Index: llvm/test/tools/dsymutil/X86/accelerator.test
===================================================================
--- /dev/null
+++ llvm/test/tools/dsymutil/X86/accelerator.test
@@ -0,0 +1,38 @@
+RUN: dsymutil -accelerator=Dwarf -oso-prepend-path=%p/.. %p/../Inputs/basic.macho.x86_64 -o %t.dwarf.dSYM
+RUN: dsymutil -accelerator=Apple -oso-prepend-path=%p/.. %p/../Inputs/basic.macho.x86_64 -o %t.apple.dSYM
+
+RUN: llvm-dwarfdump -verify %t.dwarf.dSYM
+RUN: llvm-dwarfdump -verify %t.apple.dSYM
+
+RUN: llvm-dwarfdump -debug-names %t.dwarf.dSYM | FileCheck %s -check-prefix=NAMES -check-prefix=DWARF
+RUN: llvm-dwarfdump -apple-names -apple-namespaces -apple-types %t.apple.dSYM | FileCheck %s -check-prefix=NAMES -check-prefix=APPLE
+
+RUN: dsymutil -update -accelerator=Dwarf %t.apple.dSYM -o %t.dwarf.updated.dSYM
+RUN: dsymutil -update -accelerator=Apple %t.dwarf.dSYM -o %t.apple.updated.dSYM
+
+RUN: llvm-dwarfdump -verify %t.dwarf.updated.dSYM
+RUN: llvm-dwarfdump -verify %t.apple.updated.dSYM
+
+RUN: llvm-dwarfdump -debug-names %t.dwarf.updated.dSYM | FileCheck %s -check-prefix=NAMES -check-prefix=DWARF
+RUN: llvm-dwarfdump -apple-names -apple-namespaces -apple-types %t.apple.updated.dSYM | FileCheck %s -check-prefix=NAMES -check-prefix=APPLE
+
+DWARF: .debug_names contents:
+DWARF: Compilation Unit offsets [
+DWARF:   CU[0]
+DWARF:   CU[1]
+DWARF:   CU[2]
+DWARF: ]
+
+APPLE-DAG: .apple_names contents:
+APPLE-DAG: .apple_types contents:
+APPLE-DAG: .apple_namespaces contents:
+
+NAMES-DAG: "private_int"
+NAMES-DAG: "baz"
+NAMES-DAG: "int"
+NAMES-DAG: "bar"
+NAMES-DAG: "foo"
+NAMES-DAG: "inc"
+NAMES-DAG: "val"
+NAMES-DAG: "main"
+NAMES-DAG: "char"
Index: llvm/test/tools/dsymutil/cmdline.test
===================================================================
--- llvm/test/tools/dsymutil/cmdline.test
+++ llvm/test/tools/dsymutil/cmdline.test
@@ -5,6 +5,7 @@
 HELP: Color Options
 HELP: -color
 HELP: Specific Options:
+HELP: -accelerator
 HELP: -arch=<arch>
 HELP: -dump-debug-map
 HELP: -flat
Index: llvm/tools/dsymutil/DwarfLinker.h
===================================================================
--- llvm/tools/dsymutil/DwarfLinker.h
+++ llvm/tools/dsymutil/DwarfLinker.h
@@ -411,6 +411,8 @@
 
   /// Emit the accelerator entries for \p Unit.
   void emitAcceleratorEntriesForUnit(CompileUnit &Unit);
+  void emitDwarfAcceleratorEntriesForUnit(CompileUnit &Unit);
+  void emitAppleAcceleratorEntriesForUnit(CompileUnit &Unit);
 
   /// Patch the frame info for an object file and emit it.
   void patchFrameInfoForObject(const DebugMapObject &, RangesTy &Ranges,
@@ -461,6 +463,7 @@
   uint32_t LastCIEOffset = 0;
 
