Index: test/tools/llvm-objcopy/strip-dwo-inplace.test
===================================================================
--- test/tools/llvm-objcopy/strip-dwo-inplace.test
+++ test/tools/llvm-objcopy/strip-dwo-inplace.test
@@ -0,0 +1,29 @@
+# RUN: cp %p/Inputs/dwarf.dwo %t
+# RUN: llvm-objcopy -strip-dwo %t
+# RUN: llvm-readobj -file-headers -sections %t | FileCheck %s
+
+CHECK:     SectionHeaderCount: 24
+
+CHECK:    Name: .text
+CHECK:    Name: .rodata.str1.1
+CHECK:    Name: .debug_str
+CHECK:    Name: .debug_abbrev
+CHECK:    Name: .debug_info
+CHECK:    Name: .debug_ranges
+CHECK:    Name: .debug_macinfo
+CHECK:    Name: .debug_addr
+CHECK:    Name: .debug_pubnames
+CHECK:    Name: .debug_pubtypes
+CHECK:    Name: .comment
+CHECK:    Name: .note.GNU-stack
+CHECK:    Name: .debug_frame
+CHECK:    Name: .debug_line
+CHECK:    Name: .symtab
+CHECK:    Name: .rela.text
+CHECK:    Name: .rela.debug_info
+CHECK:    Name: .rela.debug_addr
+CHECK:    Name: .rela.debug_pubnames
+CHECK:    Name: .rela.debug_pubtypes
+CHECK:    Name: .rela.debug_frame
+CHECK:    Name: .rela.debug_line
+CHECK:    Name: .strtab
Index: tools/llvm-objcopy/llvm-objcopy.cpp
===================================================================
--- tools/llvm-objcopy/llvm-objcopy.cpp
+++ tools/llvm-objcopy/llvm-objcopy.cpp
@@ -72,8 +72,8 @@
 } // end namespace llvm
 
 static cl::opt<std::string> InputFilename(cl::Positional, cl::desc("<input>"));
-static cl::opt<std::string> OutputFilename(cl::Positional, cl::desc("<output>"),
-                                           cl::init("-"));
+static cl::opt<std::string> OutputFilename(cl::Positional, cl::desc("[ <output> ]"));
+
 static cl::opt<std::string>
     OutputFormat("O", cl::desc("Set output format to one of the following:"
                                "\n\tbinary"));
@@ -340,7 +340,9 @@
 
   auto Reader = CreateReader();
   auto Obj = Reader->create();
-  auto Writer = CreateWriter(*Obj, OutputFilename);
+  StringRef Output =
+      OutputFilename.getNumOccurrences() ? OutputFilename : InputFilename;
+  auto Writer = CreateWriter(*Obj, Output);
   HandleArgs(*Obj, *Reader);
   Writer->finalize();
   Writer->write();