database);
+        (void)op.mutable_response()->PackFrom(database);
         return make_ready_future(make_status_or(op));
       });
 
@@ -381,7 +378,7 @@ TEST(GoldenThingAdminConnectionTest, UpdateDatabaseDdlSuccess) {
         op.set_done(true);
         ::google::test::admin::database::v1::UpdateDatabaseDdlMetadata metadata;
         metadata.set_database("test-database");
-        op.mutable_metadata()->PackFrom(metadata);
+        (void)op.mutable_metadata()->PackFrom(metadata);
         return make_ready_future(make_status_or(op));
       });
   auto conn = CreateTestingConnection(std::move(mock));
@@ -444,7 +441,7 @@ TEST(GoldenThingAdminRestConnectionTest, UpdateDatabaseDdlStartAwait) {
   google::longrunning::Operation expected_operation;
   expected_operation.set_name("test-operation-name");
   google::test::admin::database::v1::UpdateDatabaseDdlMetadata metadata;
-  expected_operation.mutable_metadata()->PackFrom(metadata);
+  (void)expected_operation.mutable_metadata()->PackFrom(metadata);
 
   EXPECT_CALL(*mock, UpdateDatabaseDdl(_, _, _)).WillOnce([&] {
     return make_status_or(expected_operation);
@@ -459,7 +456,7 @@ TEST(GoldenThingAdminRestConnectionTest, UpdateDatabaseDdlStartAwait) {
         op.set_done(true);
         ::google::test::admin::database::v1::UpdateDatabaseDdlMetadata metadata;
         metadata.set_database("test-database");
-        op.mutable_metadata()->PackFrom(metadata);
+        (void)op.mutable_metadata()->PackFrom(metadata);
         return make_ready_future(make_status_or(op));
       });
 
@@ -815,7 +812,7 @@ TEST(GoldenThingAdminConnectionTest, CreateBackupSuccess) {
         op.set_done(true);
         ::google::test::admin::database::v1::Backup backup;
         backup.set_name("test-backup");
-        op.mutable_response()->PackFrom(backup);
+        (void)op.mutable_response()->PackFrom(backup);
         return make_ready_future(make_status_or(op));
       });
   auto conn = CreateTestingConnection(std::move(mock));
@@ -877,7 +874,7 @@ TEST(GoldenThingAdminConnectionTest, CreateBackupStartAwait) {
   google::longrunning::Operation expected_operation;
   expected_operation.set_name("test-operation-name");
   google::test::admin::database::v1::CreateBackupMetadata metadata;
-  expected_operation.mutable_metadata()->PackFrom(metadata);
+  (void)expected_operation.mutable_metadata()->PackFrom(metadata);
 
   EXPECT_CALL(*mock, CreateBackup(_, _, _)).WillOnce([&] {
     return make_status_or(expected_operation);
@@ -892,7 +889,7 @@ TEST(GoldenThingAdminConnectionTest, CreateBackupStartAwait) {
         op.set_done(true);
         ::google::test::admin::database::v1::Backup backup;
         backup.set_name("test-backup");
-        op.mutable_response()->PackFrom(backup);
+        (void)op.mutable_response()->PackFrom(backup);
         return make_ready_future(make_status_or(op));
       });
 
@@ -1194,7 +1191,7 @@ TEST(GoldenThingAdminConnectionTest, RestoreDatabaseSuccess) {
         op.set_done(true);
         ::google::test::admin::database::v1::Database database;
         database.set_name("test-database");
-        op.mutable_response()->PackFrom(database);
+        (void)op.mutable_response()->PackFrom(database);
         return make_ready_future(make_status_or(op));
       });
   auto conn = CreateTestingConnection(std::move(mock));
@@ -1254,7 +1251,7 @@ TEST(GoldenThingAdminConnectionTest, RestoreDatabaseStartAwait) {
   google::longrunning::Operation expected_operation;
   expected_operation.set_name("test-operation-name");
   google::test::admin::database::v1::RestoreDatabaseMetadata metadata;
-  expected_operation.mutable_metadata()->PackFrom(metadata);
+  (void)expected_operation.mutable_metadata()->PackFrom(metadata);
 
   EXPECT_CALL(*mock, RestoreDatabase(_, _, _)).WillOnce([&] {
     return make_status_or(expected_operation);
@@ -1269,7 +1266,7 @@ TEST(GoldenThingAdminConnectionTest, RestoreDatabaseStartAwait) {
         op.set_done(true);
         ::google::test::admin::database::v1::Database database;
         database.set_name("test-database");
-        op.mutable_response()->PackFrom(database);
+        (void)op.mutable_response()->PackFrom(database);
         return make_ready_future(make_status_or(op));
       });
 
diff --git a/generator/integration_tests/tests/request_id_connection_impl_test.cc b/generator/integration_tests/tests/request_id_connection_impl_test.cc
index bf65a4fcc78cb..caad6d32bde25 100644
--- a/generator/integration_tests/tests/request_id_connection_impl_test.cc
+++ b/generator/integration_tests/tests/request_id_connection_impl_test.cc
@@ -191,7 +191,7 @@ TEST(RequestIdTest, Lro) {
   EXPECT_CALL(*mock, AsyncGetOperation).WillOnce([] {
     google::longrunning::Operation result;
     result.set_done(true);
-    result.mutable_response()->PackFrom(Foo{});
+    (void)result.mutable_response()->PackFrom(Foo{});
     return make_ready_future(make_status_or(std::move(result)));
   });
 
@@ -216,7 +216,7 @@ TEST(RequestIdTest, LroExplicit) {
   EXPECT_CALL(*mock, AsyncGetOperation).WillOnce([] {
     google::longrunning::Operation result;
     result.set_done(true);
-    result.mutable_response()->PackFrom(Foo{});
+    (void)result.mutable_response()->PackFrom(Foo{});
     return make_ready_future(make_status_or(std::move(result)));
   });
 
diff --git a/generator/integration_tests/tests/request_id_tracing_stub_test.cc b/generator/integration_tests/tests/request_id_tracing_stub_test.cc
index fb4f9fbaa1562..46033600ea904 100644
--- a/generator/integration_tests/tests/request_id_tracing_stub_test.cc
+++ b/generator/integration_tests/tests/request_id_tracing_stub_test.cc
@@ -169,7 +169,7 @@ TEST(RequestIdTracingStubTest, Lro) {
         EXPECT_TRUE(ThereIsAnActiveSpan());
         google::longrunning::Operation result;
         result.set_done(true);
-        result.mutable_response()->PackFrom(Foo{});
+        (void)result.mutable_response()->PackFrom(Foo{});
         return make_ready_future(make_status_or(std::move(result)));
       });
 
