Index: clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
===================================================================
--- clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
+++ clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
@@ -241,31 +241,36 @@
 namespace tidy {
 
 static void printStats(const ClangTidyStats &Stats) {
+  std::string Msg;
+  llvm::raw_string_ostream ErrStream(Msg);
+
   if (Stats.errorsIgnored()) {
-    llvm::errs() << "Suppressed " << Stats.errorsIgnored() << " warnings (";
+    ErrStream << "Suppressed " << Stats.errorsIgnored() << " warnings (";
+
     StringRef Separator = "";
     if (Stats.ErrorsIgnoredNonUserCode) {
-      llvm::errs() << Stats.ErrorsIgnoredNonUserCode << " in non-user code";
+      ErrStream << Stats.ErrorsIgnoredNonUserCode << " in non-user code";
       Separator = ", ";
     }
     if (Stats.ErrorsIgnoredLineFilter) {
-      llvm::errs() << Separator << Stats.ErrorsIgnoredLineFilter
-                   << " due to line filter";
+      ErrStream << Separator << Stats.ErrorsIgnoredLineFilter
+                << " due to line filter";
       Separator = ", ";
     }
     if (Stats.ErrorsIgnoredNOLINT) {
-      llvm::errs() << Separator << Stats.ErrorsIgnoredNOLINT << " NOLINT";
+      ErrStream << Separator << Stats.ErrorsIgnoredNOLINT << " NOLINT";
       Separator = ", ";
     }
     if (Stats.ErrorsIgnoredCheckFilter)
-      llvm::errs() << Separator << Stats.ErrorsIgnoredCheckFilter
-                   << " with check filters";
-    llvm::errs() << ").\n";
+      ErrStream << Separator << Stats.ErrorsIgnoredCheckFilter
+                << " with check filters";
+    ErrStream << ").\n";
     if (Stats.ErrorsIgnoredNonUserCode)
-      llvm::errs() << "Use -header-filter=.* to display errors from all "
-                      "non-system headers. Use -system-headers to display "
-                      "errors from system headers as well.\n";
+      ErrStream << "Use -header-filter=.* to display errors from all "
+                   "non-system headers. Use -system-headers to display "
+                   "errors from system headers as well.\n";
   }
+  llvm::errs() << ErrStream.str();
 }
 
 static std::unique_ptr<ClangTidyOptionsProvider> createOptionsProvider(