Index: lld/COFF/CMakeLists.txt
===================================================================
--- lld/COFF/CMakeLists.txt
+++ lld/COFF/CMakeLists.txt
@@ -18,7 +18,6 @@
   MarkLive.cpp
   MinGW.cpp
   PDB.cpp
-  Strings.cpp
   SymbolTable.cpp
   Symbols.cpp
   Writer.cpp
Index: lld/COFF/Symbols.cpp
===================================================================
--- lld/COFF/Symbols.cpp
+++ lld/COFF/Symbols.cpp
@@ -10,8 +10,8 @@
 #include "Symbols.h"
 #include "InputFiles.h"
 #include "Memory.h"
-#include "Strings.h"
 #include "lld/Common/ErrorHandler.h"
+#include "lld/Common/Strings.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
@@ -21,7 +21,7 @@
 
 // Returns a symbol name for an error message.
 std::string lld::toString(coff::Symbol &B) {
-  if (Optional<std::string> S = coff::demangle(B.getName()))
+  if (Optional<std::string> S = demangleMSVC(B.getName()))
     return ("\"" + *S + "\" (" + B.getName() + ")").str();
   return B.getName();
 }
Index: lld/Common/CMakeLists.txt
===================================================================
--- lld/Common/CMakeLists.txt
+++ lld/Common/CMakeLists.txt
@@ -5,6 +5,7 @@
 add_lld_library(lldCommon
   ErrorHandler.cpp
   Reproduce.cpp
+  Strings.cpp
   TargetOptionsCommandFlags.cpp
   Threads.cpp
   Version.cpp
Index: lld/Common/Strings.cpp
===================================================================
--- lld/Common/Strings.cpp
+++ lld/Common/Strings.cpp
@@ -7,20 +7,38 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "Strings.h"
-#include <mutex>
+#include "lld/Common/Strings.h"
+#include "llvm/Demangle/Demangle.h"
 
 #if defined(_MSC_VER)
-#include <Windows.h>
 #include <DbgHelp.h>
+#include <Windows.h>
+#include <mutex>
 #pragma comment(lib, "dbghelp.lib")
 #endif
 
-using namespace lld;
-using namespace lld::coff;
 using namespace llvm;
+using namespace lld;
+
+// Returns the demangled C++ symbol name for Name.
+Optional<std::string> lld::demangleItanium(StringRef Name) {
+  // itaniumDemangle can be used to demangle strings other than symbol
+  // names which do not necessarily start with "_Z". Name can be
+  // either a C or C++ symbol. Don't call itaniumDemangle if the name
+  // does not look like a C++ symbol name to avoid getting unexpected
+  // result for a C symbol that happens to match a mangled type name.
+  if (!Name.startswith("_Z"))
+    return None;
+
+  char *Buf = itaniumDemangle(Name.str().c_str(), nullptr, nullptr, nullptr);
+  if (!Buf)
+    return None;
+  std::string S(Buf);
+  free(Buf);
+  return S;
+}
 
-Optional<std::string> coff::demangle(StringRef S) {
+Optional<std::string> lld::demangleMSVC(StringRef S) {
 #if defined(_MSC_VER)
   // UnDecorateSymbolName is not thread-safe, so we need a mutex.
   static std::mutex Mu;
Index: lld/ELF/Strings.h
===================================================================
--- lld/ELF/Strings.h
+++ lld/ELF/Strings.h
@@ -66,10 +66,6 @@
   std::vector<llvm::GlobPattern> Patterns;
 };
 
-// Returns a demangled C++ symbol name. If Name is not a mangled
-// name, it returns Optional::None.
-llvm::Optional<std::string> demangle(StringRef Name);
-
 inline ArrayRef<uint8_t> toArrayRef(StringRef S) {
   return {(const uint8_t *)S.data(), S.size()};
 }
Index: lld/ELF/Strings.cpp
===================================================================
--- lld/ELF/Strings.cpp
+++ lld/ELF/Strings.cpp
@@ -60,21 +60,3 @@
          std::all_of(S.begin() + 1, S.end(),
                      [](char C) { return C == '_' || isAlnum(C); });
 }
-
-// Returns the demangled C++ symbol name for Name.
-Optional<std::string> elf::demangle(StringRef Name) {
-  // itaniumDemangle can be used to demangle strings other than symbol
-  // names which do not necessarily start with "_Z". Name can be
-  // either a C or C++ symbol. Don't call itaniumDemangle if the name
-  // does not look like a C++ symbol name to avoid getting unexpected
-  // result for a C symbol that happens to match a mangled type name.
-  if (!Name.startswith("_Z"))
-    return None;
-
-  char *Buf = itaniumDemangle(Name.str().c_str(), nullptr, nullptr, nullptr);
-  if (!Buf)
-    return None;
-  std::string S(Buf);
-  free(Buf);
-  return S;
-}
Index: lld/ELF/SymbolTable.cpp
===================================================================
--- lld/ELF/SymbolTable.cpp
+++ lld/ELF/SymbolTable.cpp
@@ -21,6 +21,7 @@
 #include "Symbols.h"
 #include "SyntheticSections.h"
 #include "lld/Common/ErrorHandler.h"
+#include "lld/Common/Strings.h"
 #include "llvm/ADT/STLExtras.h"
 
