https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97659
--- Comment #4 from Paweł Bylica <chfast at gmail dot com> --- I'd like to explain some things here (to my best knowledge): 1. The "pointer-subtract" checks is ASan extension, not enabled by default. When running with this check enabled in my application I have not detected any issues in std::vector. 2. The "pointer-subtract" checks if you pointer subtraction operands are from the same memory allocation. Allowed values are all pointers from the memory region plus the "end" pointer one element outside of the region. Other subtractions are UB in C to my information. 3. The issue shows up only when "pointer-subtract" is combined with _GLIBCXX_SANITIZE_VECTOR. Moreover, the report looks like false positive because the subtraction is between the "end" pointer and a pointer from inside of a memory region.
