[weak vtables] Remove a bunch of weak vtables

This patch removes most of the trivial cases of weak vtables by pinning them to
a single object file. The memory leaks in this version have been fixed. Thanks
Alexey for pointing them out.

Differential Revision: http://llvm-reviews.chandlerc.com/D2068

Reviewed by Andy

llvm-svn: 195064

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/examples/Kaleidoscope/Chapter6/toy.cpp b/llvm/examples/Kaleidoscope/Chapter6/toy.cpp
index 4d6a128cba2..70f233bf487 100644
--- a/llvm/examples/Kaleidoscope/Chapter6/toy.cpp
+++ b/llvm/examples/Kaleidoscope/Chapter6/toy.cpp
@@ -105,10 +105,13 @@ static int gettok() {
 /// ExprAST - Base class for all expression nodes.
 class ExprAST {
 public:
-  virtual ~ExprAST() {}
+  virtual ~ExprAST();
   virtual Value *Codegen() = 0;
 };
 
+// Provide out-of-line definition to prevent weak vtable.
+ExprAST::~ExprAST() {}
+
 /// NumberExprAST - Expression class for numeric literals like "1.0".
 class NumberExprAST : public ExprAST {
   double Val;