Index: llvm/trunk/include/llvm/ProfileData/InstrProf.h
===================================================================
--- llvm/trunk/include/llvm/ProfileData/InstrProf.h
+++ llvm/trunk/include/llvm/ProfileData/InstrProf.h
@@ -292,7 +292,8 @@
   counter_overflow,
   value_site_count_mismatch,
   compress_failed,
-  uncompress_failed
+  uncompress_failed,
+  empty_raw_profile
 };
 
 inline std::error_code make_error_code(instrprof_error E) {
Index: llvm/trunk/lib/ProfileData/InstrProf.cpp
===================================================================
--- llvm/trunk/lib/ProfileData/InstrProf.cpp
+++ llvm/trunk/lib/ProfileData/InstrProf.cpp
@@ -70,6 +70,8 @@
     return "Failed to compress data (zlib)";
   case instrprof_error::uncompress_failed:
     return "Failed to uncompress data (zlib)";
+  case instrprof_error::empty_raw_profile:
+    return "Empty raw profile file";
   }
   llvm_unreachable("A value of instrprof_error has no message.");
 }
Index: llvm/trunk/lib/ProfileData/InstrProfReader.cpp
===================================================================
--- llvm/trunk/lib/ProfileData/InstrProfReader.cpp
+++ llvm/trunk/lib/ProfileData/InstrProfReader.cpp
@@ -46,6 +46,9 @@
   if (Buffer->getBufferSize() > std::numeric_limits<unsigned>::max())
     return make_error<InstrProfError>(instrprof_error::too_large);
 
+  if (Buffer->getBufferSize() == 0)
+    return make_error<InstrProfError>(instrprof_error::empty_raw_profile);
+
   std::unique_ptr<InstrProfReader> Result;
   // Create the reader.
   if (IndexedInstrProfReader::hasFormat(*Buffer))
Index: llvm/trunk/test/tools/llvm-profdata/Inputs/IR_profile.proftext
===================================================================
--- llvm/trunk/test/tools/llvm-profdata/Inputs/IR_profile.proftext
+++ llvm/trunk/test/tools/llvm-profdata/Inputs/IR_profile.proftext
@@ -0,0 +1,9 @@
+:ir
+main
+# Func Hash:
+12884901887
+# Num Counters:
+1
+# Counter Values:
+1
+
Index: llvm/trunk/test/tools/llvm-profdata/Inputs/clang_profile.proftext
===================================================================
--- llvm/trunk/test/tools/llvm-profdata/Inputs/clang_profile.proftext
+++ llvm/trunk/test/tools/llvm-profdata/Inputs/clang_profile.proftext
@@ -0,0 +1,8 @@
+main
+# Func Hash:
+0
+# Num Counters:
+1
+# Counter Values:
+1
+
Index: llvm/trunk/test/tools/llvm-profdata/merge_empty_profile.test
===================================================================
--- llvm/trunk/test/tools/llvm-profdata/merge_empty_profile.test
+++ llvm/trunk/test/tools/llvm-profdata/merge_empty_profile.test
@@ -0,0 +1,17 @@
+# Tests for merge of empty profile files.
+
+RUN: touch %t_empty.proftext
+RUN: llvm-profdata merge -text -o %t_clang.proftext %t_empty.proftext %p/Inputs/clang_profile.proftext
+RUN: FileCheck --input-file=%t_clang.proftext %s -check-prefix=CLANG_PROF_TEXT
+CLANG_PROF_TEXT: main
+CLANG_PROF_TEXT: 0
+CLANG_PROF_TEXT: 1
+CLANG_PROF_TEXT: 1
+
+RUN: llvm-profdata merge -text -o %t_ir.proftext %t_empty.proftext %p/Inputs/IR_profile.proftext
+RUN: FileCheck --input-file=%t_ir.proftext %s -check-prefix=IR_PROF_TEXT
+IR_PROF_TEXT: :ir
+IR_PROF_TEXT: main
+IR_PROF_TEXT: 0
+IR_PROF_TEXT: 1
+IR_PROF_TEXT: 1
Index: llvm/trunk/tools/llvm-profdata/llvm-profdata.cpp
===================================================================
--- llvm/trunk/tools/llvm-profdata/llvm-profdata.cpp
+++ llvm/trunk/tools/llvm-profdata/llvm-profdata.cpp
@@ -140,8 +140,13 @@
   WC->ErrWhence = Input.Filename;
 
   auto ReaderOrErr = InstrProfReader::create(Input.Filename);
-  if ((WC->Err = ReaderOrErr.takeError()))
+  if (Error E = ReaderOrErr.takeError()) {
+    // Skip the empty profiles by returning sliently.
+    instrprof_error IPE = InstrProfError::take(std::move(E));
+    if (IPE != instrprof_error::empty_raw_profile)
+      WC->Err = make_error<InstrProfError>(IPE);
     return;
+  }
 
   auto Reader = std::move(ReaderOrErr.get());
   bool IsIRProfile = Reader->isIRLevelProfile();