[Bug c++/98947] [10/11 Regression] Incorrect warning when using a ternary operator to select one of two volatile variables to write to

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98947

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Incorrect warning when      |[10/11 Regression]
                   |using a ternary operator to |Incorrect warning when
                   |select one of two volatile  |using a ternary operator to
                   |variables to write to       |select one of two volatile
                   |                            |variables to write to
           Priority|P3                          |P2
   Target Milestone|---                         |10.3

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think warning on

  (b ? x : y) = 27;

is bogus, therefore I'd argue that this is a regression; gcc 9 didn't issue any
warnings with -std=c++2a.

I have a patch.  Of course, we should still warn for

(b ? x : y) += 27;
(b ? (x = 24) : y) = 25;

etc.