Index: llvm/trunk/lib/Transforms/IPO/SampleProfile.cpp
===================================================================
--- llvm/trunk/lib/Transforms/IPO/SampleProfile.cpp
+++ llvm/trunk/lib/Transforms/IPO/SampleProfile.cpp
@@ -111,6 +111,11 @@
     cl::desc("Emit a warning if less than N% of samples in the input profile "
              "are matched to the IR."));
 
+static cl::opt<bool> NoWarnSampleUnused(
+    "no-warn-sample-unused", cl::init(false), cl::Hidden,
+    cl::desc("Use this option to turn off/on warnings about function with "
+             "samples but without debug information to use those samples. "));
+
 namespace {
 
 using BlockWeightMap = DenseMap<const BasicBlock *, uint64_t>;
@@ -1360,6 +1365,9 @@
   if (DISubprogram *S = F.getSubprogram())
     return S->getLine();
 
+  if (NoWarnSampleUnused)
+    return 0;
+
   // If the start of \p F is missing, emit a diagnostic to inform the user
   // about the missed opportunity.
   F.getContext().diagnose(DiagnosticInfoSampleProfile(