[Bug c++/89796] Incorrect warning generated with OpenMP atomic capture

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89796

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2019-03-25
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 46018
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46018&action=edit
gcc9-pr89796.patch

Untested fix.

You could have used simpler
#pragma omp atomic capture
prev = c++;
that wouldn't warn (so, if you want a workaround, use that).