diff --git a/clang/include/clang/Basic/CodeGenOptions.def b/clang/include/clang/Basic/CodeGenOptions.def
--- a/clang/include/clang/Basic/CodeGenOptions.def
+++ b/clang/include/clang/Basic/CodeGenOptions.def
@@ -32,6 +32,7 @@
                 llvm::DebugCompressionType::None)
 CODEGENOPT(RelaxELFRelocations, 1, 0) ///< -Wa,--mrelax-relocations
 CODEGENOPT(AsmVerbose        , 1, 0) ///< -dA, -fverbose-asm.
+CODEGENOPT(Dwarf64           , 1, 0) ///< -gdwarf64.
 CODEGENOPT(PreserveAsmComments, 1, 1) ///< -dA, -fno-preserve-as-comments.
 CODEGENOPT(AssumeSaneOperatorNew , 1, 1) ///< implicit __attribute__((malloc)) operator new
 CODEGENOPT(Autolink          , 1, 1) ///< -fno-autolink
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -2096,6 +2096,8 @@
   HelpText<"Generate source-level debug information with dwarf version 4">;
 def gdwarf_5 : Flag<["-"], "gdwarf-5">, Group<g_Group>,
   HelpText<"Generate source-level debug information with dwarf version 5">;
+def gdwarf64 : Flag<["-"], "gdwarf64">, Group<g_Group>, Flags<[CC1Option]>,
+  HelpText<"Generate DWARF64 debug information.">;
 
 def gcodeview : Flag<["-"], "gcodeview">,
   HelpText<"Generate CodeView debug information">,
diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -562,6 +562,7 @@
   Options.MCOptions.MCFatalWarnings = CodeGenOpts.FatalWarnings;
   Options.MCOptions.MCNoWarn = CodeGenOpts.NoWarn;
   Options.MCOptions.AsmVerbose = CodeGenOpts.AsmVerbose;
+  Options.MCOptions.Dwarf64 = CodeGenOpts.Dwarf64;
   Options.MCOptions.PreserveAsmComments = CodeGenOpts.PreserveAsmComments;
   Options.MCOptions.ABIName = TargetOpts.ABI;
   for (const auto &Entry : HSOpts.UserEntries)
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -4012,6 +4012,20 @@
   if (DebuggerTuning == llvm::DebuggerKind::SCE)
     CmdArgs.push_back("-dwarf-explicit-import");
 
+  if (Args.hasArg(options::OPT_gdwarf64)) {
+    const Arg *A = Args.getLastArg(options::OPT_gdwarf64);
+    const llvm::Triple &RawTriple = TC.getTriple();
+    const llvm::Triple &Triple = TC.getEffectiveTriple();
+    if (DWARFVersion < 3)
+      D.Diag(diag::err_drv_argument_only_allowed_with)
+          << A->getAsString(Args) << "-gdwarf-5, -gdwarf-4, -gdwarf-3";
+    else if (!RawTriple.isArch64Bit() || !Triple.isArch64Bit())
+      D.Diag(diag::err_drv_argument_only_allowed_with)
+          << A->getAsString(Args) << "64 bit architecutre";
+    else
+      CmdArgs.push_back("-gdwarf64");
+  }
+
   RenderDebugInfoCompressionArgs(Args, CmdArgs, D, TC);
 }
 
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -905,6 +905,7 @@
       Args.hasFlag(OPT_fcoverage_mapping, OPT_fno_coverage_mapping, false);
   Opts.DumpCoverageMapping = Args.hasArg(OPT_dump_coverage_mapping);
   Opts.AsmVerbose = !Args.hasArg(OPT_fno_verbose_asm);
+  Opts.Dwarf64 = Args.hasArg(OPT_gdwarf64);
   Opts.PreserveAsmComments = !Args.hasArg(OPT_fno_preserve_as_comments);
   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
diff --git a/clang/test/Driver/debug-options.c b/clang/test/Driver/debug-options.c
--- a/clang/test/Driver/debug-options.c
+++ b/clang/test/Driver/debug-options.c
@@ -374,4 +374,17 @@
 // RUN: %clang -### -fno-eliminate-unused-debug-types -g1 -c %s 2>&1 \
 // RUN:        | FileCheck -check-prefix=NO_DEBUG_UNUSED_TYPES %s
 // NO_DEBUG_UNUSED_TYPES: "-debug-info-kind={{limited|line-tables-only|standalone}}"
-// NO_DEBUG_UNUSED_TYPES-NOT: "-debug-info-kind=unused-types"
+// NO_DEBUG_U∏NUSED_TYPES-NOT: "-debug-info-kind=unused-types"
+//
+// RUN: %clang -### -gdwarf-5 -gdwarf64 %s 2>&1 | FileCheck -check-prefix=GDWARF64_ON %s
+// RUN: %clang -### -gdwarf-4 -gdwarf64 %s 2>&1 | FileCheck -check-prefix=GDWARF64_ON %s
+// RUN: %clang -### -gdwarf-3 -gdwarf64 %s 2>&1 | FileCheck -check-prefix=GDWARF64_ON %s
+// RUN: %clang -### -gdwarf-2 -gdwarf64 %s 2>&1 | FileCheck -check-prefix=GDWARF64_OFF %s
+// RUN: %clang -### -gdwarf-4 -gdwarf64 -target x86_64-linux-gnu %s 2>&1 \
+// RUN:       | FileCheck -check-prefix=GDWARF64_ON %s
+// RUN: %clang -### -gdwarf-4 -gdwarf64 -target i386-linux-gnu %s 2>&1 \
+// RUN:       | FileCheck -check-prefix=GDWARF64_32ARCH %s
+//
+// GDWARF64_ON:  "-gdwarf64"
+// GDWARF64_OFF:  error: invalid argument '-gdwarf64' only allowed with '-gdwarf-5, -gdwarf-4, -gdwarf-3'
+// GDWARF64_32ARCH: error: invalid argument '-gdwarf64' only allowed with '64 bit architecutre'
diff --git a/lld/test/COFF/lto-new-pass-manager.ll.obj b/lld/test/COFF/lto-new-pass-manager.ll.obj
new file mode 100644
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

literal 0
Hc$@<O00001