   /// Apple accelerator tables.
+  AccelTable<DWARF5AccelTableStaticData> DebugNames;
   AccelTable<AppleAccelTableStaticOffsetData> AppleNames;
   AccelTable<AppleAccelTableStaticOffsetData> AppleNamespaces;
   AccelTable<AppleAccelTableStaticOffsetData> AppleObjc;
Index: llvm/tools/dsymutil/DwarfLinker.cpp
===================================================================
--- llvm/tools/dsymutil/DwarfLinker.cpp
+++ llvm/tools/dsymutil/DwarfLinker.cpp
@@ -1746,6 +1746,17 @@
 }
 
 void DwarfLinker::emitAcceleratorEntriesForUnit(CompileUnit &Unit) {
+  switch (Options.TheAccelTableKind) {
+  case AccelTableKind::Apple:
+    emitAppleAcceleratorEntriesForUnit(Unit);
+    break;
+  case AccelTableKind::Dwarf:
+    emitDwarfAcceleratorEntriesForUnit(Unit);
+    break;
+  }
+}
+
+void DwarfLinker::emitAppleAcceleratorEntriesForUnit(CompileUnit &Unit) {
   // Add namespaces.
   for (const auto &Namespace : Unit.getNamespaces())
     AppleNamespaces.addName(Namespace.Name,
@@ -1774,6 +1785,18 @@
     AppleObjc.addName(ObjC.Name, ObjC.Die->getOffset() + Unit.getStartOffset());
 }
 
+void DwarfLinker::emitDwarfAcceleratorEntriesForUnit(CompileUnit &Unit) {
+  for (const auto &Namespace : Unit.getNamespaces())
+    DebugNames.addName(Namespace.Name, Namespace.Die->getOffset(),
+                       Namespace.Die->getTag(), Unit.getUniqueID());
+  for (const auto &Pubname : Unit.getPubnames())
+    DebugNames.addName(Pubname.Name, Pubname.Die->getOffset(),
+                       Pubname.Die->getTag(), Unit.getUniqueID());
+  for (const auto &Pubtype : Unit.getPubtypes())
+    DebugNames.addName(Pubtype.Name, Pubtype.Die->getOffset(),
+                       Pubtype.Die->getTag(), Unit.getUniqueID());
+}
+
 /// Read the frame info stored in the object, and emit the
 /// patched frame descriptions for the linked binary.
 ///
@@ -2444,10 +2467,17 @@
     if (!Options.NoOutput) {
       Streamer->emitAbbrevs(Abbreviations, MaxDwarfVersion);
       Streamer->emitStrings(OffsetsStringPool);
-      Streamer->emitAppleNames(AppleNames);
-      Streamer->emitAppleNamespaces(AppleNamespaces);
-      Streamer->emitAppleTypes(AppleTypes);
-      Streamer->emitAppleObjc(AppleObjc);
+      switch (Options.TheAccelTableKind) {
+      case AccelTableKind::Apple:
+        Streamer->emitAppleNames(AppleNames);
+        Streamer->emitAppleNamespaces(AppleNamespaces);
+        Streamer->emitAppleTypes(AppleTypes);
+        Streamer->emitAppleObjc(AppleObjc);
+        break;
+      case AccelTableKind::Dwarf:
+        Streamer->emitDebugNames(DebugNames);
+        break;
+      }
     }
   };
 
Index: llvm/tools/dsymutil/DwarfStreamer.h
===================================================================
--- llvm/tools/dsymutil/DwarfStreamer.h
+++ llvm/tools/dsymutil/DwarfStreamer.h
@@ -27,6 +27,7 @@
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/MCTargetOptions.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
@@ -121,6 +122,9 @@
   void emitFDE(uint32_t CIEOffset, uint32_t AddreSize, uint32_t Address,
                StringRef Bytes);
 
+  /// Emit DWARF debug names.
+  void emitDebugNames(AccelTable<DWARF5AccelTableStaticData> &Table);
+
   /// Emit Apple namespaces accelerator table.
   void emitAppleNamespaces(AccelTable<AppleAccelTableStaticOffsetData> &Table);
 
@@ -162,6 +166,9 @@
   uint32_t LineSectionSize;
   uint32_t FrameSectionSize;
 
