Index: include/llvm/BinaryFormat/Wasm.h
===================================================================
--- include/llvm/BinaryFormat/Wasm.h
+++ include/llvm/BinaryFormat/Wasm.h
@@ -313,6 +313,7 @@
 const unsigned WASM_SYMBOL_UNDEFINED = 0x10;
 const unsigned WASM_SYMBOL_EXPORTED = 0x20;
 const unsigned WASM_SYMBOL_EXPLICIT_NAME = 0x40;
+const unsigned WASM_SYMBOL_NO_STRIP = 0x80;
 
 #define WASM_RELOC(name, value) name = value,
 
Index: include/llvm/MC/MCSymbolWasm.h
===================================================================
--- include/llvm/MC/MCSymbolWasm.h
+++ include/llvm/MC/MCSymbolWasm.h
@@ -47,11 +47,11 @@
   wasm::WasmSymbolType getType() const { return Type; }
   void setType(wasm::WasmSymbolType type) { Type = type; }
 
-  bool isExported() const {
-    return getFlags() & wasm::WASM_SYMBOL_EXPORTED;
+  bool isNoStrip() const {
+    return getFlags() & wasm::WASM_SYMBOL_NO_STRIP;
   }
-  void setExported() const {
-    modifyFlags(wasm::WASM_SYMBOL_EXPORTED, wasm::WASM_SYMBOL_EXPORTED);
+  void setNoStrip() const {
+    modifyFlags(wasm::WASM_SYMBOL_NO_STRIP, wasm::WASM_SYMBOL_NO_STRIP);
   }
 
   bool isWeak() const { return IsWeak; }
Index: include/llvm/MC/MCWasmObjectWriter.h
===================================================================
--- include/llvm/MC/MCWasmObjectWriter.h
+++ include/llvm/MC/MCWasmObjectWriter.h
@@ -20,9 +20,10 @@
 
 class MCWasmObjectTargetWriter : public MCObjectTargetWriter {
   const unsigned Is64Bit : 1;
+  const unsigned IsEmscripten : 1;
 
 protected:
-  explicit MCWasmObjectTargetWriter(bool Is64Bit_);
+  explicit MCWasmObjectTargetWriter(bool Is64Bit_, bool IsEmscripten);
 
 public:
   virtual ~MCWasmObjectTargetWriter();
@@ -38,6 +39,7 @@
   /// \name Accessors
   /// @{
   bool is64Bit() const { return Is64Bit; }
+  bool isEmscripten() const { return IsEmscripten; }
   /// @}
 };
 
Index: lib/MC/MCWasmObjectTargetWriter.cpp
===================================================================
--- lib/MC/MCWasmObjectTargetWriter.cpp
+++ lib/MC/MCWasmObjectTargetWriter.cpp
@@ -10,8 +10,9 @@
 
 using namespace llvm;
 
-MCWasmObjectTargetWriter::MCWasmObjectTargetWriter(bool Is64Bit)
-    : Is64Bit(Is64Bit) {}
+MCWasmObjectTargetWriter::MCWasmObjectTargetWriter(bool Is64Bit,
+                                                   bool IsEmscripten)
+    : Is64Bit(Is64Bit), IsEmscripten(IsEmscripten) {}
 
 // Pin the vtable to this object file
 MCWasmObjectTargetWriter::~MCWasmObjectTargetWriter() = default;
Index: lib/MC/MCWasmStreamer.cpp
===================================================================
--- lib/MC/MCWasmStreamer.cpp
+++ lib/MC/MCWasmStreamer.cpp
@@ -122,7 +122,7 @@
     break;
 
   case MCSA_NoDeadStrip:
-    Symbol->setExported();
+    Symbol->setNoStrip();
     break;
 
   default:
Index: lib/MC/WasmObjectWriter.cpp
===================================================================
--- lib/MC/WasmObjectWriter.cpp
+++ lib/MC/WasmObjectWriter.cpp
@@ -270,6 +270,7 @@
 
   // TargetObjectWriter wrappers.
   bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
+  bool isEmscripten() const { return TargetObjectWriter->isEmscripten(); }
 
   void startSection(SectionBookkeeping &Section, unsigned SectionId);
   void startCustomSection(SectionBookkeeping &Section, StringRef Name);
@@ -1486,8 +1487,12 @@
       Flags |= wasm::WASM_SYMBOL_BINDING_LOCAL;
     if (WS.isUndefined())
       Flags |= wasm::WASM_SYMBOL_UNDEFINED;
-    if (WS.isExported())
-      Flags |= wasm::WASM_SYMBOL_EXPORTED;
+    if (WS.isNoStrip()) {
+      Flags |= wasm::WASM_SYMBOL_NO_STRIP;
+      if (isEmscripten()) {
+        Flags |= wasm::WASM_SYMBOL_EXPORTED;
+      }
+    }
     if (WS.getName() != WS.getImportName())
       Flags |= wasm::WASM_SYMBOL_EXPLICIT_NAME;
 
