Index: include/llvm/Object/Wasm.h
===================================================================
--- include/llvm/Object/Wasm.h
+++ include/llvm/Object/Wasm.h
@@ -43,9 +43,9 @@
   };
 
   WasmSymbol(StringRef Name, SymbolType Type, uint32_t Section,
-             uint32_t ElementIndex, uint32_t ImportIndex = 0)
+             uint32_t ElementIndex, uint32_t FunctionType = 0)
       : Name(Name), Type(Type), Section(Section), ElementIndex(ElementIndex),
-        ImportIndex(ImportIndex) {}
+        FunctionType(FunctionType) {}
 
   StringRef Name;
   SymbolType Type;
@@ -55,8 +55,18 @@
   // Index into either the function or global index space.
   uint32_t ElementIndex;
 
-  // For imports, the index into the import table
-  uint32_t ImportIndex;
+  // For function, the type index
+  uint32_t FunctionType;
+
+  // Symbols can be both exported and imported (in the case of the weakly
+  // defined symbol).  In this the import index is stored as AltIndex.
+  uint32_t AltIndex = 0;
+  bool HasAltIndex = false;
+
+  void setAltIndex(uint32_t Index) {
+    HasAltIndex = true;
+    AltIndex = Index;
+  }
 
   bool isFunction() const {
     return Type == WasmSymbol::SymbolType::FUNCTION_IMPORT ||
@@ -91,8 +101,7 @@
 
   void print(raw_ostream &Out) const {
     Out << "Name=" << Name << ", Type=" << static_cast<int>(Type)
-        << ", Flags=" << Flags << " ElemIndex=" << ElementIndex
-        << ", ImportIndex=" << ImportIndex;
+        << ", Flags=" << Flags << " ElemIndex=" << ElementIndex;
   }
 
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
Index: lib/MC/WasmObjectWriter.cpp
===================================================================
--- lib/MC/WasmObjectWriter.cpp
+++ lib/MC/WasmObjectWriter.cpp
@@ -1116,7 +1116,7 @@
       continue;
 
     // If the symbol is not defined in this translation unit, import it.
-    if (!WS.isDefined(/*SetUsed=*/false)) {
+    if (!WS.isDefined(/*SetUsed=*/false) || WS.isVariable()) {
       WasmImport Import;
       Import.ModuleName = WS.getModuleName();
       Import.FieldName = WS.getName();
@@ -1289,7 +1289,7 @@
     uint32_t Index = SymbolIndices.find(ResolvedSym)->second;
     DEBUG(dbgs() << "  -> index:" << Index << "\n");
 
-    SymbolIndices[&WS] = Index;
+    //SymbolIndices[&WS] = Index;
     WasmExport Export;
     Export.FieldName = WS.getName();
     Export.Index = Index;
Index: lib/Object/WasmObjectFile.cpp
===================================================================
--- lib/Object/WasmObjectFile.cpp
+++ lib/Object/WasmObjectFile.cpp
@@ -303,7 +303,6 @@
 
 void WasmObjectFile::populateSymbolTable() {
   // Add imports to symbol table
-  size_t ImportIndex = 0;
   size_t GlobalIndex = 0;
   size_t FunctionIndex = 0;
   for (const wasm::WasmImport& Import : Imports) {
@@ -312,7 +311,7 @@
       assert(Import.Global.Type == wasm::WASM_TYPE_I32);
       SymbolMap.try_emplace(Import.Field, Symbols.size());
       Symbols.emplace_back(Import.Field, WasmSymbol::SymbolType::GLOBAL_IMPORT,
-                           ImportSection, GlobalIndex++, ImportIndex);
+                           ImportSection, GlobalIndex++);
       DEBUG(dbgs() << "Adding import: " << Symbols.back()
                    << " sym index:" << Symbols.size() << "\n");
       break;
@@ -320,14 +319,13 @@
       SymbolMap.try_emplace(Import.Field, Symbols.size());
       Symbols.emplace_back(Import.Field,
                            WasmSymbol::SymbolType::FUNCTION_IMPORT,
-                           ImportSection, FunctionIndex++, ImportIndex);
+                           ImportSection, FunctionIndex++, Import.SigIndex);
       DEBUG(dbgs() << "Adding import: " << Symbols.back()
                    << " sym index:" << Symbols.size() << "\n");
       break;
     default:
       break;
     }
-    ImportIndex++;
   }
 
   // Add exports to symbol table
@@ -338,11 +336,22 @@
           Export.Kind == wasm::WASM_EXTERNAL_FUNCTION
               ? WasmSymbol::SymbolType::FUNCTION_EXPORT
               : WasmSymbol::SymbolType::GLOBAL_EXPORT;
-      SymbolMap.try_emplace(Export.Name, Symbols.size());
-      Symbols.emplace_back(Export.Name, ExportType,
-                           ExportSection, Export.Index);
-      DEBUG(dbgs() << "Adding export: " << Symbols.back()
-                   << " sym index:" << Symbols.size() << "\n");
+      auto Pair = SymbolMap.try_emplace(Export.Name, Symbols.size());
+      if (Pair.second) {
+        Symbols.emplace_back(Export.Name, ExportType,
+                             ExportSection, Export.Index);
+        DEBUG(dbgs() << "Adding export: " << Symbols.back()
+                     << " sym index:" << Symbols.size() << "\n");
+      } else {
+        uint32_t SymIndex = Pair.first->second;
+        const WasmSymbol &OldSym = Symbols[SymIndex];
+        WasmSymbol NewSym(Export.Name, ExportType, ExportSection, Export.Index);
+        NewSym.setAltIndex(OldSym.ElementIndex);
+        Symbols[SymIndex] = NewSym;
+
+        DEBUG(dbgs() << "Replacing existing symbol:  " << NewSym
+                     << " sym index:" << SymIndex << "\n");
+      }
     }
   }
 }