+  /// Keep track of emitted CUs and their Unique ID.
+  std::vector<CompileUnit *> EmittedUnits;
+
   /// Emit the pubnames or pubtypes section contribution for \p
   /// Unit into \p Sec. The data is provided in \p Names.
   void emitPubSectionForUnit(MCSection *Sec, StringRef Name,
Index: llvm/tools/dsymutil/DwarfStreamer.cpp
===================================================================
--- llvm/tools/dsymutil/DwarfStreamer.cpp
+++ llvm/tools/dsymutil/DwarfStreamer.cpp
@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "DwarfStreamer.h"
+#include "CompileUnit.h"
 #include "LinkUtils.h"
 #include "MachOUtils.h"
 #include "llvm/ADT/Triple.h"
@@ -165,6 +166,9 @@
   // start of the section.
   Asm->emitInt32(0);
   Asm->emitInt8(Unit.getOrigUnit().getAddressByteSize());
+
+  // Remember this CU.
+  EmittedUnits.push_back(&Unit);
 }
 
 /// Emit the \p Abbrevs array as the shared abbreviation table
@@ -197,6 +201,30 @@
   }
 }
 
+void DwarfStreamer::emitDebugNames(
+    AccelTable<DWARF5AccelTableStaticData> &Table) {
+  if (EmittedUnits.empty())
+    return;
+
+  // Build up datastructures needed to emit this section.
+  std::vector<MCSymbol *> CompUnits;
+  DenseMap<unsigned, size_t> UniqueIdToCuMap;
+  unsigned Id = 0;
+  for (auto *CU : EmittedUnits) {
+    CompUnits.push_back(CU->getLabelBegin());
+    UniqueIdToCuMap[CU->getUniqueID()] = Id;
+    assert(CU->getUniqueID() == Id);
+    Id++;
+  }
+
+  Asm->OutStreamer->SwitchSection(MOFI->getDwarfDebugNamesSection());
+  emitDWARF5AccelTable(
+      Asm.get(), Table, CompUnits,
+      [&UniqueIdToCuMap](const DWARF5AccelTableStaticData &Entry) {
+        return UniqueIdToCuMap[Entry.getCUIndex()];
+      });
+}
+
 void DwarfStreamer::emitAppleNamespaces(
     AccelTable<AppleAccelTableStaticOffsetData> &Table) {
   Asm->OutStreamer->SwitchSection(MOFI->getDwarfAccelNamespaceSection());
Index: llvm/tools/dsymutil/LinkUtils.h
===================================================================
--- llvm/tools/dsymutil/LinkUtils.h
+++ llvm/tools/dsymutil/LinkUtils.h
@@ -22,6 +22,12 @@
   Assembly,
 };
 
+/// The kind of accelerator tables we should emit.
+enum class AccelTableKind {
+  Apple, ///< .apple_names, .apple_namespaces, .apple_types, .apple_objc.
+  Dwarf, ///< DWARF v5 .debug_names.
+};
+
 struct LinkOptions {
   /// Verbosity
   bool Verbose = false;
@@ -47,6 +53,9 @@
   // Output file type.
   OutputFileType FileType = OutputFileType::Object;
 
+  /// The accelerator table kind
+  AccelTableKind TheAccelTableKind;
+
   /// -oso-prepend-path
   std::string PrependPath;
 
Index: llvm/tools/dsymutil/dsymutil.cpp
===================================================================
--- llvm/tools/dsymutil/dsymutil.cpp
+++ llvm/tools/dsymutil/dsymutil.cpp
@@ -103,6 +103,12 @@
     init(false), cat(DsymCategory));
 static alias UpdateA("u", desc("Alias for --update"), aliasopt(Update));
 
+static cl::opt<AccelTableKind> AcceleratorTable(
+    "accelerator", cl::desc("Output accelerator tables."),
+    cl::values(clEnumValN(AccelTableKind::Apple, "Apple", "Apple"),
+               clEnumValN(AccelTableKind::Dwarf, "Dwarf", "DWARF")),
+    cl::init(AccelTableKind::Apple), cat(DsymCategory));
+
 static opt<unsigned> NumThreads(
     "num-threads",
     desc("Specifies the maximum number (n) of simultaneous threads to use\n"
@@ -326,6 +332,7 @@
   Options.Update = Update;
   Options.NoTimestamp = NoTimestamp;
   Options.PrependPath = OsoPrependPath;
+  Options.TheAccelTableKind = AcceleratorTable;
 
   if (Assembly)
     Options.FileType = OutputFileType::Assembly;