Index: lib/ObjectYAML/WasmYAML.cpp
===================================================================
--- lib/ObjectYAML/WasmYAML.cpp
+++ lib/ObjectYAML/WasmYAML.cpp
@@ -535,6 +535,7 @@
   BCaseMask(UNDEFINED, UNDEFINED);
   BCaseMask(EXPORTED, EXPORTED);
   BCaseMask(EXPLICIT_NAME, EXPLICIT_NAME);
+  BCaseMask(NO_STRIP, NO_STRIP);
 #undef BCaseMask
 }
 
Index: lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp
===================================================================
--- lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp
+++ lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp
@@ -31,10 +31,12 @@
 
 class WebAssemblyAsmBackend final : public MCAsmBackend {
   bool Is64Bit;
+  bool IsEmscripten;
 
 public:
-  explicit WebAssemblyAsmBackend(bool Is64Bit)
-      : MCAsmBackend(support::little), Is64Bit(Is64Bit) {}
+  explicit WebAssemblyAsmBackend(bool Is64Bit, bool IsEmscripten)
+      : MCAsmBackend(support::little), Is64Bit(Is64Bit),
+        IsEmscripten(IsEmscripten) {}
 
   unsigned getNumFixupKinds() const override {
     return WebAssembly::NumTargetFixupKinds;
@@ -123,11 +125,11 @@
 
 std::unique_ptr<MCObjectTargetWriter>
 WebAssemblyAsmBackend::createObjectTargetWriter() const {
-  return createWebAssemblyWasmObjectWriter(Is64Bit);
+  return createWebAssemblyWasmObjectWriter(Is64Bit, IsEmscripten);
 }
 
 } // end anonymous namespace
 
 MCAsmBackend *llvm::createWebAssemblyAsmBackend(const Triple &TT) {
-  return new WebAssemblyAsmBackend(TT.isArch64Bit());
+  return new WebAssemblyAsmBackend(TT.isArch64Bit(), TT.isOSEmscripten());
 }
Index: lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
===================================================================
--- lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
+++ lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
@@ -38,7 +38,7 @@
 MCAsmBackend *createWebAssemblyAsmBackend(const Triple &TT);
 
 std::unique_ptr<MCObjectTargetWriter>
-createWebAssemblyWasmObjectWriter(bool Is64Bit);
+createWebAssemblyWasmObjectWriter(bool Is64Bit, bool IsEmscripten);
 
 namespace WebAssembly {
 enum OperandType {
Index: lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
===================================================================
--- lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
+++ lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
@@ -31,7 +31,7 @@
 namespace {
 class WebAssemblyWasmObjectWriter final : public MCWasmObjectTargetWriter {
 public:
-  explicit WebAssemblyWasmObjectWriter(bool Is64Bit);
+  explicit WebAssemblyWasmObjectWriter(bool Is64Bit, bool IsEmscripten);
 
 private:
   unsigned getRelocType(const MCValue &Target,
@@ -39,8 +39,9 @@
 };
 } // end anonymous namespace
 
-WebAssemblyWasmObjectWriter::WebAssemblyWasmObjectWriter(bool Is64Bit)
-    : MCWasmObjectTargetWriter(Is64Bit) {}
+WebAssemblyWasmObjectWriter::WebAssemblyWasmObjectWriter(bool Is64Bit,
+                                                         bool IsEmscripten)
+    : MCWasmObjectTargetWriter(Is64Bit, IsEmscripten) {}
 
 static const MCSection *getFixupSection(const MCExpr *Expr) {
   if (auto SyExp = dyn_cast<MCSymbolRefExpr>(Expr)) {
@@ -116,6 +117,6 @@
 }
 
 std::unique_ptr<MCObjectTargetWriter>
-llvm::createWebAssemblyWasmObjectWriter(bool Is64Bit) {
-  return llvm::make_unique<WebAssemblyWasmObjectWriter>(Is64Bit);
+llvm::createWebAssemblyWasmObjectWriter(bool Is64Bit, bool IsEmscripten) {
+  return llvm::make_unique<WebAssemblyWasmObjectWriter>(Is64Bit, IsEmscripten);
 }
Index: lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
===================================================================
--- lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
+++ lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
@@ -83,13 +83,22 @@
 // WebAssembly Lowering public interface.
 //===----------------------------------------------------------------------===//
 
