https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93046
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:bbdb5612f6661f2c64b0c0f1d2291cb59fde2b40 commit r13-2964-gbbdb5612f6661f2c64b0c0f1d2291cb59fde2b40 Author: Jason Merrill <ja...@redhat.com> Date: Fri Sep 23 09:07:22 2022 -0400 c++: fix class-valued ?: extension When the gimplifier encounters the same TARGET_EXPR twice, it evaluates TARGET_EXPR_INITIAL the first time and clears it so that the later evaluation is just the temporary. With this testcase, using the extension to treat an omitted middle operand as repeating the first operand, that led to doing a bitwise copy of the S(1) temporary on return rather than properly calling the copy constructor. We can't use S(1) to initialize the return value here anyway, because we need to materialize it into a temporary so we can convert it to bool and determine which arm we're evaluating. So let's just treat the middle operand as an xvalue. PR c++/93046 gcc/cp/ChangeLog: * call.cc (build_conditional_expr): For a?:c extension, treat a reused class prvalue as an xvalue. gcc/testsuite/ChangeLog: * g++.dg/ext/cond4.C: Add runtime test.
