[CI] Spurious test failures (open-telemetry#3233)

Author: marcalff

examples/batch/main.cc

@@ -81,7 +81,7 @@ void StartAndEndSpans()
 
 }  // namespace
 
-int main()
+int main(int /* argc */, char ** /* argv */)
 {
   // Removing this line will leave the default noop TracerProvider in place.
   InitTracer();
@@ -107,4 +107,5 @@ int main()
   // which in turn invokes the processor Shutdown(), which finally drains the queue of ALL
   // its spans.
   CleanupTracer();
+  return 0;
 }

examples/http/client.cc

@@ -95,4 +95,5 @@ int main(int argc, char *argv[])
                     std::string(default_path);
   sendRequest(url);
   CleanupTracer();
+  return 0;
 }

examples/logs_simple/main.cc

@@ -80,11 +80,12 @@ void CleanupLogger()
 
 }  // namespace
 
-int main()
+int main(int /* argc */, char ** /* argv */)
 {
   InitTracer();
   InitLogger();
   foo_library();
   CleanupTracer();
   CleanupLogger();
+  return 0;
 }

examples/metrics_simple/metrics_ostream.cc

@@ -190,4 +190,5 @@ int main(int argc, char **argv)
   }
 
   CleanupMetrics();
+  return 0;
 }

examples/multi_processor/main.cc

@@ -98,7 +98,7 @@ void dumpSpans(std::vector<std::unique_ptr<trace_sdk::SpanData>> &spans)
 }
 }  // namespace
 
-int main()
+int main(int /* argc */, char ** /* argv */)
 {
   // Removing this line will leave the default noop TracerProvider in place.
   std::shared_ptr<InMemorySpanData> data = InitTracer();
@@ -108,4 +108,5 @@ int main()
   dumpSpans(memory_spans);
 
   CleanupTracer();
+  return 0;
 }

examples/multithreaded/main.cc

@@ -70,7 +70,7 @@ void run_threads()
   std::for_each(threads.begin(), threads.end(), [](std::thread &th) { th.join(); });
 }
 
-int main()
+int main(int /* argc */, char ** /* argv */)
 {
   InitTracer();
 
@@ -82,4 +82,5 @@ int main()
   }
 
   CleanupTracer();
+  return 0;
 }

examples/otlp/file_log_main.cc

@@ -125,4 +125,5 @@ int main(int argc, char *argv[])
   foo_library();
   CleanupTracer();
   CleanupLogger();
+  return 0;
 }

examples/otlp/file_main.cc

@@ -72,4 +72,5 @@ int main(int argc, char *argv[])
   foo_library();
 
   CleanupTracer();
+  return 0;
 }

examples/otlp/file_metric_main.cc

@@ -122,4 +122,5 @@ int main(int argc, char *argv[])
   }
 
   CleanupMetrics();
+  return 0;
 }

examples/otlp/grpc_log_main.cc

@@ -111,4 +111,5 @@ int main(int argc, char *argv[])
   foo_library();
   CleanupTracer();
   CleanupLogger();
+  return 0;
 }