1 files changed, 10 insertions, 7 deletions
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 028c79f3ab6..58416a0334a 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1046,15 +1046,18 @@ void AsmPrinter::EmitFunctionBody() {
   // If the function is empty and the object file uses .subsections_via_symbols,
   // then we need to emit *something* to the function body to prevent the
   // labels from collapsing together.  Just emit a noop.
-  if ((MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode)) {
+  // Similarly, don't emit empty functions on Windows either. It can lead to
+  // duplicate entries (two functions with the same RVA) in the Guard CF Table
+  // after linking, causing the kernel not to load the binary:
+  // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
+  // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
+  const Triple &TT = TM.getTargetTriple();
+  if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
+                          (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
     MCInst Noop;
-    MF->getSubtarget().getInstrInfo()->getNoopForMachoTarget(Noop);
+    MF->getSubtarget().getInstrInfo()->getNoop(Noop);
     OutStreamer->AddComment("avoids zero-length function");
-
-    // Targets can opt-out of emitting the noop here by leaving the opcode
-    // unspecified.
-    if (Noop.getOpcode())
-      OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
+    OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
   }
 
   const Function *F = MF->getFunction();