https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95736
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Iain D Sandoe <ia...@gcc.gnu.org>: https://gcc.gnu.org/g:c5a90f61ace5aca821224a658c223881d5b02388 commit r10-8394-gc5a90f61ace5aca821224a658c223881d5b02388 Author: Iain Sandoe <i...@sandoe.co.uk> Date: Tue Jun 30 08:18:34 2020 +0100 coroutines: Handle awaiters that are sub-objects [PR95736] Move deciding on initializers for awaitables to the build of the co_await, this allows us to analyse cases that do not need a temporary at that point. As the PR shows, the late analysis meant that we were not checking properly for the case that an awaiter is a sub-object of an existing variable outside the current function scope (and therefore does not need to be duplicated in the frame). gcc/cp/ChangeLog: PR c++/95736 * coroutines.cc (get_awaitable_var): New helper. (build_co_await): Check more carefully before copying an awaitable. (expand_one_await_expression): No initializer is required when the awaitable is not a temp. (register_awaits): Remove handling that is now completed when the await expression is built. gcc/testsuite/ChangeLog: PR c++/95736 * g++.dg/coroutines/pr95736.C: New test. (cherry picked from commit daaed0199ee57013ae011421a7e90b7bdd295373)