diff --git a/generator/internal/descriptor_utils.cc b/generator/internal/descriptor_utils.cc
index 7d54fa58b0b26..b2d4cf9a9fc56 100644
--- a/generator/internal/descriptor_utils.cc
+++ b/generator/internal/descriptor_utils.cc
@@ -345,7 +345,7 @@ std::string FormattedCommentsForParameter(
   google::protobuf::FieldDescriptor const* parameter_descriptor =
       input_type->FindFieldByName(parameter);
   google::protobuf::SourceLocation loc;
-  parameter_descriptor->GetSourceLocation(&loc);
+  (void)parameter_descriptor->GetSourceLocation(&loc);
   auto comment = EscapePrinterDelimiter(ChompByValue(loc.leading_comments));
   // This is an arbitrary threshold. The intent is to simplify the generator
   // code for corner cases. In the few cases where the documentation of a field
@@ -897,7 +897,7 @@ std::map<std::string, std::string> ParseIdempotencyOverrides(
         absl::StrSplit(idempotency_override, absl::ByChar(':'));
     auto idempotency =
         ServiceConfiguration::IdempotencyOverride::NON_IDEMPOTENT;
-    ServiceConfiguration::IdempotencyOverride::Idempotency_Parse(
+    (void)ServiceConfiguration::IdempotencyOverride::Idempotency_Parse(
         override_splits.second, &idempotency);
     parsed_overrides[override_splits.first] =
         (idempotency == ServiceConfiguration::IdempotencyOverride::IDEMPOTENT
diff --git a/generator/internal/doxygen.cc b/generator/internal/doxygen.cc
index 4066e429b85e3..986f6721d7b0c 100644
--- a/generator/internal/doxygen.cc
+++ b/generator/internal/doxygen.cc
@@ -23,7 +23,7 @@ namespace generator_internal {
 std::string FormatDoxygenLink(
     google::protobuf::Descriptor const& message_type) {
   google::protobuf::SourceLocation loc;
-  message_type.GetSourceLocation(&loc);
+  (void)message_type.GetSourceLocation(&loc);
   std::string output_type_proto_file_name{message_type.file()->name()};
   return absl::StrCat(
       "@googleapis_link{", ProtoNameToCppName(message_type.full_name()), ",",
diff --git a/generator/internal/format_method_comments.cc b/generator/internal/format_method_comments.cc
index 8271493137361..799861e5799b1 100644
--- a/generator/internal/format_method_comments.cc
+++ b/generator/internal/format_method_comments.cc
@@ -53,7 +53,7 @@ auto constexpr kDeprecationComment = R"""( @deprecated This RPC is deprecated.
 
 ProtoDefinitionLocation Location(google::protobuf::Descriptor const& d) {
   google::protobuf::SourceLocation loc;
-  d.GetSourceLocation(&loc);
+  (void)d.GetSourceLocation(&loc);
   return ProtoDefinitionLocation{std::string{d.file()->name()},
                                  loc.start_line + 1};
 }
diff --git a/generator/internal/pagination_test.cc b/generator/internal/pagination_test.cc
index 35ae79e707b95..c15f1ab439eaa 100644
--- a/generator/internal/pagination_test.cc
+++ b/generator/internal/pagination_test.cc
@@ -605,10 +605,12 @@ class BigQueryTestFixture
  public:
   void AddDependenciesToDatabase() {
     FileDescriptorProto proto_file;
-    google::protobuf::TextFormat::ParseFromString(kProtobufText, &proto_file);
+    (void)google::protobuf::TextFormat::ParseFromString(kProtobufText,
+                                                        &proto_file);
     simple_db_.Add(proto_file);
     FileDescriptorProto bq_file;
-    google::protobuf::TextFormat::ParseFromString(kBigQueryText, &bq_file);
+    (void)google::protobuf::TextFormat::ParseFromString(kBigQueryText,
+                                                        &bq_file);
     simple_db_.Add(bq_file);
   }
 
diff --git a/generator/internal/resolve_comment_references.cc b/generator/internal/resolve_comment_references.cc
index b7aa53c158dbe..2e3f7045fd151 100644
--- a/generator/internal/resolve_comment_references.cc
+++ b/generator/internal/resolve_comment_references.cc
@@ -28,7 +28,7 @@ std::optional<std::pair<std::string, ProtoDefinitionLocation>> GetLocation(
     Descriptor const* d) {
   if (d == nullptr) return std::nullopt;
   google::protobuf::SourceLocation loc;
-  d->GetSourceLocation(&loc);
+  (void)d->GetSourceLocation(&loc);
   return std::make_pair(std::string{d->full_name()},
                         ProtoDefinitionLocation{std::string{d->file()->name()},
                                                 loc.start_line + 1});
diff --git a/generator/internal/resolve_method_return.cc b/generator/internal/resolve_method_return.cc
index e2bb73566f485..387f574f0c1d7 100644
--- a/generator/internal/resolve_method_return.cc
+++ b/generator/internal/resolve_method_return.cc
@@ -27,7 +27,7 @@ namespace {
 
 ProtoDefinitionLocation Location(google::protobuf::Descriptor const& d) {
   google::protobuf::SourceLocation loc;
-  d.GetSourceLocation(&loc);
+  (void)d.GetSourceLocation(&loc);
   return ProtoDefinitionLocation{std::string{d.file()->name()},
                                  loc.start_line + 1};
 }
diff --git a/generator/internal/service_code_generator.cc b/generator/internal/service_code_generator.cc
index 2f498b65a23a5..b7b1dad62bf38 100644
--- a/generator/internal/service_code_generator.cc
+++ b/generator/internal/service_code_generator.cc
@@ -95,7 +95,7 @@ ServiceCodeGenerator::ServiceCodeGenerator(
 ServiceCodeGenerator::ServiceConfiguration::EndpointLocationStyle
 ServiceCodeGenerator::EndpointLocationStyle() const {
   auto endpoint_location_style = ServiceConfiguration::LOCATION_INDEPENDENT;
-  ServiceConfiguration::EndpointLocationStyle_Parse(
+  (void)ServiceConfiguration::EndpointLocationStyle_Parse(
       vars("endpoint_location_style"), &endpoint_location_style);
   return endpoint_location_style;
 }
diff --git a/google/cloud/bigquerycontrol/integration_tests/job_integration_test.cc b/google/cloud/bigquerycontrol/integration_tests/job_integration_test.cc
index be062026831a1..7f68c5a28eac1 100644
--- a/google/cloud/bigquerycontrol/integration_tests/job_integration_test.cc
+++ b/google/cloud/bigquerycontrol/integration_tests/job_integration_test.cc
@@ -66,7 +66,6 @@ TEST_F(BigQueryJobIntegrationTest, JobCRUD) {
   query.set_parameter_mode("NAMED");
 
   // Specify value for named integer parameter: @minimum_year
-  bigquery_proto::QueryParameter minimum_year_param;
   auto constexpr kMinimumYearParam = R"pb(
     name: "minimum_year"
     parameter_type { type: "INT64" }
diff --git a/google/cloud/bigtable/mutations_test.cc b/google/cloud/bigtable/mutations_test.cc
index e131ad0d6ced0..eae5739c2ca90 100644
--- a/google/cloud/bigtable/mutations_test.cc
+++ b/google/cloud/bigtable/mutations_test.cc
@@ -184,14 +184,14 @@ TEST(MutationsTest, FailedMutation) {
   google::rpc::RetryInfo retry;
   retry.mutable_retry_delay()->set_seconds(900);
   retry.mutable_retry_delay()->set_nanos(0);
-  status.add_details()->PackFrom(retry);
+  (void)status.add_details()->PackFrom(retry);
   google::rpc::DebugInfo debug_info;
   debug_info.add_stack_entries("foo()");
   debug_info.add_stack_entries("bar()");
   debug_info.add_stack_entries("main()");
   debug_info.set_detail("just a test");
-  status.add_details()->PackFrom(retry);
-  status.add_details()->PackFrom(debug_info);
+  (void)status.add_details()->PackFrom(retry);
+  (void)status.add_details()->PackFrom(debug_info);
 
