Add an out-of-line virtual method to provide a home for the cl::option class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29191 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/CommandLine.h

@@ -150,6 +150,9 @@ class Option {
     return NormalFormatting;
   }
 
+  // Out of line virtual function to provide home for the class.
+  virtual void anchor();
+  
   int NumOccurrences;   // The number of times specified
   int Flags;            // Flags for the argument
   unsigned Position;    // Position of last occurrence of the option

lib/Support/CommandLine.cpp

@@ -607,6 +607,10 @@ void cl::ParseCommandLineOptions(int &argc, char **argv,
 // Option Base class implementation
 //
 
+// Out of line virtual function to provide home for the class.
+void Option::anchor() {
+}
+
 bool Option::error(std::string Message, const char *ArgName) {
   if (ArgName == 0) ArgName = ArgStr;
   if (ArgName[0] == 0)