Index: lld/trunk/ELF/OutputSections.cpp
===================================================================
--- lld/trunk/ELF/OutputSections.cpp
+++ lld/trunk/ELF/OutputSections.cpp
@@ -31,8 +31,6 @@
 using namespace lld::elf;
 
 uint8_t Out::First;
-OutputSection *Out::Bss;
-OutputSection *Out::BssRelRo;
 OutputSection *Out::Opd;
 uint8_t *Out::OpdBuf;
 PhdrEntry *Out::TlsPhdr;
Index: lld/trunk/ELF/Relocations.cpp
===================================================================
--- lld/trunk/ELF/Relocations.cpp
+++ lld/trunk/ELF/Relocations.cpp
@@ -479,23 +479,20 @@
   // See if this symbol is in a read-only segment. If so, preserve the symbol's
   // memory protection by reserving space in the .bss.rel.ro section.
   bool IsReadOnly = isReadOnly<ELFT>(SS);
-  OutputSection *OSec = IsReadOnly ? Out::BssRelRo : Out::Bss;
-
-  // Create a SyntheticSection in Out to hold the .bss and the Copy Reloc.
-  auto *ISec =
-      make<CopyRelSection<ELFT>>(IsReadOnly, SS->getAlignment<ELFT>(), SymSize);
-  OSec->addSection(ISec);
+  BssSection *Sec = IsReadOnly ? In<ELFT>::BssRelRo : In<ELFT>::Bss;
+  uintX_t Off = Sec->reserveSpace(SS->getAlignment<ELFT>(), SymSize);
 
   // Look through the DSO's dynamic symbol table for aliases and create a
   // dynamic symbol for each one. This causes the copy relocation to correctly
   // interpose any aliases.
   for (SharedSymbol *Sym : getSymbolsAt<ELFT>(SS)) {
     Sym->NeedsCopy = true;
-    Sym->Section = ISec;
+    Sym->CopyRelSec = Sec;
+    Sym->CopyRelSecOff = Off;
     Sym->symbol()->IsUsedInRegularObj = true;
   }
 
-  In<ELFT>::RelaDyn->addReloc({Target->CopyRel, ISec, 0, false, SS, 0});
+  In<ELFT>::RelaDyn->addReloc({Target->CopyRel, Sec, Off, false, SS, 0});
 }
 
 template <class ELFT>
Index: lld/trunk/ELF/Symbols.h
===================================================================
--- lld/trunk/ELF/Symbols.h
+++ lld/trunk/ELF/Symbols.h
@@ -238,8 +238,9 @@
   // This field is a pointer to the symbol's version definition.
   const void *Verdef;
 
-  // Section is significant only when NeedsCopy is true.
-  InputSection *Section = nullptr;
+  // CopyRelSec and CopyRelSecOff are significant only when NeedsCopy is true.
+  InputSection *CopyRelSec;
+  size_t CopyRelSecOff;
 
 private:
   template <class ELFT> const typename ELFT::Sym &getSym() const {
Index: lld/trunk/ELF/Symbols.cpp
===================================================================
--- lld/trunk/ELF/Symbols.cpp
+++ lld/trunk/ELF/Symbols.cpp
@@ -106,7 +106,8 @@
   case SymbolBody::SharedKind: {
     auto &SS = cast<SharedSymbol>(Body);
     if (SS.NeedsCopy)
-      return SS.Section->OutSec->Addr + SS.Section->OutSecOff;
+      return SS.CopyRelSec->OutSec->Addr + SS.CopyRelSec->OutSecOff +
+             SS.CopyRelSecOff;
     if (SS.NeedsPltAddr)
       return Body.getPltVA<ELFT>();
     return 0;
@@ -207,7 +208,7 @@
 
   if (auto *S = dyn_cast<SharedSymbol>(this)) {
     if (S->NeedsCopy)
-      return S->Section->OutSec;
+      return S->CopyRelSec->OutSec;
     return nullptr;
   }
 
Index: lld/trunk/ELF/SyntheticSections.h
===================================================================
--- lld/trunk/ELF/SyntheticSections.h
+++ lld/trunk/ELF/SyntheticSections.h
@@ -153,16 +153,19 @@
   uint8_t *HashBuf;
 };
 
