https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113064
--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>: https://gcc.gnu.org/g:1c522c9eafa5b86b78cd7b3044e120762fb4c879 commit r14-6899-g1c522c9eafa5b86b78cd7b3044e120762fb4c879 Author: Patrick Palka <ppa...@redhat.com> Date: Wed Jan 3 15:43:28 2024 -0500 c++: bad direct reference binding via conv fn [PR113064] When computing a direct reference binding via a conversion function yields a bad conversion, reference_binding incorrectly commits to that conversion instead of trying a conversion via a temporary. This causes us to reject the first testcase because the bad direct conversion to B&& via the && conversion operator prevents us from considering the good conversion via the & conversion operator and a temporary. (Similar story for the second testcase.) This patch fixes this by making reference_binding not prematurely commit to such a bad direct conversion. We still fall back to it if using a temporary also fails (otherwise the diagnostic for cpp0x/explicit7.C regresses). PR c++/113064 gcc/cp/ChangeLog: * call.cc (reference_binding): Still try a conversion via a temporary if a direct conversion was bad. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/rv-conv4.C: New test. * g++.dg/cpp0x/rv-conv5.C: New test.
