Index: lld/ELF/Config.h
===================================================================
--- lld/ELF/Config.h
+++ lld/ELF/Config.h
@@ -99,6 +99,7 @@
   bool Bsymbolic;
   bool BsymbolicFunctions;
   bool ColorDiagnostics = false;
+  bool DefineCommon;
   bool Demangle = true;
   bool DisableVerify;
   bool EhFrameHdr;
Index: lld/ELF/Driver.cpp
===================================================================
--- lld/ELF/Driver.cpp
+++ lld/ELF/Driver.cpp
@@ -480,6 +480,7 @@
   Config->AllowMultipleDefinition = Args.hasArg(OPT_allow_multiple_definition);
   Config->Bsymbolic = Args.hasArg(OPT_Bsymbolic);
   Config->BsymbolicFunctions = Args.hasArg(OPT_Bsymbolic_functions);
+  Config->DefineCommon = Args.hasArg(OPT_define_common);
   Config->Demangle = getArg(Args, OPT_demangle, OPT_no_demangle, true);
   Config->DisableVerify = Args.hasArg(OPT_disable_verify);
   Config->EhFrameHdr = Args.hasArg(OPT_eh_frame_hdr);
Index: lld/ELF/Options.td
===================================================================
--- lld/ELF/Options.td
+++ lld/ELF/Options.td
@@ -45,6 +45,8 @@
 def color_diagnostics_eq: J<"color-diagnostics=">,
   HelpText<"Use colors in diagnostics">;
 
+def define_common: F<"define-common">, HelpText<"Assign space to common symbols">;
+
 def demangle: F<"demangle">, HelpText<"Demangle symbol names">;
 
 def disable_new_dtags: F<"disable-new-dtags">,
@@ -265,6 +267,9 @@
 def alias_Bstatic_non_shared: F<"non_shared">, Alias<Bstatic>;
 def alias_Bstatic_static: F<"static">, Alias<Bstatic>;
 def alias_L__library_path: J<"library-path=">, Alias<L>;
+def alias_define_common_d: Flag<["-"], "d">, Alias<define_common>;
+def alias_define_common_dc: F<"dc">, Alias<define_common>;
+def alias_define_common_dp: F<"dp">, Alias<define_common>;
 def alias_discard_all_x: Flag<["-"], "x">, Alias<discard_all>;
 def alias_discard_locals_X: Flag<["-"], "X">, Alias<discard_locals>;
 def alias_dynamic_list: J<"dynamic-list=">, Alias<dynamic_list>;
@@ -332,7 +337,6 @@
 // Options listed below are silently ignored for now for compatibility.
 def allow_shlib_undefined: F<"allow-shlib-undefined">;
 def cref: Flag<["--"], "cref">;
-def define_common: F<"define-common">;
 def detect_odr_violations: F<"detect-odr-violations">;
 def g: Flag<["-"], "g">;
 def no_add_needed: F<"no-add-needed">;
@@ -355,9 +359,6 @@
 def Qy : F<"Qy">;
 
 // Aliases for ignored options
-def alias_define_common_d: Flag<["-"], "d">, Alias<define_common>;
-def alias_define_common_dc: F<"dc">, Alias<define_common>;
-def alias_define_common_dp: F<"dp">, Alias<define_common>;
 def alias_version_script_version_script: J<"version-script=">,
   Alias<version_script>;
 
Index: lld/ELF/Symbols.cpp
===================================================================
--- lld/ELF/Symbols.cpp
+++ lld/ELF/Symbols.cpp
@@ -73,6 +73,8 @@
     return VA;
   }
   case SymbolBody::DefinedCommonKind:
+    if (Config->Relocatable && !Config->DefineCommon)
+      return 0;
     return In<ELFT>::Common->OutSec->Addr + In<ELFT>::Common->OutSecOff +
            cast<DefinedCommon>(Body).Offset;
   case SymbolBody::SharedKind: {
Index: lld/ELF/SyntheticSections.cpp
===================================================================
--- lld/ELF/SyntheticSections.cpp
+++ lld/ELF/SyntheticSections.cpp
@@ -59,6 +59,9 @@
                                        ArrayRef<uint8_t>(), "COMMON");
   Ret->Live = true;
 
+  if (Config->Relocatable && !Config->DefineCommon)
+    return Ret;
+
   // Sort the common symbols by alignment as an heuristic to pack them better.
   std::vector<DefinedCommon *> Syms = getCommonSymbols<ELFT>();
   std::stable_sort(Syms.begin(), Syms.end(),
@@ -1158,6 +1161,10 @@
       ESym->st_shndx = OutSec->SectionIndex;
     else if (isa<DefinedRegular<ELFT>>(Body))
       ESym->st_shndx = SHN_ABS;
+    else if (isa<DefinedCommon>(Body)) {
+      ESym->st_shndx = SHN_COMMON;
+      ESym->st_value = cast<DefinedCommon>(Body)->Alignment;
+    }
 
     if (Config->EMachine == EM_MIPS) {
       // On MIPS we need to mark symbol which has a PLT entry and requires
@@ -1189,6 +1196,8 @@
     break;
   }
   case SymbolBody::DefinedCommonKind:
+    if (Config->Relocatable && !Config->DefineCommon)
+      return nullptr;
     return In<ELFT>::Common->OutSec;
   case SymbolBody::SharedKind: {
     auto &SS = cast<SharedSymbol<ELFT>>(*Sym);
Index: lld/test/ELF/relocatable-common.s
===================================================================
--- lld/test/ELF/relocatable-common.s
+++ lld/test/ELF/relocatable-common.s
@@ -0,0 +1,34 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t1.o
+# RUN: ld.lld -r %t1.o -o %t
+# RUN: llvm-readobj -symbols -r %t | FileCheck %s
+# RUN: ld.lld -r --define-common %t1.o -o %t
+# RUN: llvm-readobj -symbols -r %t | FileCheck -check-prefix=DEFCOMM %s
+# RUN: ld.lld -r -d %t1.o -o %t
+# RUN: llvm-readobj -symbols -r %t | FileCheck -check-prefix=DEFCOMM %s
+# RUN: ld.lld -r -dc %t1.o -o %t
+# RUN: llvm-readobj -symbols -r %t | FileCheck -check-prefix=DEFCOMM %s
+# RUN: ld.lld -r -dp %t1.o -o %t
+# RUN: llvm-readobj -symbols -r %t | FileCheck -check-prefix=DEFCOMM %s
+
+# CHECK:        Symbol {
+# CHECK:          Name: common (1)
+# CHECK-NEXT:     Value: 0x4
+# CHECK-NEXT:     Size: 4
+# CHECK-NEXT:     Binding: Global (0x1)
+# CHECK-NEXT:     Type: Object (0x1)
+# CHECK-NEXT:     Other: 0
+# CHECK-NEXT:     Section: Common (0xFFF2)
+# CHECK-NEXT:   }
+
+# DEFCOMM:      Symbol {
+# DEFCOMM:        Name: common (1)
+# DEFCOMM-NEXT:   Value: 0x0
+# DEFCOMM-NEXT:   Size: 4
+# DEFCOMM-NEXT:   Binding: Global (0x1)
+# DEFCOMM-NEXT:   Type: Object (0x1)
+# DEFCOMM-NEXT:   Other: 0
+# DEFCOMM-NEXT:   Section: COMMON (0x2)
+# DEFCOMM-NEXT: }
+
+.comm common,4,4