> Unless I hear otherwise, I'll go ahead and change the patch
> to have only the type-generic built-ins accept a null pointer
> as an argument.

Since Jason doesn't think making it work in C++ 98 is important
I modified the patch to keep the Clang-compatibility built-ins
unchanged and to remove the default argument from the others.
Attached is an updated version intended to be applied on top
of the c/70883 patch.

Martin