Fix for PR4140: Add the start of a Linux toolchain (basically, just 
barely enough to get the given usage of -print-file-name working).



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72412 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.h b/lib/Driver/ToolChains.h
index 5a5c13b..3ecd171 100644
--- a/lib/Driver/ToolChains.h
+++ b/lib/Driver/ToolChains.h
@@ -121,6 +121,12 @@
   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA) const;
 };
 
+class VISIBILITY_HIDDEN Linux : public Generic_GCC {
+public:
+  Linux(const HostInfo &Host, const llvm::Triple& Triple);
+};
+
+
 } // end namespace toolchains
 } // end namespace driver
 } // end namespace clang