   FailedMutation fm(std::move(status), 27);
   EXPECT_EQ(google::cloud::StatusCode::kFailedPrecondition, fm.status().code());
diff --git a/google/cloud/bigtable/tests/instance_admin_emulator.cc b/google/cloud/bigtable/tests/instance_admin_emulator.cc
index 40bde479f2cb8..b2db97cd216e6 100644
--- a/google/cloud/bigtable/tests/instance_admin_emulator.cc
+++ b/google/cloud/bigtable/tests/instance_admin_emulator.cc
@@ -40,7 +40,7 @@ class InstanceAdminEmulator final
       google::longrunning::Operation* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto constexpr kMaxInstanceIdLength = 33;
@@ -64,7 +64,7 @@ class InstanceAdminEmulator final
       response->set_name("create-instance/" + name);
       response->set_done(true);
       auto contents = std::make_unique<google::protobuf::Any>();
-      contents->PackFrom(stored_instance);
+      (void)contents->PackFrom(stored_instance);
       response->set_allocated_response(contents.release());
 
       // Add cluster into clusters_
@@ -85,7 +85,7 @@ class InstanceAdminEmulator final
                            btadmin::Instance* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto i = instances_.find(request->name());
@@ -101,7 +101,7 @@ class InstanceAdminEmulator final
       btadmin::ListInstancesResponse* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     std::string prefix = request->parent() + "/instances/";
@@ -118,7 +118,7 @@ class InstanceAdminEmulator final
                               btadmin::Instance*) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     return grpc::Status(grpc::StatusCode::UNIMPLEMENTED, "not implemented");
@@ -130,7 +130,7 @@ class InstanceAdminEmulator final
       google::longrunning::Operation* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     std::string name = request->instance().name();
@@ -170,7 +170,7 @@ class InstanceAdminEmulator final
     response->set_name("update-instance/" + name);
     response->set_done(true);
     auto contents = std::make_unique<google::protobuf::Any>();
-    contents->PackFrom(stored_instance);
+    (void)contents->PackFrom(stored_instance);
     response->set_allocated_response(contents.release());
     return grpc::Status::OK;
   }
@@ -180,7 +180,7 @@ class InstanceAdminEmulator final
                               google::protobuf::Empty*) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto i = instances_.find(request->name());
@@ -203,7 +203,7 @@ class InstanceAdminEmulator final
       google::longrunning::Operation* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto constexpr kMaxClusterIdLength = 30;
@@ -225,7 +225,7 @@ class InstanceAdminEmulator final
       response->set_name("create-cluster/" + name);
       response->set_done(true);
       auto contents = std::make_unique<google::protobuf::Any>();
-      contents->PackFrom(stored_cluster);
+      (void)contents->PackFrom(stored_cluster);
       response->set_allocated_response(contents.release());
       return grpc::Status::OK;
     }
@@ -237,7 +237,7 @@ class InstanceAdminEmulator final
                           btadmin::Cluster* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto i = clusters_.find(request->name());
@@ -253,7 +253,7 @@ class InstanceAdminEmulator final
                             btadmin::ListClustersResponse* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     // We should only return the clusters for the project embedded in the
@@ -294,7 +294,7 @@ class InstanceAdminEmulator final
       google::longrunning::Operation* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     std::string name = request->name();
@@ -307,7 +307,7 @@ class InstanceAdminEmulator final
     response->set_name("update-cluster/" + name);
     response->set_done(true);
     auto contents = std::make_unique<google::protobuf::Any>();
-    contents->PackFrom(stored_cluster);
+    (void)contents->PackFrom(stored_cluster);
     response->set_allocated_response(contents.release());
     return grpc::Status::OK;
   }
@@ -317,7 +317,7 @@ class InstanceAdminEmulator final
                              google::protobuf::Empty*) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto i = clusters_.find(request->name());
@@ -333,7 +333,7 @@ class InstanceAdminEmulator final
                                 btadmin::AppProfile* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto constexpr kMaxAppProfileIdLength = 50;
@@ -364,7 +364,7 @@ class InstanceAdminEmulator final
                              btadmin::AppProfile* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto i = app_profiles_.find(request->name());
@@ -380,7 +380,7 @@ class InstanceAdminEmulator final
       btadmin::ListAppProfilesResponse* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto const& parent = request->parent();
@@ -398,7 +398,7 @@ class InstanceAdminEmulator final
       google::longrunning::Operation* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     std::string name = request->app_profile().name();
@@ -427,7 +427,7 @@ class InstanceAdminEmulator final
     response->set_name("update-app-profile/" + name);
     response->set_done(true);
     auto contents = std::make_unique<google::protobuf::Any>();
-    contents->PackFrom(stored_app_profile);
+    (void)contents->PackFrom(stored_app_profile);
     response->set_allocated_response(contents.release());
     return grpc::Status::OK;
   }
@@ -437,7 +437,7 @@ class InstanceAdminEmulator final
                                 google::protobuf::Empty*) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto i = app_profiles_.find(request->name());
@@ -458,7 +458,7 @@ class InstanceAdminEmulator final
                             google::iam::v1::Policy* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto it = policies_.find(request->resource());
@@ -476,7 +476,7 @@ class InstanceAdminEmulator final
                             google::iam::v1::Policy* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto policy = request->policy();
@@ -492,7 +492,7 @@ class InstanceAdminEmulator final
       google::iam::v1::TestIamPermissionsResponse* response) override {
     std::unique_lock<std::mutex> lk(mu_);
     std::string request_text;
-    google::protobuf::TextFormat::PrintToString(*request, &request_text);
+    (void)google::protobuf::TextFormat::PrintToString(*request, &request_text);
     std::cout << __func__ << "() request=" << request_text << "\n";
 
     auto it = instances_.find(request->resource());
diff --git a/google/cloud/grpc_error_delegate_test.cc b/google/cloud/grpc_error_delegate_test.cc
index 1b96d428b363e..04812fcaffed7 100644
--- a/google/cloud/grpc_error_delegate_test.cc
+++ b/google/cloud/grpc_error_delegate_test.cc
@@ -54,8 +54,8 @@ std::string MakeErrorDetails(grpc::StatusCode code, std::string message,
   *retry_info_proto.mutable_retry_delay() =
       internal::ToDurationProto(retry_info.retry_delay());
 
