[Driver] Also obey -nostdlib++ when rewriting -lstdc++.

[pirama]

test/Driver/nostdlibxx.cpp

14

Missing space here?

[pirama]

test/Driver/nostdlibxx.cpp

14

Between -lstdc++ and the %s.

lib/Driver/Driver.cpp

if (Claim)
     A->claim();
   return A;
 }
 
 DerivedArgList *Driver::TranslateInputArgs(const InputArgList &Args) const {
   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,
     // -Xlinker, -Xpreprocessor) because we either integrate their functionality
     // (assembler and preprocessor), or bypass a previous driver ('collect2').
 
     // Rewrite linker options, to replace --no-demangle with a custom internal
     // option.
if (A->getOption().matches(options::OPT_Wp_COMMA) &&
       continue;
     }
 
     // Rewrite reserved library names.
     if (A->getOption().matches(options::OPT_l)) {
       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;
       }
 
       // Rewrite unconditionally.
       if (Value == "cc_kext") {
         DAL->AddFlagArg(A, Opts->getOption(options::OPT_Z_reserved_lib_cckext));
         continue;

test/Driver/nostdlibxx.cpp

 // RUN: %clangxx -target i686-pc-linux-gnu -### -nostdlib++ %s 2> %t
 // RUN: FileCheck < %t %s
 
 // We should still have -lm and the C standard libraries, but not -lstdc++.
 
 // 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++