Index: lib/Driver/Driver.cpp
===================================================================
--- lib/Driver/Driver.cpp
+++ lib/Driver/Driver.cpp
@@ -303,6 +303,7 @@
   DerivedArgList *DAL = new DerivedArgList(Args);
 
   bool HasNostdlib = Args.hasArg(options::OPT_nostdlib);
+  bool HasNostdlibxx = Args.hasArg(options::OPT_nostdlibxx);
   bool HasNodefaultlib = Args.hasArg(options::OPT_nodefaultlibs);
   for (Arg *A : Args) {
     // Unfortunately, we have to parse some forwarding options (-Xassembler,
@@ -347,7 +348,8 @@
       StringRef Value = A->getValue();
 
       // Rewrite unless -nostdlib is present.
-      if (!HasNostdlib && !HasNodefaultlib && Value == "stdc++") {
+      if (!HasNostdlib && !HasNodefaultlib && !HasNostdlibxx &&
+          Value == "stdc++") {
         DAL->AddFlagArg(A, Opts->getOption(options::OPT_Z_reserved_lib_stdcxx));
         continue;
       }
Index: test/Driver/nostdlibxx.cpp
===================================================================
--- test/Driver/nostdlibxx.cpp
+++ test/Driver/nostdlibxx.cpp
@@ -6,3 +6,12 @@
 // CHECK-NOT: -lstdc++
 // CHECK-NOT: -lc++
 // CHECK: -lm
+
+// Make sure -lstdc++ isn't rewritten to the default stdlib when -nostdlib++ is
+// used.
+//
+// RUN: %clangxx -target i686-pc-linux-gnu -### \
+// RUN:     -nostdlib++ -stdlib=libc++ -lstdc++%s 2> %t
+// RUN: FileCheck --check-prefix=CHECK-RESERVED-LIB-REWRITE < %t %s
+// CHECK-RESERVED-LIB-REWRITE: -lstdc++
+// CHECK-RESERVED-LIB-REWRITE-NOT: -lc++