-  proto.add_details()->PackFrom(error_info_proto);
-  proto.add_details()->PackFrom(retry_info_proto);
+  (void)proto.add_details()->PackFrom(error_info_proto);
+  (void)proto.add_details()->PackFrom(retry_info_proto);
   return MakeErrorDetails(proto);
 }
 
diff --git a/google/cloud/internal/async_long_running_operation_test.cc b/google/cloud/internal/async_long_running_operation_test.cc
index 98a689a38e44c..1fdfd923ccc64 100644
--- a/google/cloud/internal/async_long_running_operation_test.cc
+++ b/google/cloud/internal/async_long_running_operation_test.cc
@@ -137,7 +137,7 @@ TEST(AsyncLongRunningTest, RequestPollThenSuccessMetadata) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation done_op = starting_op;
   done_op.set_done(true);
-  done_op.mutable_metadata()->PackFrom(expected);
+  (void)done_op.mutable_metadata()->PackFrom(expected);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -190,7 +190,7 @@ TEST(AsyncLongRunningTest, RequestPollThenSuccessResponse) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation done_op = starting_op;
   done_op.set_done(true);
-  done_op.mutable_response()->PackFrom(expected);
+  (void)done_op.mutable_response()->PackFrom(expected);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -315,7 +315,7 @@ TEST(AsyncLongRunningTest, AwaitPollThenSuccessMetadata) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation done_op = starting_op;
   done_op.set_done(true);
-  done_op.mutable_metadata()->PackFrom(expected);
+  (void)done_op.mutable_metadata()->PackFrom(expected);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -356,7 +356,7 @@ TEST(AsyncLongRunningTest, AwaitPollThenSuccessResponse) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation done_op = starting_op;
   done_op.set_done(true);
-  done_op.mutable_response()->PackFrom(expected);
+  (void)done_op.mutable_response()->PackFrom(expected);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
diff --git a/google/cloud/internal/async_polling_loop_test.cc b/google/cloud/internal/async_polling_loop_test.cc
index 2ca520c9efb99..68d5381105230 100644
--- a/google/cloud/internal/async_polling_loop_test.cc
+++ b/google/cloud/internal/async_polling_loop_test.cc
@@ -102,7 +102,7 @@ TEST(AsyncPollingLoopTest, ImmediateSuccess) {
   google::longrunning::Operation op;
   op.set_name("test-op-name");
   op.set_done(true);
-  op.mutable_metadata()->PackFrom(expected);
+  (void)op.mutable_metadata()->PackFrom(expected);
 
   auto mock = std::make_shared<MockStub>();
   EXPECT_CALL(*mock, AsyncGetOperation).Times(0);
@@ -183,7 +183,7 @@ TEST(AsyncPollingLoopTest, PollThenSuccess) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation expected = starting_op;
   expected.set_done(true);
-  expected.mutable_metadata()->PackFrom(response);
+  (void)expected.mutable_metadata()->PackFrom(response);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -253,7 +253,7 @@ TEST(AsyncPollingLoopTest, PollThenEventualSuccess) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation expected = starting_op;
   expected.set_done(true);
-  expected.mutable_metadata()->PackFrom(response);
+  (void)expected.mutable_metadata()->PackFrom(response);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -309,7 +309,7 @@ TEST(AsyncPollingLoopTest, PollThenExhaustedPollingPolicy) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation expected = starting_op;
   expected.set_done(true);
-  expected.mutable_metadata()->PackFrom(response);
+  (void)expected.mutable_metadata()->PackFrom(response);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -357,7 +357,7 @@ TEST(AsyncPollingLoopTest, PollThenExhaustedPollingPolicyWithFailure) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation expected = starting_op;
   expected.set_done(true);
-  expected.mutable_metadata()->PackFrom(response);
+  (void)expected.mutable_metadata()->PackFrom(response);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -404,7 +404,7 @@ TEST(AsyncPollingLoopTest, PollLifetime) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation expected = starting_op;
   expected.set_done(true);
-  expected.mutable_metadata()->PackFrom(response);
+  (void)expected.mutable_metadata()->PackFrom(response);
 
   AsyncSequencer<TimerType> timer_sequencer;
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
diff --git a/google/cloud/internal/async_rest_long_running_operation_test.cc b/google/cloud/internal/async_rest_long_running_operation_test.cc
index 1a91521dd118c..8bf985c668670 100644
--- a/google/cloud/internal/async_rest_long_running_operation_test.cc
+++ b/google/cloud/internal/async_rest_long_running_operation_test.cc
@@ -133,7 +133,7 @@ TEST(AsyncLongRunningTest, RequestPollThenSuccessMetadata) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation done_op = starting_op;
   done_op.set_done(true);
-  done_op.mutable_metadata()->PackFrom(expected);
+  (void)done_op.mutable_metadata()->PackFrom(expected);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -188,7 +188,7 @@ TEST(AsyncLongRunningTest, RequestPollThenSuccessResponse) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation done_op = starting_op;
   done_op.set_done(true);
-  done_op.mutable_response()->PackFrom(expected);
+  (void)done_op.mutable_response()->PackFrom(expected);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -319,7 +319,7 @@ TEST(AsyncLongRunningTest, AwaitPollThenSuccessMetadata) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation done_op = starting_op;
   done_op.set_done(true);
-  done_op.mutable_metadata()->PackFrom(expected);
+  (void)done_op.mutable_metadata()->PackFrom(expected);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -362,7 +362,7 @@ TEST(AsyncLongRunningTest, AwaitPollThenSuccessResponse) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation done_op = starting_op;
   done_op.set_done(true);
-  done_op.mutable_response()->PackFrom(expected);
+  (void)done_op.mutable_response()->PackFrom(expected);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
diff --git a/google/cloud/internal/async_rest_polling_loop_test.cc b/google/cloud/internal/async_rest_polling_loop_test.cc
index b382b427bf8be..6c03915e9b5ab 100644
--- a/google/cloud/internal/async_rest_polling_loop_test.cc
+++ b/google/cloud/internal/async_rest_polling_loop_test.cc
@@ -102,7 +102,7 @@ TEST(AsyncRestPollingLoopTest, ImmediateSuccess) {
   google::longrunning::Operation op;
   op.set_name("test-op-name");
   op.set_done(true);
-  op.mutable_metadata()->PackFrom(expected);
+  (void)op.mutable_metadata()->PackFrom(expected);
 
   auto mock = std::make_shared<MockStub>();
   EXPECT_CALL(*mock, AsyncGetOperation).Times(0);
@@ -187,7 +187,7 @@ TEST(AsyncRestPollingLoopTest, PollThenSuccess) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation expected = starting_op;
   expected.set_done(true);
-  expected.mutable_metadata()->PackFrom(response);
+  (void)expected.mutable_metadata()->PackFrom(response);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -262,7 +262,7 @@ TEST(AsyncRestPollingLoopTest, PollThenEventualSuccess) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation expected = starting_op;
   expected.set_done(true);
-  expected.mutable_metadata()->PackFrom(response);
+  (void)expected.mutable_metadata()->PackFrom(response);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -323,7 +323,7 @@ TEST(AsyncRestPollingLoopTest, PollThenExhaustedPollingPolicy) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation expected = starting_op;
   expected.set_done(true);
-  expected.mutable_metadata()->PackFrom(response);
+  (void)expected.mutable_metadata()->PackFrom(response);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -371,7 +371,7 @@ TEST(AsyncRestPollingLoopTest, PollThenExhaustedPollingPolicyWithFailure) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation expected = starting_op;
   expected.set_done(true);
-  expected.mutable_metadata()->PackFrom(response);
+  (void)expected.mutable_metadata()->PackFrom(response);
 
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
   EXPECT_CALL(*mock_cq, MakeRelativeTimer)
@@ -418,7 +418,7 @@ TEST(AsyncRestPollingLoopTest, PollLifetime) {
   starting_op.set_name("test-op-name");
   google::longrunning::Operation expected = starting_op;
   expected.set_done(true);
-  expected.mutable_metadata()->PackFrom(response);
+  (void)expected.mutable_metadata()->PackFrom(response);
 
