diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -895,7 +895,6 @@
   raw_string_ostream os(err);
 
   const char *argv[] = {config->progName.data(), opt.data()};
-  cl::ResetAllOptionOccurrences();
   if (cl::ParseCommandLineOptions(2, argv, "", &os))
     return;
   os.flush();
@@ -1106,6 +1105,7 @@
   }
 
   // Parse LTO options.
+  cl::ResetAllOptionOccurrences();
   if (auto *arg = args.getLastArg(OPT_plugin_opt_mcpu_eq))
     parseClangOption(saver.save("-mcpu=" + StringRef(arg->getValue())),
                      arg->getSpelling());
diff --git a/lld/test/ELF/lto/mllvm.ll b/lld/test/ELF/lto/mllvm.ll
new file mode 100644
--- /dev/null
+++ b/lld/test/ELF/lto/mllvm.ll
@@ -0,0 +1,17 @@
+; REQUIRES: x86
+; RUN: llvm-as %s -o %t.o
+; RUN: ld.lld %t.o -o %t -mllvm -debug-pass=Structure -mllvm -print-after-all 2>&1 | FileCheck %s
+
+;; With a few exceptions, most -plugin-opt=- prefixed options are passed through
+;; to cl::ParseCommandLineOptions.
+; RUN: ld.lld %t.o -o %t -plugin-opt=-debug-pass=Structure -plugin-opt=-print-after-all 2>&1 | FileCheck %s
+
+; CHECK: Pass Arguments:
+; CHECK: # *** IR Dump
+
+target triple = "x86_64-unknown-linux-gnu"
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @_start() {
+  ret void
+}