When a function takes a variable number of pointer arguments, with a zero
pointer marking the end of the list, the zero *must* be cast to the pointer
type. An un-cast zero is a 32-bit int, and at least on x86_64, gcc will
not extend the zero to 64 bits, thus allowing the upper 32 bits to be
random junk.
The new END_WITH_NULL macro may be used to annotate a such a function
so that GCC (version 4 or newer) will detect the use of un-casted zero
at compile time.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23888 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/examples/Fibonacci/fibonacci.cpp b/examples/Fibonacci/fibonacci.cpp
index af17d09..e9d0136 100644
--- a/examples/Fibonacci/fibonacci.cpp
+++ b/examples/Fibonacci/fibonacci.cpp
@@ -37,7 +37,8 @@
static Function *CreateFibFunction(Module *M) {
// Create the fib function and insert it into module M. This function is said
// to return an int and take an int parameter.
- Function *FibF = M->getOrInsertFunction("fib", Type::IntTy, Type::IntTy, 0);
+ Function *FibF = M->getOrInsertFunction("fib", Type::IntTy, Type::IntTy,
+ (Type *)0);
// Add a basic block to the function.
BasicBlock *BB = new BasicBlock("EntryBlock", FibF);