-// For each copy relocation, we create an instance of this class to
-// reserve space in .bss or .bss.rel.ro.
-template <class ELFT> class CopyRelSection final : public SyntheticSection {
-  typedef typename ELFT::uint uintX_t;
-
+// BssSection is used to reserve space for copy relocations. We create two
+// instances of this class for .bss and .bss.rel.ro. .bss is used for writable
+// symbols, and .bss.rel.ro is used for read-only symbols.
+class BssSection final : public SyntheticSection {
 public:
-  CopyRelSection(bool ReadOnly, uintX_t AddrAlign, size_t Size);
+  BssSection(StringRef Name);
   void writeTo(uint8_t *) override {}
+  bool empty() const override { return getSize() == 0; }
+  size_t reserveSpace(uint32_t Alignment, size_t Size);
   size_t getSize() const override { return Size; }
-  size_t Size;
+
+private:
+  size_t Size = 0;
 };
 
 template <class ELFT> class MipsGotSection final : public SyntheticSection {
@@ -759,6 +762,8 @@
 template <class ELFT> struct In {
   static InputSection *ARMAttributes;
   static BuildIdSection<ELFT> *BuildId;
+  static BssSection *Bss;
+  static BssSection *BssRelRo;
   static InputSection *Common;
   static DynamicSection<ELFT> *Dynamic;
   static StringTableSection<ELFT> *DynStrTab;
@@ -788,6 +793,8 @@
 };
 
 template <class ELFT> InputSection *In<ELFT>::ARMAttributes;
+template <class ELFT> BssSection *In<ELFT>::Bss;
+template <class ELFT> BssSection *In<ELFT>::BssRelRo;
 template <class ELFT> BuildIdSection<ELFT> *In<ELFT>::BuildId;
 template <class ELFT> InputSection *In<ELFT>::Common;
 template <class ELFT> DynamicSection<ELFT> *In<ELFT>::Dynamic;
Index: lld/trunk/ELF/SyntheticSections.cpp
===================================================================
--- lld/trunk/ELF/SyntheticSections.cpp
+++ lld/trunk/ELF/SyntheticSections.cpp
@@ -376,11 +376,14 @@
   HashFn(HashBuf, Hashes);
 }
 
-template <class ELFT>
-CopyRelSection<ELFT>::CopyRelSection(bool ReadOnly, uintX_t AddrAlign, size_t S)
-    : SyntheticSection(SHF_ALLOC, SHT_NOBITS, AddrAlign,
-                       ReadOnly ? ".bss.rel.ro" : ".bss"),
-      Size(S) {}
+BssSection::BssSection(StringRef Name)
+    : SyntheticSection(SHF_ALLOC | SHF_WRITE, SHT_NOBITS, 0, Name) {}
+
+size_t BssSection::reserveSpace(uint32_t Alignment, size_t Size) {
+  OutSec->updateAlignment(Alignment);
+  this->Size = alignTo(this->Size, Alignment) + Size;
+  return this->Size - Size;
+}
 
 template <class ELFT>
 void BuildIdSection<ELFT>::writeBuildId(ArrayRef<uint8_t> Buf) {
@@ -2307,11 +2310,6 @@
 template class elf::BuildIdSection<ELF64LE>;
 template class elf::BuildIdSection<ELF64BE>;
 
-template class elf::CopyRelSection<ELF32LE>;
-template class elf::CopyRelSection<ELF32BE>;
-template class elf::CopyRelSection<ELF64LE>;
-template class elf::CopyRelSection<ELF64BE>;
-
 template class elf::GotSection<ELF32LE>;
 template class elf::GotSection<ELF32BE>;
 template class elf::GotSection<ELF64LE>;
Index: lld/trunk/ELF/Writer.cpp
===================================================================
--- lld/trunk/ELF/Writer.cpp
+++ lld/trunk/ELF/Writer.cpp
@@ -111,8 +111,8 @@
   }
 
   for (StringRef V :
-       {".text.", ".rodata.", ".data.rel.ro.", ".data.", ".bss.",
-        ".init_array.", ".fini_array.", ".ctors.", ".dtors.", ".tbss.",
+       {".text.", ".rodata.", ".data.rel.ro.", ".data.", ".bss.rel.ro.",
+        ".bss.", ".init_array.", ".fini_array.", ".ctors.", ".dtors.", ".tbss.",
         ".gcc_except_table.", ".tdata.", ".ARM.exidx."}) {
     StringRef Prefix = V.drop_back();
     if (Name.startswith(V) || Name == Prefix)
@@ -330,10 +330,6 @@
 
   auto Add = [](InputSectionBase *Sec) { InputSections.push_back(Sec); };
 
