https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95700
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> --- To be really safe during stage 1, GCC should not use NULL as a pointer sentinel in C++ code anyway. The bootstrap compiler could define it to 0 or 0u, neither of which is guaranteed to be OK to pass as a varargs sentinel where a null pointer is expected. Any of (void*)0 or (void*)NULL or nullptr would be safe.
