On Thu, 31 Mar 2022, Matthias Kretz via Gcc-patches wrote:
I like it. But I'd like it even more if we could have
#elif defined _UBSAN
__ubsan_invoke_ub("reached std::unreachable()");
But to my knowledge UBSAN has no hooks for the library like this (yet).
-fsanitize=undefined already replaces __builtin_unreachable with its own
thing, so I was indeed going to ask if the assertion / trap provide a
better debugging experience compared to plain __builtin_unreachable, with
the possibility to get a stack trace (UBSAN_OPTIONS=print_stacktrace=1),
etc? Detecting if (the right subset of) ubsan is enabled sounds like a
good idea.
--
Marc Glisse
