On Thu, Mar 19, 2020 at 12:45:50PM -0500, Josh Poimboeuf wrote:
> > On Thu, Mar 19, 2020 at 12:33:31PM -0500, Josh Poimboeuf wrote:
> > > Actually I suspect it's the __builtin_unreachable() annotation which is
> > > making UBSAN add the __builtin_trap()... because I don't see any double
> > > UD2s for WARNs.
> Actually, removing __builtin_unreachable() *does* make the extra UD2 go
> away -- I forgot I had some silly debug code.
LOL, check this:
"Built-in Function: void __builtin_unreachable (void)
If control flow reaches the point of the __builtin_unreachable, the
program is undefined. It is useful in situations where the compiler
cannot deduce the unreachability of the code. "
Which, I bet, is what makes UBSAN insert that __builtin_trap().
What a friggin mess :/
