From c834c47dfc8006fbdf95a22ea4241b53d7235915 Mon Sep 17 00:00:00 2001
From: jasjuang <jasjuang@gmail.com>
Date: Fri, 11 Jan 2019 09:39:47 -0800
Subject: cpplint: only print diagnostics to console if there are errors

Fixes: #18781
---
 Source/cmcmd.cxx | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Source/cmcmd.cxx b/Source/cmcmd.cxx
index 930ced9..7287594 100644
--- a/Source/cmcmd.cxx
+++ b/Source/cmcmd.cxx
@@ -270,9 +270,12 @@ static int HandleCppLint(const std::string& runCmd,
               << "\n";
     return 1;
   }
-  std::cerr << "Warning: cpplint diagnostics:\n";
-  // Output the output from cpplint to stderr
-  std::cerr << stdOut;
+  if (!stdOut.empty()) {
+    std::cerr << "Warning: cpplint diagnostics:\n";
+    // Output the output from cpplint to stderr
+    std::cerr << stdOut;
+  }
+
   // always return 0 so the build can continue as cpplint returns non-zero
   // for any warning
   return 0;
-- 
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