[tz] [PROPOSED 1/7] Avoid undefined behavior if no Link lines

[Paul Eggert]

On 10/27/22 15:53, Brian Inglis via tz wrote:
> 
> Itanium NULL pointer representation is -1:
> 
> https://refspecs.linuxfoundation.org/cxxabi-1.75.html

That's talking about null data member pointers, not null pointers. Data 
member pointers are a C++ concept and are different animals from 
pointers. Some C++ implementations represent null data member pointers 
with 0, some with -1 (both ideas work reasonably well). Either way, 
adding 0 to one gives you the same data member pointer you started off 
with, namely, a null data member pointer (not that this matters for C).