   AsyncSequencer<TimerType> timer_sequencer;
   auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
diff --git a/google/cloud/internal/debug_string_protobuf.cc b/google/cloud/internal/debug_string_protobuf.cc
index e652d2458bbd5..66c8a3284cf1e 100644
--- a/google/cloud/internal/debug_string_protobuf.cc
+++ b/google/cloud/internal/debug_string_protobuf.cc
@@ -79,7 +79,7 @@ std::string DebugString(google::protobuf::Message const& m,
                            new DurationMessagePrinter);
   p.RegisterMessagePrinter(google::protobuf::Timestamp::descriptor(),
                            new TimestampMessagePrinter);
-  p.PrintToString(m, &str);
+  (void)p.PrintToString(m, &str);
   return absl::StrCat(m.GetTypeName(), " {",
                       (options.single_line_mode() ? " " : "\n"), str, "}");
 }
diff --git a/google/cloud/internal/debug_string_status_test.cc b/google/cloud/internal/debug_string_status_test.cc
index 008605e063309..45d74affb10b3 100644
--- a/google/cloud/internal/debug_string_status_test.cc
+++ b/google/cloud/internal/debug_string_status_test.cc
@@ -36,7 +36,7 @@ TEST(DebugStringStatus, Basic) {
   auto proto = google::rpc::Status();
   proto.set_code(static_cast<std::int32_t>(StatusCode::kInvalidArgument));
   proto.set_message("oh noes!");
-  proto.add_details()->PackFrom(detail);
+  (void)proto.add_details()->PackFrom(detail);
 
   auto const status = MakeStatusFromRpcError(proto);
   auto const actual = DebugString(status, TracingOptions());
@@ -55,7 +55,7 @@ TEST(DebugStringStatus, WithDetails) {
   google::rpc::Status proto;
   proto.set_code(grpc::StatusCode::NOT_FOUND);
   proto.set_message("Resource not found");
-  proto.add_details()->PackFrom(resource_info);
+  (void)proto.add_details()->PackFrom(resource_info);
 
   TracingOptions tracing_options;
   auto s = DebugString(MakeStatusFromRpcError(proto), tracing_options);
diff --git a/google/cloud/internal/extract_long_running_result.cc b/google/cloud/internal/extract_long_running_result.cc
index f0ac481306931..68ba988492ce5 100644
--- a/google/cloud/internal/extract_long_running_result.cc
+++ b/google/cloud/internal/extract_long_running_result.cc
@@ -44,7 +44,11 @@ Status ExtractOperationResultMetadataImpl(
                                        op->name(),
                                    GCP_ERROR_INFO());
   }
-  any.UnpackTo(&result);
+  if (!any.UnpackTo(&result)) {
+    return internal::InternalError(
+        location + "() failed to unpack operation metadata, name=" + op->name(),
+        GCP_ERROR_INFO());
+  }
   return Status{};
 }
 
@@ -71,7 +75,11 @@ Status ExtractOperationResultResponseImpl(
                                        op->name(),
                                    GCP_ERROR_INFO());
   }
-  any.UnpackTo(&result);
+  if (!any.UnpackTo(&result)) {
+    return internal::InternalError(
+        location + "() failed to unpack operation response, name=" + op->name(),
+        GCP_ERROR_INFO());
+  }
   return Status{};
 }
 
diff --git a/google/cloud/internal/extract_long_running_result_test.cc b/google/cloud/internal/extract_long_running_result_test.cc
index 7eb810a85416e..04812e7ba7eeb 100644
--- a/google/cloud/internal/extract_long_running_result_test.cc
+++ b/google/cloud/internal/extract_long_running_result_test.cc
@@ -16,6 +16,7 @@
 #include "google/cloud/testing_util/is_proto_equal.h"
 #include "google/cloud/testing_util/mock_completion_queue_impl.h"
 #include "google/cloud/testing_util/status_matchers.h"
+#include "absl/strings/str_cat.h"
 #include "google/protobuf/timestamp.pb.h"
 #include <gmock/gmock.h>
 
@@ -37,7 +38,7 @@ TEST(ExtractLongRunningResultTest, MetadataDoneWithSuccess) {
   expected.set_seconds(123456);
   google::longrunning::Operation op;
   op.set_done(true);
-  op.mutable_metadata()->PackFrom(expected);
+  (void)op.mutable_metadata()->PackFrom(expected);
   auto const actual =
       ExtractLongRunningResultMetadata<Response>(op, "test-function");
   ASSERT_STATUS_OK(actual);
@@ -66,7 +67,7 @@ TEST(ExtractLongRunningResultTest, MetadataDoneWithoutResult) {
 TEST(ExtractLongRunningResultTest, MetadataDoneWithInvalidContent) {
   google::longrunning::Operation op;
   op.set_done(true);
-  op.mutable_metadata()->PackFrom(google::protobuf::Empty{});
+  (void)op.mutable_metadata()->PackFrom(google::protobuf::Empty{});
   auto const actual =
       ExtractLongRunningResultMetadata<Response>(op, "test-function");
   EXPECT_THAT(actual, StatusIs(StatusCode::kInternal,
@@ -74,6 +75,21 @@ TEST(ExtractLongRunningResultTest, MetadataDoneWithInvalidContent) {
                                      HasSubstr("invalid metadata type"))));
 }
 
+TEST(ExtractLongRunningResultTest, MetadataDoneWithUnpackError) {
+  google::longrunning::Operation op;
+  op.set_done(true);
+  op.mutable_metadata()->set_type_url(absl::StrCat(
+      "type.googleapis.com/", Response::descriptor()->full_name()));
+  op.mutable_metadata()->set_value("invalid protobuf payload");
+  auto const actual =
+      ExtractLongRunningResultMetadata<Response>(op, "test-function");
+  EXPECT_THAT(
+      actual,
+      StatusIs(StatusCode::kInternal,
+               AllOf(HasSubstr("test-function"),
+                     HasSubstr("failed to unpack operation metadata"))));
+}
+
 TEST(ExtractLongRunningResultTest, MetadataError) {
   auto const expected = Status{StatusCode::kPermissionDenied, "uh-oh"};
   auto const actual =
@@ -87,7 +103,7 @@ TEST(ExtractLongRunningResultTest, ResponseDoneWithSuccess) {
   expected.set_seconds(123456);
   google::longrunning::Operation op;
   op.set_done(true);
-  op.mutable_response()->PackFrom(expected);
+  (void)op.mutable_response()->PackFrom(expected);
   auto const actual =
       ExtractLongRunningResultResponse<Response>(op, "test-function");
   ASSERT_STATUS_OK(actual);
@@ -116,7 +132,7 @@ TEST(ExtractLongRunningResultTest, ResponseDoneWithoutResult) {
 TEST(ExtractLongRunningResultTest, ResponseDoneWithInvalidContent) {
   google::longrunning::Operation op;
   op.set_done(true);
-  op.mutable_response()->PackFrom(google::protobuf::Empty{});
+  (void)op.mutable_response()->PackFrom(google::protobuf::Empty{});
   auto const actual =
       ExtractLongRunningResultResponse<Response>(op, "test-function");
   EXPECT_THAT(actual, StatusIs(StatusCode::kInternal,
@@ -124,6 +140,21 @@ TEST(ExtractLongRunningResultTest, ResponseDoneWithInvalidContent) {
                                      HasSubstr("invalid response type"))));
 }
 
