https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95344
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-9 branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:74eb19c2499c1b9011629799e16d74f299f35b33 commit r9-8669-g74eb19c2499c1b9011629799e16d74f299f35b33 Author: Marek Polacek <pola...@redhat.com> Date: Thu Jun 11 18:38:00 2020 -0400 c++: Fix bogus -Wparentheses warning [PR95344] Since r267272, which added location wrappers, cp_fold loses TREE_NO_WARNING on a MODIFY_EXPR that finish_parenthesized_expr set, and that results in a bogus -Wparentheses warning. I.e., previously we had "b = 1" but now we have "VIEW_CONVERT_EXPR<bool>(b) = 1" and cp_fold_maybe_rvalue folds away the location wrapper and so we do 2718 x = fold_build2_loc (loc, code, TREE_TYPE (x), op0, op1); in cp_fold and the flag is lost. PR c++/95344 * cp-gimplify.c (cp_fold) <case MODIFY_EXPR>: Don't set TREE_THIS_VOLATILE here. (cp_fold): Set it here along with TREE_NO_WARNING. * c-c++-common/Wparentheses-2.c: New test.
