Index: wasm/Config.h
===================================================================
--- wasm/Config.h
+++ wasm/Config.h
@@ -25,6 +25,7 @@
   bool GcSections;
   bool ImportMemory;
   bool ImportTable;
+  bool MergeDataSegments;
   bool PrintGcSections;
   bool Relocatable;
   bool StripAll;
Index: wasm/Driver.cpp
===================================================================
--- wasm/Driver.cpp
+++ wasm/Driver.cpp
@@ -293,6 +293,9 @@
   Config->Relocatable = Args.hasArg(OPT_relocatable);
   Config->GcSections =
       Args.hasFlag(OPT_gc_sections, OPT_no_gc_sections, !Config->Relocatable);
+  Config->MergeDataSegments =
+      Args.hasFlag(OPT_merge_data_segments, OPT_no_merge_data_segments,
+                   !Config->Relocatable);
   Config->PrintGcSections =
       Args.hasFlag(OPT_print_gc_sections, OPT_no_print_gc_sections, false);
   Config->SearchPaths = args::getStrings(Args, OPT_L);
Index: wasm/Options.td
===================================================================
--- wasm/Options.td
+++ wasm/Options.td
@@ -40,6 +40,10 @@
     "Enable garbage collection of unused sections",
     "Disable garbage collection of unused sections">;
 
+defm merge_data_segments: B<"merge-data-segments",
+    "Enable merging data segments",
+    "Disable merging data segments">;
+
 def help: F<"help">, HelpText<"Print option help">;
 
 def l: JoinedOrSeparate<["-"], "l">, MetaVarName<"<libName>">,
Index: wasm/Writer.cpp
===================================================================
--- wasm/Writer.cpp
+++ wasm/Writer.cpp
@@ -870,19 +870,33 @@
 }
 
 void Writer::createOutputSegments() {
-  for (ObjFile *File : Symtab->ObjectFiles) {
-    for (InputSegment *Segment : File->Segments) {
-      if (!Segment->Live)
-        continue;
-      StringRef Name = getOutputDataSegmentName(Segment->getName());
-      OutputSegment *&S = SegmentMap[Name];
-      if (S == nullptr) {
-        DEBUG(dbgs() << "new segment: " << Name << "\n");
-        S = make<OutputSegment>(Name, Segments.size());
+  if (!Config->MergeDataSegments) {
+    for (ObjFile *File : Symtab->ObjectFiles) {
+      for (InputSegment *Segment : File->Segments) {
+        if (!Segment->Live)
+          continue;
+        StringRef Name = getOutputDataSegmentName(Segment->getName());
+        OutputSegment *S = make<OutputSegment>(Name, Segments.size());
         Segments.push_back(S);
+        S->addInputSegment(Segment);
+        DEBUG(dbgs() << "added data: " << Name << ": " << S->Size << "\n");
+      }
+    }
+  } else {
+    for (ObjFile *File : Symtab->ObjectFiles) {
+      for (InputSegment *Segment : File->Segments) {
+        if (!Segment->Live)
+          continue;
+        StringRef Name = getOutputDataSegmentName(Segment->getName());
+        OutputSegment *&S = SegmentMap[Name];
+        if (S == nullptr) {
+          DEBUG(dbgs() << "new segment: " << Name << "\n");
+          S = make<OutputSegment>(Name, Segments.size());
+          Segments.push_back(S);
+        }
+        S->addInputSegment(Segment);
+        DEBUG(dbgs() << "added data: " << Name << ": " << S->Size << "\n");
       }
-      S->addInputSegment(Segment);
-      DEBUG(dbgs() << "added data: " << Name << ": " << S->Size << "\n");
     }
   }
 }