Index: COFF/Config.h
===================================================================
--- COFF/Config.h
+++ COFF/Config.h
@@ -189,6 +189,7 @@
   bool MinGW = false;
   bool WarnLocallyDefinedImported = true;
   bool Incremental = true;
+  bool KillAt = false;
 };
 
 extern Configuration *Config;
Index: COFF/Driver.cpp
===================================================================
--- COFF/Driver.cpp
+++ COFF/Driver.cpp
@@ -1072,6 +1072,10 @@
   if (Args.hasArg(OPT_lldsavetemps))
     Config->SaveTemps = true;
 
+  // Handle /kill-at
+  if (Args.hasArg(OPT_kill_at))
+    Config->KillAt = true;
+
   // Handle /lldltocache
   if (auto *Arg = Args.getLastArg(OPT_lldltocache))
     Config->LTOCache = Arg->getValue();
Index: COFF/DriverUtils.cpp
===================================================================
--- COFF/DriverUtils.cpp
+++ COFF/DriverUtils.cpp
@@ -582,6 +582,23 @@
   return Sym.startswith("_") ? Sym.substr(1) : Sym;
 }
 
+// Convert stdcall/fastcall style symbols into unsuffixed symbols,
+// with or without a leading underscore.
+static StringRef killAt(StringRef Sym, bool Prefix) {
+  if (Sym.empty())
+    return Sym;
+  // Strip any trailing stdcall suffix
+  Sym = Sym.substr(0, Sym.find('@', 1));
+  if (Sym.startswith("@")) {
+    // For fastcall, remove the leading @ and replace it with an
+    // underscore, if prefixes are used.
+    Sym = Sym.substr(1);
+    if (Prefix)
+      Sym = Saver.save("_" + Sym);
+  }
+  return Sym;
+}
+
 // Performs error checking on all /export arguments.
 // It also sets ordinals.
 void fixupExports() {
@@ -614,6 +631,15 @@
     }
   }
 
+  if (Config->KillAt && Config->Machine == I386) {
+    for (Export &E : Config->Exports) {
+      E.Name = killAt(E.Name, true);
+      E.ExportName = killAt(E.ExportName, false);
+      E.ExtName = killAt(E.ExtName, true);
+      E.SymbolName = killAt(E.SymbolName, true);
+    }
+  }
+
   // Uniquefy by name.
   DenseMap<StringRef, Export *> Map(Config->Exports.size());
   std::vector<Export> V;
Index: COFF/Options.td
===================================================================
--- COFF/Options.td
+++ COFF/Options.td
@@ -126,6 +126,7 @@
 def debug_ghash : F<"debug:ghash">;
 def debug_dwarf : F<"debug:dwarf">;
 def export_all_symbols : F<"export-all-symbols">;
+def kill_at : F<"kill-at">;
 def lldmingw : F<"lldmingw">;
 def msvclto : F<"msvclto">;
 def output_def : Joined<["/", "-"], "output-def:">;
Index: MinGW/Driver.cpp
===================================================================
--- MinGW/Driver.cpp
+++ MinGW/Driver.cpp
@@ -154,6 +154,8 @@
     Add("-debug:dwarf");
   if (Args.hasArg(OPT_large_address_aware))
     Add("-largeaddressaware");
+  if (Args.hasArg(OPT_kill_at))
+    Add("-kill-at");
 
   if (Args.getLastArgValue(OPT_m) != "thumb2pe" &&
       Args.getLastArgValue(OPT_m) != "arm64pe" && !Args.hasArg(OPT_dynamicbase))
Index: MinGW/Options.td
===================================================================
--- MinGW/Options.td
+++ MinGW/Options.td
@@ -14,6 +14,7 @@
 def gc_sections: F<"gc-sections">, HelpText<"Remove unused sections">;
 def icf: J<"icf=">, HelpText<"Identical code folding">;
 def image_base: S<"image-base">, HelpText<"Base address of the program">;
+def kill_at: F<"kill-at">, HelpText<"Remove @n from exported symbols">;
 def l: JoinedOrSeparate<["-"], "l">, MetaVarName<"<libName>">,
   HelpText<"Root name of library to use">;
 def m: JoinedOrSeparate<["-"], "m">, HelpText<"Set target emulation">;
Index: test/COFF/def-export-stdcall.s
===================================================================
--- test/COFF/def-export-stdcall.s
+++ test/COFF/def-export-stdcall.s
@@ -59,6 +59,24 @@
 # DECORATED-MINGW-EXPORTS: Name: @fastcall@8
 # DECORATED-MINGW-EXPORTS: Name: stdcall@8
 
+# RUN: lld-link -lldmingw -kill-at -entry:dllmain -dll -def:%t.deco-mingw.def %t.obj -out:%t.dll -implib:%t.lib
+# RUN: llvm-readobj %t.lib | FileCheck -check-prefix MINGW-KILL-AT-IMPLIB %s
+# RUN: llvm-readobj -coff-exports %t.dll | FileCheck -check-prefix MINGW-KILL-AT-EXPORTS %s
+
+# RUN: lld-link -lldmingw -kill-at -entry:dllmain -dll %t.obj -out:%t.dll -implib:%t.lib
+# RUN: llvm-readobj %t.lib | FileCheck -check-prefix MINGW-KILL-AT-IMPLIB %s
+# RUN: llvm-readobj -coff-exports %t.dll | FileCheck -check-prefix MINGW-KILL-AT-EXPORTS %s
+
+# MINGW-KILL-AT-IMPLIB: Name type: noprefix
+# MINGW-KILL-AT-IMPLIB: __imp__fastcall
+# MINGW-KILL-AT-IMPLIB-NEXT: _fastcall
+# MINGW-KILL-AT-IMPLIB: Name type: noprefix
+# MINGW-KILL-AT-IMPLIB-NEXT: __imp__stdcall
+# MINGW-KILL-AT-IMPLIB-NEXT: _stdcall
+
+# MINGW-KILL-AT-EXPORTS: Name: fastcall
+# MINGW-KILL-AT-EXPORTS: Name: stdcall
+
 
         .def     _stdcall@8;
         .scl    2;
Index: test/MinGW/driver.test
===================================================================
--- test/MinGW/driver.test
+++ test/MinGW/driver.test
@@ -126,3 +126,7 @@
 ICF: -opt:icf
 
 RUN: ld.lld -### -m i386pep --start-group foo.o --end-group
+
+RUN: ld.lld -### foo.o -m i386pe -shared --kill-at | FileCheck -check-prefix=KILL-AT %s
+RUN: ld.lld -### foo.o -m i386pe -shared -kill-at | FileCheck -check-prefix=KILL-AT %s
+KILL-AT: -kill-at