Index: test/tools/llvm-objcopy/localize-hidden.test
===================================================================
--- test/tools/llvm-objcopy/localize-hidden.test
+++ test/tools/llvm-objcopy/localize-hidden.test
@@ -6,7 +6,7 @@
 FileHeader:
   Class:           ELFCLASS64
   Data:            ELFDATA2LSB
-  Type:            ET_REL
+  Type:            ET_EXEC
   Machine:         EM_X86_64
 Sections:
   - Name:            .text
@@ -55,6 +55,18 @@
       Value:    0x2006
       Size:     2
       Visibility: STV_HIDDEN
+    - Name:     hiddenGlobalCommon
+      Type:     STT_OBJECT
+      Index:    SHN_COMMON
+      Value:    0x2006
+      Size:     2
+      Visibility: STV_HIDDEN
+    - Name:     hiddenGlobalSttCommon
+      Type:     STT_COMMON
+      Section:  .data
+      Value:    0x2006
+      Size:     2
+      Visibility: STV_HIDDEN
     - Name:     undefGlobal
       Type:     STT_FUNC
       Size:     8
@@ -142,6 +154,28 @@
 #CHECK-NEXT:    Section: .text
 #CHECK-NEXT:  }
 #CHECK-NEXT:  Symbol {
+#CHECK-NEXT:    Name: hiddenGlobalCommon
+#CHECK-NEXT:    Value: 0x2006
+#CHECK-NEXT:    Size: 2
+#CHECK-NEXT:    Binding: Global
+#CHECK-NEXT:    Type: Object
+#CHECK-NEXT:    Other [
+#CHECK-NEXT:      STV_HIDDEN
+#CHECK-NEXT:    ]
+#CHECK-NEXT:    Section: Common (0xF
+#CHECK-NEXT:  }
+#CHECK-NEXT:  Symbol {
+#CHECK-NEXT:    Name: hiddenGlobalSttCommon
+#CHECK-NEXT:    Value: 0x2006
+#CHECK-NEXT:    Size: 2
+#CHECK-NEXT:    Binding: Global
+#CHECK-NEXT:    Type: Common
+#CHECK-NEXT:    Other [
+#CHECK-NEXT:      STV_HIDDEN
+#CHECK-NEXT:    ]
+#CHECK-NEXT:    Section: Common (0x{{[^F]}}
+#CHECK-NEXT:  }
+#CHECK-NEXT:  Symbol {
 #CHECK-NEXT:    Name: undefGlobal
 #CHECK-NEXT:    Value: 0x0
 #CHECK-NEXT:    Size: 8
Index: test/tools/llvm-objcopy/localize.test
===================================================================
--- test/tools/llvm-objcopy/localize.test
+++ test/tools/llvm-objcopy/localize.test
@@ -1,12 +1,18 @@
 # RUN: yaml2obj %s > %t
-# RUN: llvm-objcopy --localize-symbol Global -L Local -L Weak %t %t2
+# RUN: llvm-objcopy \
+# RUN:     --localize-symbol Global \
+# RUN:     -L Local \
+# RUN:     -L Weak \
+# RUN:     -L GlobalCommon \
+# RUN:     -L GlobalSttCommon \
+# RUN:     %t %t2
 # RUN: llvm-readobj -symbols %t2 | FileCheck %s
 
 !ELF
 FileHeader:
   Class:           ELFCLASS64
   Data:            ELFDATA2LSB
-  Type:            ET_REL
+  Type:            ET_EXEC
   Machine:         EM_X86_64
 Sections:
   - Name:            .text
@@ -40,6 +46,16 @@
       Size:     8
       Section:  .text
       Value:    0x1010
+    - Name:     GlobalCommon
+      Type:     STT_OBJECT
+      Index:    SHN_COMMON
+      Value:    0x2006
+      Size:     2
+    - Name:     GlobalSttCommon
+      Type:     STT_COMMON
+      Section:  .data
+      Value:    0x2006
+      Size:     2
 
 #CHECK: Symbols [
 #CHECK-NEXT:  Symbol {
@@ -78,4 +94,22 @@
 #CHECK-NEXT:    Other: 0
 #CHECK-NEXT:    Section: .text
 #CHECK-NEXT:  }
+#CHECK-NEXT:  Symbol {
+#CHECK-NEXT:    Name: GlobalCommon
+#CHECK-NEXT:    Value: 0x2006
+#CHECK-NEXT:    Size: 2
+#CHECK-NEXT:    Binding: Global
+#CHECK-NEXT:    Type: Object
+#CHECK-NEXT:    Other: 0
+#CHECK-NEXT:    Section: Common (0xF
+#CHECK-NEXT:  }
+#CHECK-NEXT:  Symbol {
+#CHECK-NEXT:    Name: GlobalSttCommon
+#CHECK-NEXT:    Value: 0x2006
+#CHECK-NEXT:    Size: 2
+#CHECK-NEXT:    Binding: Global
+#CHECK-NEXT:    Type: Common
+#CHECK-NEXT:    Other: 0
+#CHECK-NEXT:    Section: Common (0x{{[^F]}}
+#CHECK-NEXT:  }
 #CHECK-NEXT:]
Index: tools/llvm-objcopy/ELF/ELFObjcopy.cpp
===================================================================
--- tools/llvm-objcopy/ELF/ELFObjcopy.cpp
+++ tools/llvm-objcopy/ELF/ELFObjcopy.cpp
@@ -213,10 +213,11 @@
   // them.
   if (Obj.SymbolTable) {
     Obj.SymbolTable->updateSymbols([&](Symbol &Sym) {
-      if ((Config.LocalizeHidden &&
-           (Sym.Visibility == STV_HIDDEN || Sym.Visibility == STV_INTERNAL)) ||
-          (!Config.SymbolsToLocalize.empty() &&
-           is_contained(Config.SymbolsToLocalize, Sym.Name)))
+      if (!Sym.isCommon() &&
+          ((Config.LocalizeHidden &&
+            (Sym.Visibility == STV_HIDDEN || Sym.Visibility == STV_INTERNAL)) ||
+           (!Config.SymbolsToLocalize.empty() &&
+            is_contained(Config.SymbolsToLocalize, Sym.Name))))
         Sym.Binding = STB_LOCAL;
 
       // Note: these two globalize flags have very similar names but different
Index: tools/llvm-objcopy/ELF/Object.h
===================================================================
--- tools/llvm-objcopy/ELF/Object.h
+++ tools/llvm-objcopy/ELF/Object.h
@@ -415,6 +415,7 @@
   bool Referenced = false;
 
   uint16_t getShndx() const;
+  bool isCommon() const;
 };
 
 class SectionIndexSection : public SectionBase {
Index: tools/llvm-objcopy/ELF/Object.cpp
===================================================================
--- tools/llvm-objcopy/ELF/Object.cpp
+++ tools/llvm-objcopy/ELF/Object.cpp
@@ -332,6 +332,10 @@
   llvm_unreachable("Symbol with invalid ShndxType encountered");
 }
 
+bool Symbol::isCommon() const {
+  return getShndx() == SHN_COMMON || Type == STT_COMMON;
+}
+
 void SymbolTableSection::assignIndices() {
   uint32_t Index = 0;
   for (auto &Sym : Symbols)