Index: COFF/Config.h
===================================================================
--- COFF/Config.h
+++ COFF/Config.h
@@ -144,6 +144,10 @@
   // Used for /lldmap.
   std::string MapFile;
 
+  bool MSVCLTO = false;
+  // Object files that will be passed to MSVC's linker before any archives.
+  std::vector<std::string> MSVCLTOEarlyObjects;
+
   uint64_t ImageBase = -1;
   uint64_t StackReserve = 1024 * 1024;
   uint64_t StackCommit = 4096;
Index: COFF/Driver.cpp
===================================================================
--- COFF/Driver.cpp
+++ COFF/Driver.cpp
@@ -153,6 +153,18 @@
   InputFile *Obj;
   if (Magic == file_magic::coff_object) {
     Obj = make<ObjectFile>(MB);
+    if (Config->MSVCLTO) {
+      // Write the member to a temporary file so we can link it early
+      // to force MSVC symbol resolution to match ours.
+      SmallString<128> S;
+      int Fd;
+      if (auto EC = sys::fs::createTemporaryFile(
+              "lld-" + sys::path::filename(ParentName), ".obj", Fd, S))
+        fatal(EC, "cannot create a temporary file");
+      raw_fd_ostream OS(Fd, /*shouldClose*/ true);
+      OS << MB.getBuffer();
+      Config->MSVCLTOEarlyObjects.push_back(S.str());
+    }
   } else if (Magic == file_magic::bitcode) {
     Obj = make<BitcodeFile>(MB);
   } else {
@@ -512,6 +524,9 @@
   std::string Rsp = "/nologo\n";
   std::vector<std::string> Temps;
 
+  for (auto &Path : Config->MSVCLTOEarlyObjects)
+    Rsp += quote(Path) + "\n";
+
   for (auto *Arg : Args) {
     switch (Arg->getOption().getID()) {
     case OPT_linkrepro:
@@ -601,6 +616,10 @@
     return;
   }
 
+  // Handle /msvclto
+  if (Args.hasArg(OPT_msvclto))
+    Config->MSVCLTO = true;
+
   if (auto *Arg = Args.getLastArg(OPT_linkrepro)) {
     SmallString<64> Path = StringRef(Arg->getValue());
     sys::path::append(Path, "repro.tar");
@@ -987,7 +1006,7 @@
 
   // If /msvclto is given, we use the MSVC linker to link LTO output files.
   // This is useful because MSVC link.exe can generate complete PDBs.
-  if (Args.hasArg(OPT_msvclto)) {
+  if (Config->MSVCLTO) {
     invokeMSVC(Args);
     exit(0);
   }
Index: test/COFF/Inputs/msvclto-order-a.ll
===================================================================
--- /dev/null
+++ test/COFF/Inputs/msvclto-order-a.ll
@@ -0,0 +1,7 @@
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+define void @foo() {
+  ret void
+}
+
Index: test/COFF/Inputs/msvclto-order-b.ll
===================================================================
--- /dev/null
+++ test/COFF/Inputs/msvclto-order-b.ll
@@ -0,0 +1,10 @@
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+declare void @doesntexist()
+
+define void @foo() {
+  call void @doesntexist()
+  ret void
+}
+
Index: test/COFF/msvclto-order.ll
===================================================================
--- /dev/null
+++ test/COFF/msvclto-order.ll
@@ -0,0 +1,23 @@
+; RUN: opt -thinlto-bc %s -o %t.obj
+; RUN: llc -filetype=obj %S/Inputs/msvclto-order-a.ll -o %T/msvclto-order-a.obj
+; RUN: llvm-ar crs %T/msvclto-order-a.lib %T/msvclto-order-a.obj
+; RUN: llc -filetype=obj %S/Inputs/msvclto-order-b.ll -o %T/msvclto-order-b.obj
+; RUN: llvm-ar crs %T/msvclto-order-b.lib %T/msvclto-order-b.obj
+; RUN: lld-link /verbose /msvclto /out:%t.exe /entry:main %t.obj \
+; RUN:     %T/msvclto-order-a.lib %T/msvclto-order-b.lib > %t.log || true
+; RUN: FileCheck %s < %t.log
+
+; CHECK: : link.exe
+; CHECK-NOT: .lib{{$}}
+; CHECK: lld-msvclto-order-a{{.*}}.obj
+; CHECK: .lib{{$}}
+
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+declare void @foo()
+
+define i32 @main() {
+  call void @foo()
+  ret i32 0
+}