Index: lld/COFF/Driver.cpp
===================================================================
--- lld/COFF/Driver.cpp
+++ lld/COFF/Driver.cpp
@@ -128,6 +128,15 @@
                              bool WholeArchive) {
   StringRef Filename = MB->getBufferIdentifier();
 
+  // A file shouldn't be parsed more than once even if it is
+  // represented in different paths.
+  for (StringRef Path : FilePaths) {
+    if (sys::fs::equivalent(Path, Filename)) {
+      warn(Filename + ": object specified more than once");
+      return;
+    }
+  }
+
   MemoryBufferRef MBRef = takeBuffer(std::move(MB));
   FilePaths.push_back(Filename);
 
@@ -1229,22 +1238,25 @@
   if (errorCount())
     return;
 
-  bool WholeArchiveFlag = Args.hasArg(OPT_wholearchive_flag);
+  // A predicate returning true if a given path is an argument for
+  // /wholearchive:, or /wholearchive is enabled globally.
+  // This function is a bit tricky because "foo.obj /wholearchive:././foo.obj"
+  // needs to be handled as "/wholearchive:foo.obj foo.obj".
+  auto IsWholeArchive = [&](StringRef Path) {
+    if (Args.hasArg(OPT_wholearchive_flag))
+      return true;
+    for (auto *Arg : Args.filtered(OPT_wholearchive_file))
+      if (sys::fs::equivalent(Path, Arg->getValue()))
+        return true;
+    return false;
+  };
+
   // Create a list of input files. Files can be given as arguments
   // for /defaultlib option.
-  std::vector<MemoryBufferRef> MBs;
-  for (auto *Arg : Args.filtered(OPT_INPUT, OPT_wholearchive_file)) {
-    switch (Arg->getOption().getID()) {
-    case OPT_INPUT:
-      if (Optional<StringRef> Path = findFile(Arg->getValue()))
-        enqueuePath(*Path, WholeArchiveFlag);
-      break;
-    case OPT_wholearchive_file:
-      if (Optional<StringRef> Path = findFile(Arg->getValue()))
-        enqueuePath(*Path, true);
-      break;
-    }
-  }
+  for (auto *Arg : Args.filtered(OPT_INPUT, OPT_wholearchive_file))
+    if (Optional<StringRef> Path = findFile(Arg->getValue()))
+      enqueuePath(*Path, IsWholeArchive(Arg->getValue()));
+
   for (auto *Arg : Args.filtered(OPT_defaultlib))
     if (Optional<StringRef> Path = findLib(Arg->getValue()))
       enqueuePath(*Path, false);
Index: lld/test/COFF/wholearchive.s
===================================================================
--- lld/test/COFF/wholearchive.s
+++ lld/test/COFF/wholearchive.s
@@ -10,6 +10,14 @@
 # RUN: lld-link -dll -out:%t.dll -entry:main %t.main.obj -wholearchive %t.archive.lib -implib:%t.lib
 # RUN: llvm-readobj %t.lib | FileCheck %s -check-prefix CHECK-IMPLIB
 
+# RUN: lld-link -dll -out:%t.dll -entry:main %t.main.obj %t.archive.lib -wholearchive:%t.archive.lib -implib:%t.lib
+# RUN: llvm-readobj %t.lib | FileCheck %s -check-prefix CHECK-IMPLIB
+
+# RUN: mkdir -p %t.dir
+# RUN: cp %t.archive.lib %t.dir/foo.lib
+# RUN: lld-link -dll -out:%t.dll -entry:main %t.main.obj %t.dir/./foo.lib -wholearchive:%t.dir/foo.lib -implib:%t.lib
+# RUN: llvm-readobj %t.lib | FileCheck %s -check-prefix CHECK-IMPLIB
+
 # CHECK-IMPLIB: Symbol: __imp_exportfn3
 # CHECK-IMPLIB: Symbol: exportfn3