Add a error message to cbu to match bu

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28819 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/DataStructure/CompleteBottomUp.cpp b/lib/Analysis/DataStructure/CompleteBottomUp.cpp
index 1fc4197a09755f7b1c54c57ce2821515b5e354a5..452f0338cb045fdc0abaad3243435ba6781c4302 100644 (file)
--- a/lib/Analysis/DataStructure/CompleteBottomUp.cpp
+++ b/lib/Analysis/DataStructure/CompleteBottomUp.cpp
@@ -56,8 +56,14 @@ bool CompleteBUDataStructures::runOnModule(Module &M) {
   }
 
   for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
-    if (!I->isExternal() && !DSInfo.count(I))
+    if (!I->isExternal() && !DSInfo.count(I)) {
+#ifndef NDEBUG
+      if (MainFunc)
+        std::cerr << "*** CBU: Function unreachable from main: "
+                  << I->getName() << "\n";
+#endif
       calculateSCCGraphs(getOrCreateGraph(*I), Stack, NextID, ValMap);
+    }
 
   GlobalsGraph->removeTriviallyDeadNodes();