nacl-clang driver: Derive nacltools::Link from gnutools::Link

lib/Driver/Tools.h

 //===--- Tools.h - Tool Implementations -------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CLANG_LIB_DRIVER_TOOLS_H
@@ skipping 506 matching lines @@
   class LLVM_LIBRARY_VISIBILITY AssembleARM : public gnutools::Assemble  {
   public:
     AssembleARM(const ToolChain &TC) : gnutools::Assemble(TC) {}
 
     void ConstructJob(Compilation &C, const JobAction &JA,
                       const InputInfo &Output,
                       const InputInfoList &Inputs,
                       const llvm::opt::ArgList &TCArgs,
                       const char *LinkingOutput) const override;
   };
-  class LLVM_LIBRARY_VISIBILITY Link : public Tool  {
+  class LLVM_LIBRARY_VISIBILITY Link : public gnutools::Link  {
   public:
-    Link(const ToolChain &TC) : Tool("NaCl::Link", "linker", TC) {}
-
-    bool hasIntegratedCPP() const override { return false; }
-    bool isLinkJob() const override { return true; }
+    Link(const ToolChain &TC) : gnutools::Link(TC) {}
 
     void ConstructJob(Compilation &C, const JobAction &JA,
-                              const InputInfo &Output,
-                              const InputInfoList &Inputs,
-                              const llvm::opt::ArgList &TCArgs,
-                              const char *LinkingOutput) const override;
+                      const InputInfo &Output,
+                      const InputInfoList &Inputs,
+                      const llvm::opt::ArgList &TCArgs,
+                      const char *LinkingOutput) const override;
   };
 }
 
   /// minix -- Directly call GNU Binutils assembler and linker
 namespace minix {
   class LLVM_LIBRARY_VISIBILITY Assemble : public GnuTool  {
   public:
     Assemble(const ToolChain &TC) : GnuTool("minix::Assemble", "assembler",
                                          TC) {}
 
@@ skipping 173 matching lines @@
                     const llvm::opt::ArgList &TCArgs,
                     const char *LinkingOutput) const override;
 };
 }
 
 } // end namespace toolchains
 } // end namespace driver
 } // end namespace clang
 
 #endif