https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62006
--- Comment #4 from Thomas Köppe <tkoeppe at google dot com> --- Ah, you're right, this offset pointer computation as it stands is undefined behaviour. The intended use is to use those pointers only within a preallocated arena, so that the pointers would indeed live in a common object (a large array). I shall change the allocator to an arena allocator and rerun the test. The intended use for offset pointers is to inter-process communication; a vector with the fancy-pointer allocator can be used from two separate processes.
