Index: test/tools/llvm-objcopy/discard-all.test
===================================================================
--- test/tools/llvm-objcopy/discard-all.test
+++ test/tools/llvm-objcopy/discard-all.test
@@ -1,8 +1,18 @@
 # RUN: yaml2obj %s > %t
+# RUN: cp %t %t1
 # RUN: llvm-objcopy --discard-all %t %t2
-# RUN: llvm-objcopy -x %t %t3
+# Verify that llvm-objcopy has not modified the input.
+# RUN: cmp %t %t1
 # RUN: llvm-readobj -symbols %t2 | FileCheck %s
-# RUN: diff %t2 %t3
+
+# RUN: llvm-objcopy -x %t %t3
+# Verify that llvm-objcopy has not modified the input.
+# RUN: cmp %t %t1
+# RUN: cmp %t2 %t3
+
+# Verify that llvm-strip modifes the symbols table the same way.
+# RUN: llvm-strip -d --discard-all %t
+# RUN: cmp %t2 %t
 
 !ELF
 FileHeader:
Index: tools/llvm-objcopy/StripOpts.td
===================================================================
--- tools/llvm-objcopy/StripOpts.td
+++ tools/llvm-objcopy/StripOpts.td
@@ -36,3 +36,8 @@
 
 def K : JoinedOrSeparate<["-"], "K">,
         Alias<keep_symbol>;
+
+def discard_all : Flag<["-", "--"], "discard-all">,
+                  HelpText<"Remove all local symbols except file and section symbols">;
+def x : Flag<["-"], "x">,
+        Alias<discard_all>;
Index: tools/llvm-objcopy/llvm-objcopy.cpp
===================================================================
--- tools/llvm-objcopy/llvm-objcopy.cpp
+++ tools/llvm-objcopy/llvm-objcopy.cpp
@@ -588,6 +588,8 @@
   if (!Config.StripDebug)
     Config.StripAll = true;
 
+  Config.DiscardAll = InputArgs.hasArg(STRIP_discard_all);
+
   for (auto Arg : InputArgs.filtered(STRIP_remove_section))
     Config.ToRemove.push_back(Arg->getValue());