-static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
+static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM,
+                                           const Triple &TT) {
   if (!RM.hasValue()) {
     // Default to static relocation model.  This should always be more optimial
     // than PIC since the static linker can determine all global addresses and
     // assume direct function calls.
     return Reloc::Static;
   }
+
+  if (!TT.isOSEmscripten()) {
+    // Relocation modes other than static are currently implemented in a way
+    // that only works for Emscripten, so disable them if we aren't targeting
+    // Emscripten.
+    return Reloc::Static;
+  }
+
   return *RM;
 }
 
@@ -102,7 +111,7 @@
     : LLVMTargetMachine(T,
                         TT.isArch64Bit() ? "e-m:e-p:64:64-i64:64-n32:64-S128"
                                          : "e-m:e-p:32:32-i64:64-n32:64-S128",
-                        TT, CPU, FS, Options, getEffectiveRelocModel(RM),
+                        TT, CPU, FS, Options, getEffectiveRelocModel(RM, TT),
                         getEffectiveCodeModel(CM, CodeModel::Large), OL),
       TLOF(new WebAssemblyTargetObjectFile()) {
   // WebAssembly type-checks instructions, but a noreturn function with a return
Index: test/CodeGen/WebAssembly/address-offsets.ll
===================================================================
--- test/CodeGen/WebAssembly/address-offsets.ll
+++ test/CodeGen/WebAssembly/address-offsets.ll
@@ -6,7 +6,7 @@
 ; a variety of circumstances.
 
 target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
-target triple = "wasm32-unknown-unknown"
+target triple = "wasm32-unknown-emscripten"
 
 @g = external global [0 x i32], align 4
 
Index: test/CodeGen/WebAssembly/call-pic.ll
===================================================================
--- test/CodeGen/WebAssembly/call-pic.ll
+++ test/CodeGen/WebAssembly/call-pic.ll
@@ -1,7 +1,7 @@
 ; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-keep-registers -relocation-model=pic -fast-isel=1 | FileCheck %s
 ; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-keep-registers -relocation-model=pic -fast-isel=0 | FileCheck %s
 target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
-target triple = "wasm32-unknown-unknown"
+target triple = "wasm32-unknown-emscripten"
 
 declare i32 @foo()
 declare i32 @bar()
Index: test/CodeGen/WebAssembly/load-store-pic.ll
===================================================================
--- test/CodeGen/WebAssembly/load-store-pic.ll
+++ test/CodeGen/WebAssembly/load-store-pic.ll
@@ -6,7 +6,7 @@
 ; We test here both with and without fast-isel.
 
 target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
-target triple = "wasm32-unknown-unknown"
+target triple = "wasm32-unknown-emscripten"
 
 @hidden_global         = external hidden global i32
 @hidden_global_array   = external hidden global [10 x i32]
Index: test/MC/WebAssembly/no-dead-strip.ll
===================================================================
--- test/MC/WebAssembly/no-dead-strip.ll
+++ test/MC/WebAssembly/no-dead-strip.ll
@@ -13,8 +13,8 @@
 ; CHECK-NEXT:   Symbol {
 ; CHECK-NEXT:     Name: foo
 ; CHECK-NEXT:     Type: FUNCTION (0x0)
-; CHECK-NEXT:     Flags [ (0x20)
-; CHECK-NEXT:       EXPORTED (0x20)
+; CHECK-NEXT:     Flags [ (0x80)
+; CHECK-NEXT:       NO_STRIP (0x80)
 ; CHECK-NEXT:     ]
 ; CHECK-NEXT:     ElementIndex: 0x0
 ; CHECK-NEXT:   }
Index: tools/llvm-readobj/WasmDumper.cpp
===================================================================
--- tools/llvm-readobj/WasmDumper.cpp
+++ tools/llvm-readobj/WasmDumper.cpp
@@ -51,6 +51,7 @@
   ENUM_ENTRY(UNDEFINED),
   ENUM_ENTRY(EXPORTED),
   ENUM_ENTRY(EXPLICIT_NAME),
+  ENUM_ENTRY(NO_STRIP),
 #undef ENUM_ENTRY
 };