+TEST(ExtractLongRunningResultTest, ResponseDoneWithUnpackError) {
+  google::longrunning::Operation op;
+  op.set_done(true);
+  op.mutable_response()->set_type_url(absl::StrCat(
+      "type.googleapis.com/", Response::descriptor()->full_name()));
+  op.mutable_response()->set_value("invalid protobuf payload");
+  auto const actual =
+      ExtractLongRunningResultResponse<Response>(op, "test-function");
+  EXPECT_THAT(
+      actual,
+      StatusIs(StatusCode::kInternal,
+               AllOf(HasSubstr("test-function"),
+                     HasSubstr("failed to unpack operation response"))));
+}
+
 TEST(ExtractLongRunningResultTest, ResponseError) {
   auto const expected = Status{StatusCode::kPermissionDenied, "uh-oh"};
   auto const actual =
diff --git a/google/cloud/pubsub/message.cc b/google/cloud/pubsub/message.cc
index 577beedc0bd17..4b3dfd25f7188 100644
--- a/google/cloud/pubsub/message.cc
+++ b/google/cloud/pubsub/message.cc
@@ -87,7 +87,7 @@ std::ostream& operator<<(std::ostream& os, Message const& rhs) {
   p.SetSingleLineMode(true);
   p.SetTruncateStringFieldLongerThan(kMaximumPayloadBytes);
   std::string text;
-  p.PrintToString(rhs.proto_, &text);
+  (void)p.PrintToString(rhs.proto_, &text);
   return os << text;
 }
 
diff --git a/google/cloud/pubsub/samples/samples.cc b/google/cloud/pubsub/samples/samples.cc
index a71b29fd4b510..94d500be6dcb3 100644
--- a/google/cloud/pubsub/samples/samples.cc
+++ b/google/cloud/pubsub/samples/samples.cc
@@ -237,7 +237,7 @@ google::cloud::future<google::cloud::Status> SubscribeProtobufRecords(
     auto session = subscriber.Subscribe(
         [](pubsub::Message const& m, pubsub::AckHandler h) {
           google::cloud::pubsub::samples::State state;
-          state.ParseFromString(std::string{m.data()});
+          (void)state.ParseFromString(std::string{m.data()});
           std::cout << "Message contents: " << state.DebugString() << "\n";
           std::move(h).ack();
         });
diff --git a/google/cloud/spanner/admin/integration_tests/backup_integration_test.cc b/google/cloud/spanner/admin/integration_tests/backup_integration_test.cc
index 14085985883d5..e88209a53f4c7 100644
--- a/google/cloud/spanner/admin/integration_tests/backup_integration_test.cc
+++ b/google/cloud/spanner/admin/integration_tests/backup_integration_test.cc
@@ -158,7 +158,7 @@ TEST_F(BackupIntegrationTest, BackupRestore) {
        database_admin_client_.ListBackupOperations(lreq)) {
     if (!operation) break;
     google::spanner::admin::database::v1::CreateBackupMetadata metadata;
-    operation->metadata().UnpackTo(&metadata);
+    (void)operation->metadata().UnpackTo(&metadata);
     db_names.push_back(metadata.database());
   }
   if (Emulator()) {
@@ -229,7 +229,7 @@ TEST_F(BackupIntegrationTest, BackupRestore) {
          database_admin_client_.ListDatabaseOperations(dreq)) {
       if (!operation) break;
       google::spanner::admin::database::v1::OptimizeRestoredDatabaseMetadata md;
-      operation->metadata().UnpackTo(&md);
+      (void)operation->metadata().UnpackTo(&md);
       restored_db_names.push_back(md.name());
     }
     EXPECT_LE(1, std::count(restored_db_names.begin(), restored_db_names.end(),
diff --git a/google/cloud/spanner/benchmarks/multiple_rows_cpu_benchmark.cc b/google/cloud/spanner/benchmarks/multiple_rows_cpu_benchmark.cc
index edfd09d82e1e6..92c881035e736 100644
--- a/google/cloud/spanner/benchmarks/multiple_rows_cpu_benchmark.cc
+++ b/google/cloud/spanner/benchmarks/multiple_rows_cpu_benchmark.cc
@@ -588,7 +588,6 @@ class ReadExperiment : public BasicExperiment<Traits> {
       *request.mutable_key_set() = spanner_internal::ToProto(key);
 
       int row_count = 0;
-      google::spanner::v1::PartialResultSet result;
       std::vector<google::protobuf::Value> row;
       row.resize(columns.size());
       auto stream = stub->StreamingRead(std::make_shared<grpc::ClientContext>(),
@@ -736,7 +735,6 @@ class SelectExperiment : public BasicExperiment<Traits> {
           std::move(end_type_value.second);
 
       int row_count = 0;
-      google::spanner::v1::PartialResultSet result;
       std::vector<google::protobuf::Value> row;
       row.resize(ExperimentImpl<Traits>::kColumnCount);
       auto stream =
diff --git a/google/cloud/spanner/internal/connection_impl_test.cc b/google/cloud/spanner/internal/connection_impl_test.cc
index 9a94725998a7f..c3c372013a05d 100644
--- a/google/cloud/spanner/internal/connection_impl_test.cc
+++ b/google/cloud/spanner/internal/connection_impl_test.cc
@@ -2945,7 +2945,6 @@ TEST(ConnectionImplTest, MultiplexedPrecommitUpdated) {
           }
         )pb"};
 
-    google::spanner::v1::PartialResultSet result_set;
     EXPECT_CALL(*mock, StreamingRead)
         .WillOnce(Return(ByMove(MakeReader<PartialResultSet>({response}))));
 
diff --git a/google/cloud/spanner/proto_message.h b/google/cloud/spanner/proto_message.h
index 2c75dc5388973..3c6d1dd46b15e 100644
--- a/google/cloud/spanner/proto_message.h
+++ b/google/cloud/spanner/proto_message.h
@@ -56,7 +56,7 @@ class ProtoMessage {
 
   /// Implicit construction from the message type.
   // NOLINTNEXTLINE(google-explicit-constructor)
-  ProtoMessage(M const& m) { m.SerializeToString(&serialized_message_); }
+  ProtoMessage(M const& m) { (void)m.SerializeToString(&serialized_message_); }
 
   /// Explicit construction from wire format.
   explicit ProtoMessage(std::string serialized_message)
@@ -65,7 +65,7 @@ class ProtoMessage {
   /// Explicit conversion to the message type.
   explicit operator message_type() const {
     message_type m;
-    m.ParseFromString(serialized_message_);
+    (void)m.ParseFromString(serialized_message_);
     return m;
   }
 
