https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114763
--- Comment #3 from hanwei (K) <hanwei62 at huawei dot com> --- (In reply to Andrew Pinski from comment #1) > Note only the second case has if's 2 sides which are the same; > it is basically `a ? b : (c ? d : d)`. > > While the first case you have `a ? b : (c ? d : b)` which is not supposed to > warn about at all because the 2 sides are not the same. > > The reason is because that is how the grammar of C/C++ works. So, Wduplicated-branches just check bottom two branches actually. Because only the bottom two branches will same if we check followed the grammar of C/C++.
