Thread safety: adding additional documentation to the main thread safety interface, and making the destructor for the thread safety handler pure virtual

llvm-svn: 139722

clang/lib/Analysis/ThreadSafety.cpp

@@ -10,7 +10,8 @@
 // A intra-procedural analysis for thread safety (e.g. deadlocks and race
 // conditions), based off of an annotation system.
 //
-// See http://gcc.gnu.org/wiki/ThreadSafetyAnnotation for the gcc version.
+// See http://clang.llvm.org/docs/LanguageExtensions.html#threadsafety for more
+// information.
 //
 //===----------------------------------------------------------------------===//
 
@@ -36,6 +37,9 @@
 using namespace clang;
 using namespace thread_safety;
 
+// Key method definition
+ThreadSafetyHandler::~ThreadSafetyHandler() {}
+
 // Helper functions
 static Expr *getParent(Expr *Exp) {
   if (MemberExpr *ME = dyn_cast<MemberExpr>(Exp))