Disable debug-only test in release builds to avoid expected failures. (#1595)

Co-authored-by: Andy Christiansen <achristiansen@google.com>

test/diagnostics_test.cc

@@ -76,7 +76,16 @@ void BM_diagnostic_test_keep_running(benchmark::State& state) {
 BENCHMARK(BM_diagnostic_test_keep_running);
 
 int main(int argc, char* argv[]) {
+#ifdef NDEBUG
+  // This test is exercising functionality for debug builds, which are not
+  // available in release builds. Skip the test if we are in that environment
+  // to avoid a test failure.
+  std::cout << "Diagnostic test disabled in release build" << std::endl;
+  (void)argc;
+  (void)argv;
+#else
   benchmark::internal::GetAbortHandler() = &TestHandler;
   benchmark::Initialize(&argc, argv);
   benchmark::RunSpecifiedBenchmarks();
+#endif
 }