Index: ELF/Config.h
===================================================================
--- ELF/Config.h
+++ ELF/Config.h
@@ -65,6 +65,7 @@
   bool EhFrameHdr;
   bool EnableNewDtags;
   bool ExportDynamic;
+  bool Fast;
   bool GcSections;
   bool GnuHash = false;
   bool ICF;
Index: ELF/Driver.cpp
===================================================================
--- ELF/Driver.cpp
+++ ELF/Driver.cpp
@@ -323,6 +323,7 @@
   Config->EhFrameHdr = Args.hasArg(OPT_eh_frame_hdr);
   Config->EnableNewDtags = !Args.hasArg(OPT_disable_new_dtags);
   Config->ExportDynamic = Args.hasArg(OPT_export_dynamic);
+  Config->Fast = Args.hasArg(OPT_fast);
   Config->GcSections = Args.hasArg(OPT_gc_sections);
   Config->ICF = Args.hasArg(OPT_icf);
   Config->NoGnuUnique = Args.hasArg(OPT_no_gnu_unique);
Index: ELF/InputFiles.cpp
===================================================================
--- ELF/InputFiles.cpp
+++ ELF/InputFiles.cpp
@@ -143,6 +143,12 @@
 
 template <class ELFT> static bool shouldMerge(const typename ELFT::Shdr &Sec) {
   typedef typename ELFT::uint uintX_t;
+
+  // In fast link mode, we don't merge sections. This makes the linker
+  // about 2x faster, while it will make it produce larger output.
+  if (Config->Fast)
+    return false;
+
   uintX_t Flags = Sec.sh_flags;
   if (!(Flags & SHF_MERGE))
     return false;
Index: ELF/Options.td
===================================================================
--- ELF/Options.td
+++ ELF/Options.td
@@ -65,6 +65,9 @@
 def export_dynamic_symbol : Separate<["--", "-"], "export-dynamic-symbol">,
   HelpText<"Put a symbol in the dynamic symbol table">;
 
+def fast: Flag<["--", "-"], "fast">,
+  HelpText<"Disable slow linker features; may produce larger output">;
+
 def fini : Separate<["-"], "fini">, MetaVarName<"<symbol>">,
   HelpText<"Specify a finalizer function">;