 using namespace llvm;
@@ -632,7 +633,7 @@
     for (Symbol *Sym : SymVector) {
       if (!Sym->isDefined())
         continue;
-      if (Optional<std::string> S = demangle(Sym->getName()))
+      if (Optional<std::string> S = demangleItanium(Sym->getName()))
         (*DemangledSyms)[*S].push_back(Sym);
       else
         (*DemangledSyms)[Sym->getName()].push_back(Sym);
Index: lld/ELF/Symbols.cpp
===================================================================
--- lld/ELF/Symbols.cpp
+++ lld/ELF/Symbols.cpp
@@ -11,12 +11,12 @@
 #include "InputFiles.h"
 #include "InputSection.h"
 #include "OutputSections.h"
-#include "Strings.h"
 #include "SyntheticSections.h"
 #include "Target.h"
 #include "Writer.h"
 
 #include "lld/Common/ErrorHandler.h"
+#include "lld/Common/Strings.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Path.h"
 #include <cstring>
@@ -315,7 +315,7 @@
 // Returns a symbol for an error message.
 std::string lld::toString(const Symbol &B) {
   if (Config->Demangle)
-    if (Optional<std::string> S = demangle(B.getName()))
+    if (Optional<std::string> S = demangleItanium(B.getName()))
       return *S;
   return B.getName();
 }
Index: lld/include/lld/Common/Strings.h
===================================================================
--- lld/include/lld/Common/Strings.h
+++ lld/include/lld/Common/Strings.h
@@ -7,17 +7,18 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLD_COFF_STRINGS_H
-#define LLD_COFF_STRINGS_H
+#ifndef LLD_STRINGS_H
+#define LLD_STRINGS_H
 
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include <string>
 
 namespace lld {
-namespace coff {
-llvm::Optional<std::string> demangle(llvm::StringRef S);
-}
+// Returns a demangled C++ symbol name. If Name is not a mangled
+// name, it returns Optional::None.
+llvm::Optional<std::string> demangleItanium(llvm::StringRef Name);
+llvm::Optional<std::string> demangleMSVC(llvm::StringRef Name);
 }
 
 #endif
Index: lld/wasm/Strings.h
===================================================================
--- lld/wasm/Strings.h
+++ lld/wasm/Strings.h
@@ -17,10 +17,6 @@
 namespace lld {
 namespace wasm {
 
-// Returns a demangled C++ symbol name. If Name is not a mangled
-// name, it returns Optional::None.
-llvm::Optional<std::string> demangle(llvm::StringRef Name);
-
 std::string displayName(llvm::StringRef Name);
 
 } // namespace wasm
Index: lld/wasm/Strings.cpp
===================================================================
--- lld/wasm/Strings.cpp
+++ lld/wasm/Strings.cpp
@@ -9,32 +9,14 @@
 
 #include "Strings.h"
 #include "Config.h"
+#include "lld/Common/Strings.h"
 #include "llvm/ADT/StringRef.h"
-#include "llvm/Demangle/Demangle.h"
 
 using namespace llvm;
 
-// Returns the demangled C++ symbol name for Name.
-Optional<std::string> lld::wasm::demangle(StringRef Name) {
-  // itaniumDemangle can be used to demangle strings other than symbol
-  // names which do not necessarily start with "_Z". Name can be
-  // either a C or C++ symbol. Don't call itaniumDemangle if the name
-  // does not look like a C++ symbol name to avoid getting unexpected
-  // result for a C symbol that happens to match a mangled type name.
-  if (!Name.startswith("_Z"))
-    return None;
-
-  char *Buf = itaniumDemangle(Name.str().c_str(), nullptr, nullptr, nullptr);
-  if (!Buf)
-    return None;
-  std::string S(Buf);
-  free(Buf);
-  return S;
-}
-
 std::string lld::wasm::displayName(StringRef Name) {
   if (Config->Demangle)
-    if (Optional<std::string> S = demangle(Name))
+    if (Optional<std::string> S = demangleItanium(Name))
       return "`" + *S + "'";
   return Name;
 }