diff --git a/google/cloud/spanner/samples/samples.cc b/google/cloud/spanner/samples/samples.cc
index f198b32e695b8..25f076bf103e9 100644
--- a/google/cloud/spanner/samples/samples.cc
+++ b/google/cloud/spanner/samples/samples.cc
@@ -217,7 +217,7 @@ void ListInstanceConfigOperations(
        client.ListInstanceConfigOperations(project.FullName())) {
     if (!operation) throw std::move(operation).status();
     google::spanner::admin::instance::v1::CreateInstanceConfigMetadata metadata;
-    operation->metadata().UnpackTo(&metadata);
+    (void)operation->metadata().UnpackTo(&metadata);
     std::cout << "CreateInstanceConfig metadata is:\n"
               << metadata.DebugString();
   }
@@ -229,7 +229,7 @@ void ListInstanceConfigOperations(
        client.ListInstanceConfigOperations(project.FullName())) {
     if (!operation) throw std::move(operation).status();
     google::spanner::admin::instance::v1::UpdateInstanceConfigMetadata metadata;
-    operation->metadata().UnpackTo(&metadata);
+    (void)operation->metadata().UnpackTo(&metadata);
     std::cout << "UpdateInstanceConfig metadata is:\n"
               << metadata.DebugString();
   }
@@ -1849,7 +1849,7 @@ void ListBackupOperations(
   for (auto& operation : client.ListBackupOperations(request)) {
     if (!operation) throw std::move(operation).status();
     google::spanner::admin::database::v1::CreateBackupMetadata metadata;
-    operation->metadata().UnpackTo(&metadata);
+    (void)operation->metadata().UnpackTo(&metadata);
     std::cout << "Backup " << metadata.name() << " of database "
               << metadata.database() << " is "
               << metadata.progress().progress_percent() << "% complete.\n";
@@ -1861,7 +1861,7 @@ void ListBackupOperations(
   for (auto& operation : client.ListBackupOperations(request)) {
     if (!operation) throw std::move(operation).status();
     google::spanner::admin::database::v1::CopyBackupMetadata metadata;
-    operation->metadata().UnpackTo(&metadata);
+    (void)operation->metadata().UnpackTo(&metadata);
     std::cout << "Copy " << metadata.name() << " of backup "
               << metadata.source_backup() << " is "
               << metadata.progress().progress_percent() << "% complete.\n";
@@ -1894,7 +1894,7 @@ void ListDatabaseOperations(
     if (!operation) throw std::move(operation).status();
     google::spanner::admin::database::v1::OptimizeRestoredDatabaseMetadata
         metadata;
-    operation->metadata().UnpackTo(&metadata);
+    (void)operation->metadata().UnpackTo(&metadata);
     std::cout << "Database " << metadata.name() << " restored from backup is "
               << metadata.progress().progress_percent() << "% optimized.\n";
   }
@@ -4371,7 +4371,7 @@ void AddProtoTypeColumns(
       .GetMetadata()
       .descriptor->file()
       ->CopyTo(fds.add_file());
-  fds.SerializeToString(request.mutable_proto_descriptors());
+  (void)fds.SerializeToString(request.mutable_proto_descriptors());
   request.add_statements(R"""(
       CREATE PROTO BUNDLE (
           google.cloud.spanner.testing.SingerInfo,
diff --git a/google/cloud/spanner/testing/database_integration_test.cc b/google/cloud/spanner/testing/database_integration_test.cc
index c2f1184ce0bad..74ad48b464e7f 100644
--- a/google/cloud/spanner/testing/database_integration_test.cc
+++ b/google/cloud/spanner/testing/database_integration_test.cc
@@ -126,7 +126,7 @@ void DatabaseIntegrationTest::SetUpTestSuite() {
         .GetMetadata()
         .descriptor->file()
         ->CopyTo(fds.add_file());
-    fds.SerializeToString(request.mutable_proto_descriptors());
+    (void)fds.SerializeToString(request.mutable_proto_descriptors());
     request.add_extra_statements(R"sql(
         CREATE PROTO BUNDLE (
           google.cloud.spanner.testing.SingerInfo,
diff --git a/google/cloud/spanner/testing/status_utils.cc b/google/cloud/spanner/testing/status_utils.cc
index 4ee7904e9caed..b55281268151e 100644
--- a/google/cloud/spanner/testing/status_utils.cc
+++ b/google/cloud/spanner/testing/status_utils.cc
@@ -37,7 +37,7 @@ grpc::Status SessionNotFoundRpcError(std::string name) {
   google::rpc::Status proto;
   proto.set_code(grpc::StatusCode::NOT_FOUND);
   proto.set_message("Session not found");
-  proto.add_details()->PackFrom(resource_info);
+  (void)proto.add_details()->PackFrom(resource_info);
 
   return grpc::Status(grpc::StatusCode::NOT_FOUND, proto.message(),
                       proto.SerializeAsString());
diff --git a/google/cloud/spanner/value.cc b/google/cloud/spanner/value.cc
index c0fcf5c683631..39b2007a2e73e 100644
--- a/google/cloud/spanner/value.cc
+++ b/google/cloud/spanner/value.cc
@@ -186,7 +186,8 @@ std::ostream& StreamHelper(std::ostream& os,  // NOLINT(misc-no-recursion)
             auto* f = google::protobuf::MessageFactory::generated_factory();
             if (auto const* pt = f->GetPrototype(d)) {
               std::unique_ptr<google::protobuf::Message> m(pt->New());
-              m->ParseFromString(std::string(bytes->begin(), bytes->end()));
+              (void)m->ParseFromString(
+                  std::string(bytes->begin(), bytes->end()));
               return os << internal::DebugString(*m, TracingOptions{});
             }
           }
diff --git a/google/cloud/storage/internal/async/connection_impl_appendable_upload_test.cc b/google/cloud/storage/internal/async/connection_impl_appendable_upload_test.cc
index 189af38f74830..a0cb52005b049 100644
--- a/google/cloud/storage/internal/async/connection_impl_appendable_upload_test.cc
+++ b/google/cloud/storage/internal/async/connection_impl_appendable_upload_test.cc
@@ -464,7 +464,7 @@ TEST_F(AsyncConnectionImplAppendableTest, AppendableUploadRedirect) {
   redirect.mutable_write_handle()->set_handle("redirect-handle");
   redirect.set_routing_token("redirect-token");
   redirect.set_generation(4321);
-  rpc_status.add_details()->PackFrom(redirect);
+  (void)rpc_status.add_details()->PackFrom(redirect);
   std::string rpc_status_payload;
   ASSERT_TRUE(rpc_status.SerializeToString(&rpc_status_payload));
   Status status(StatusCode::kAborted, "redirect");
@@ -564,7 +564,7 @@ TEST_F(AsyncConnectionImplAppendableTest, AppendableUploadRedirectNoHandle) {
   google::storage::v2::BidiWriteObjectRedirectedError redirect;
   redirect.set_routing_token("redirect-token");
   redirect.set_generation(4321);
-  rpc_status.add_details()->PackFrom(redirect);
+  (void)rpc_status.add_details()->PackFrom(redirect);
   std::string rpc_status_payload;
   ASSERT_TRUE(rpc_status.SerializeToString(&rpc_status_payload));
   Status status(StatusCode::kAborted, "redirect");
diff --git a/google/cloud/storage/internal/async/connection_impl_open_test.cc b/google/cloud/storage/internal/async/connection_impl_open_test.cc
index 32609f98aec4e..363b9bde12cfa 100644
--- a/google/cloud/storage/internal/async/connection_impl_open_test.cc
+++ b/google/cloud/storage/internal/async/connection_impl_open_test.cc
@@ -100,10 +100,10 @@ Status RedirectError(absl::string_view handle, absl::string_view token) {
     auto details_proto = google::rpc::Status{};
     details_proto.set_code(grpc::StatusCode::ABORTED);
     details_proto.set_message("redirect");
-    details_proto.add_details()->PackFrom(redirected);
+    (void)details_proto.add_details()->PackFrom(redirected);
 
