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

include/llvm/Support/CommandLine.h

@@ -21,6 +21,7 @@
 #define LLVM_SUPPORT_COMMANDLINE_H
 
 #include "llvm/Support/type_traits.h"
+#include "llvm/Support/DataTypes.h"
 #include <string>
 #include <vector>
 #include <utility>
@@ -335,7 +336,7 @@ public:
 
 template<class DataType>
 ValuesClass<DataType> values(const char *Arg, DataType Val, const char *Desc,
-                             ...) {
+                             ...) END_WITH_NULL {
     va_list ValueArgs;
     va_start(ValueArgs, Desc);
     ValuesClass<DataType> Vals(Arg, Val, Desc, ValueArgs);