-  // Create singleton output sections.
-  Out::Bss = make<OutputSection>(".bss", SHT_NOBITS, SHF_ALLOC | SHF_WRITE);
-  Out::BssRelRo =
-      make<OutputSection>(".bss.rel.ro", SHT_NOBITS, SHF_ALLOC | SHF_WRITE);
   In<ELFT>::DynStrTab = make<StringTableSection<ELFT>>(".dynstr", true);
   In<ELFT>::Dynamic = make<DynamicSection<ELFT>>();
   In<ELFT>::RelaDyn = make<RelocationSection<ELFT>>(
@@ -371,6 +367,11 @@
     Add(Common);
   }
 
+  In<ELFT>::Bss = make<BssSection>(".bss");
+  Add(In<ELFT>::Bss);
+  In<ELFT>::BssRelRo = make<BssSection>(".bss.rel.ro");
+  Add(In<ELFT>::BssRelRo);
+
   // Add MIPS-specific sections.
   bool HasDynSymTab =
       !Symtab<ELFT>::X->getSharedFiles().empty() || Config->pic() ||
@@ -620,7 +621,7 @@
     return true;
   if (In<ELFT>::Got && Sec == In<ELFT>::Got->OutSec)
     return true;
-  if (Sec == Out::BssRelRo)
+  if (Sec == In<ELFT>::BssRelRo->OutSec)
     return true;
 
   StringRef S = Sec->Name;
@@ -1170,14 +1171,15 @@
   // Dynamic section must be the last one in this list and dynamic
   // symbol table section (DynSymTab) must be the first one.
   applySynthetic<ELFT>(
-      {In<ELFT>::DynSymTab, In<ELFT>::GnuHashTab, In<ELFT>::HashTab,
-       In<ELFT>::SymTab,    In<ELFT>::ShStrTab,   In<ELFT>::StrTab,
-       In<ELFT>::VerDef,    In<ELFT>::DynStrTab,  In<ELFT>::GdbIndex,
-       In<ELFT>::Got,       In<ELFT>::MipsGot,    In<ELFT>::IgotPlt,
-       In<ELFT>::GotPlt,    In<ELFT>::RelaDyn,    In<ELFT>::RelaIplt,
-       In<ELFT>::RelaPlt,   In<ELFT>::Plt,        In<ELFT>::Iplt,
-       In<ELFT>::Plt,       In<ELFT>::EhFrameHdr, In<ELFT>::VerSym,
-       In<ELFT>::VerNeed,   In<ELFT>::Dynamic},
+      {In<ELFT>::DynSymTab,  In<ELFT>::Bss,      In<ELFT>::BssRelRo,
+       In<ELFT>::GnuHashTab, In<ELFT>::HashTab,  In<ELFT>::SymTab,
+       In<ELFT>::ShStrTab,   In<ELFT>::StrTab,   In<ELFT>::VerDef,
+       In<ELFT>::DynStrTab,  In<ELFT>::GdbIndex, In<ELFT>::Got,
+       In<ELFT>::MipsGot,    In<ELFT>::IgotPlt,  In<ELFT>::GotPlt,
+       In<ELFT>::RelaDyn,    In<ELFT>::RelaIplt, In<ELFT>::RelaPlt,
+       In<ELFT>::Plt,        In<ELFT>::Iplt,     In<ELFT>::Plt,
+       In<ELFT>::EhFrameHdr, In<ELFT>::VerSym,   In<ELFT>::VerNeed,
+       In<ELFT>::Dynamic},
       [](SyntheticSection *SS) { SS->finalizeContents(); });
 
   // Some architectures use small displacements for jump instructions.
@@ -1206,16 +1208,6 @@
 }
 
 template <class ELFT> void Writer<ELFT>::addPredefinedSections() {
-  // Add BSS sections.
-  auto Add = [=](OutputSection *Sec) {
-    if (!Sec->Sections.empty()) {
-      Sec->assignOffsets<ELFT>();
-      OutputSections.push_back(Sec);
-    }
-  };
-  Add(Out::Bss);
-  Add(Out::BssRelRo);
-
   // ARM ABI requires .ARM.exidx to be terminated by some piece of data.
   // We have the terminater synthetic section class. Add that at the end.
   auto *OS = dyn_cast_or_null<OutputSection>(findSection(".ARM.exidx"));