[Bug c++/69723] pre-post-increment/decrement and reading the same variable that is assigned should not be considered uses for Wunused-but-set-variable

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69723

--- Comment #9 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #7)
> As for the missed -Wuninitialized at -O0, wonder if we couldn't do something
> about it for GCC 7.

Note that people do complain a lot about this case: PR43361 and duplicates.

When I analyzed all open Wuninitialized bugs, this was problem #2
(https://gcc.gnu.org/wiki/Better_Uninitialized_Warnings#Problem_2:_Representation_issues_.28either_IR_or_SSA_issues.29)