     std::string details;
-    details_proto.SerializeToString(&details);
+    (void)details_proto.SerializeToString(&details);
     return details;
   };
 
diff --git a/google/cloud/storage/internal/async/handle_redirect_error.cc b/google/cloud/storage/internal/async/handle_redirect_error.cc
index d8fe1ad0684c4..10a2c27cabfa2 100644
--- a/google/cloud/storage/internal/async/handle_redirect_error.cc
+++ b/google/cloud/storage/internal/async/handle_redirect_error.cc
@@ -24,7 +24,7 @@ google::rpc::Status ExtractGrpcStatus(Status const& status) {
   google::rpc::Status proto_status = google::rpc::Status{};
   auto payload = google::cloud::internal::GetPayload(
       status, google::cloud::internal::StatusPayloadGrpcProto());
-  if (payload) proto_status.ParseFromString(*payload);
+  if (payload) (void)proto_status.ParseFromString(*payload);
   return proto_status;
 }
 
diff --git a/google/cloud/storage/internal/async/handle_redirect_error_test.cc b/google/cloud/storage/internal/async/handle_redirect_error_test.cc
index b3ecca5bb5073..60d2154fb8394 100644
--- a/google/cloud/storage/internal/async/handle_redirect_error_test.cc
+++ b/google/cloud/storage/internal/async/handle_redirect_error_test.cc
@@ -95,7 +95,7 @@ TEST(ApplyWriteRedirectErrors, Success) {
   redirect.mutable_write_handle()->set_handle("test-handle");
   redirect.set_routing_token("test-token");
   redirect.set_generation(1234);
-  rpc_status.add_details()->PackFrom(redirect);
+  (void)rpc_status.add_details()->PackFrom(redirect);
 
   ApplyWriteRedirectErrors(spec, rpc_status);
   EXPECT_EQ(spec.bucket(), "projects/_/buckets/test-bucket");
@@ -138,7 +138,7 @@ TEST(HandleBidiWriteRedirect, NoWriteHandle) {
   google::rpc::Status rpc_status;
   google::storage::v2::BidiWriteObjectRedirectedError redirect;
   redirect.set_routing_token("test-token");
-  rpc_status.add_details()->PackFrom(redirect);
+  (void)rpc_status.add_details()->PackFrom(redirect);
 
   auto info = HandleBidiWriteRedirect(request, rpc_status);
   EXPECT_EQ(info.routing_token, "test-token");
@@ -163,7 +163,7 @@ TEST(HandleBidiWriteRedirect, WithWriteHandleForWriteObjectSpec) {
   redirect.mutable_write_handle()->set_handle("test-handle");
   redirect.set_routing_token("test-token");
   redirect.set_generation(1234);
-  rpc_status.add_details()->PackFrom(redirect);
+  (void)rpc_status.add_details()->PackFrom(redirect);
 
   auto info = HandleBidiWriteRedirect(request, rpc_status);
   EXPECT_EQ(info.routing_token, "test-token");
@@ -199,7 +199,7 @@ TEST(HandleBidiWriteRedirect, WithWriteHandleForAppendObjectSpec) {
   redirect.mutable_write_handle()->set_handle("test-handle");
   redirect.set_routing_token("test-token");
   redirect.set_generation(1234);
-  rpc_status.add_details()->PackFrom(redirect);
+  (void)rpc_status.add_details()->PackFrom(redirect);
 
   auto info = HandleBidiWriteRedirect(request, rpc_status);
   EXPECT_EQ(info.routing_token, "test-token");
diff --git a/google/cloud/storage/internal/async/object_descriptor_impl_test.cc b/google/cloud/storage/internal/async/object_descriptor_impl_test.cc
index eecbcba6d6d85..326a9da2dd339 100644
--- a/google/cloud/storage/internal/async/object_descriptor_impl_test.cc
+++ b/google/cloud/storage/internal/async/object_descriptor_impl_test.cc
@@ -891,10 +891,10 @@ Status RedirectError(absl::string_view handle, absl::string_view token) {
     auto details_proto = google::rpc::Status{};
     details_proto.set_code(grpc::StatusCode::UNAVAILABLE);
     details_proto.set_message("redirect");
-    details_proto.add_details()->PackFrom(redirected);
+    (void)details_proto.add_details()->PackFrom(redirected);
 
     std::string details;
-    details_proto.SerializeToString(&details);
+    (void)details_proto.SerializeToString(&details);
     return details;
   };
 
@@ -1121,10 +1121,10 @@ Status PartialFailure(std::int64_t read_id) {
     auto details_proto = google::rpc::Status{};
     details_proto.set_code(grpc::StatusCode::INVALID_ARGUMENT);
     details_proto.set_message("some reads are out of range");
-    details_proto.add_details()->PackFrom(error);
+    (void)details_proto.add_details()->PackFrom(error);
 
     std::string details;
-    details_proto.SerializeToString(&details);
+    (void)details_proto.SerializeToString(&details);
     return details;
   };
 
diff --git a/google/cloud/storage/internal/async/open_object_test.cc b/google/cloud/storage/internal/async/open_object_test.cc
index 265cfdfd5ad9e..aabeafef634be 100644
--- a/google/cloud/storage/internal/async/open_object_test.cc
+++ b/google/cloud/storage/internal/async/open_object_test.cc
@@ -68,7 +68,7 @@ TEST(OpenImpl, RequestParams) {
 
   auto params = [](auto text) {
     auto r = google::storage::v2::BidiReadObjectRequest{};
-    TextFormat::ParseFromString(text, &r);
+    (void)TextFormat::ParseFromString(text, &r);
     return RequestParams(r);
   };
   EXPECT_EQ(params(kPlain), "bucket=projects/_/buckets/test-bucket-name");
diff --git a/google/cloud/storage/internal/async/writer_connection_finalized_test.cc b/google/cloud/storage/internal/async/writer_connection_finalized_test.cc
index 743ad082050d5..86d2a54f10fe3 100644
--- a/google/cloud/storage/internal/async/writer_connection_finalized_test.cc
+++ b/google/cloud/storage/internal/async/writer_connection_finalized_test.cc
@@ -36,7 +36,7 @@ auto MakeTestObject() {
     name: "test-object"
   )pb";
   auto object = google::storage::v2::Object{};
-  google::protobuf::TextFormat::ParseFromString(kText, &object);
+  (void)google::protobuf::TextFormat::ParseFromString(kText, &object);
   return object;
 }
 
diff --git a/google/cloud/storage/internal/async/writer_connection_impl_test.cc b/google/cloud/storage/internal/async/writer_connection_impl_test.cc
index 7e16808831278..7d5c40a902a10 100644
--- a/google/cloud/storage/internal/async/writer_connection_impl_test.cc
+++ b/google/cloud/storage/internal/async/writer_connection_impl_test.cc
@@ -708,7 +708,7 @@ TEST(AsyncWriterConnectionTest, FlushFailsWithRedirect) {
   redirect.mutable_write_handle()->set_handle("redirect-handle");
   redirect.set_routing_token("redirect-token");
   redirect.set_generation(4321);
-  rpc_status.add_details()->PackFrom(redirect);
+  (void)rpc_status.add_details()->PackFrom(redirect);
   std::string rpc_status_payload;
   ASSERT_TRUE(rpc_status.SerializeToString(&rpc_status_payload));
   Status status(StatusCode::kAborted, "redirect");