From ea4dd8f512979db247c54d6b41377bb73699bcd7 Mon Sep 17 00:00:00 2001 From: Jason Merrill Date: Wed, 15 Mar 2023 16:33:37 -0400 Subject: [PATCH] c++: co_await and initializer_list [PR103871] When flatten_await_stmt processes the backing array for an initializer_list, we call cp_build_modify_expr to initialize the promoted variable from the TARGET_EXPR; that needs to be accepted. PR c++/103871 PR c++/98056 gcc/cp/ChangeLog: * typeck.cc (cp_build_modify_expr): Allow array initialization of DECL_ARTIFICIAL variable. gcc/testsuite/ChangeLog: * g++.dg/coroutines/co-await-initlist1.C: New test. --- gcc/cp/typeck.cc | 2 ++ .../g++.dg/coroutines/co-await-initlist1.C | 21 +++++++++++++++++++++ 2 files changed, 23 insertions(+) create mode 100644 gcc/testsuite/g++.dg/coroutines/co-await-initlist1.C diff --git a/gcc/cp/typeck.cc b/gcc/cp/typeck.cc index d5a3e50..afb9560 100644 --- a/gcc/cp/typeck.cc +++ b/gcc/cp/typeck.cc @@ -9630,6 +9630,8 @@ cp_build_modify_expr (location_t loc, tree lhs, enum tree_code modifycode, } /* Allow array assignment in compiler-generated code. */ + else if (DECL_P (lhs) && DECL_ARTIFICIAL (lhs)) + /* OK, used by coroutines (co-await-initlist1.C). */; else if (!current_function_decl || !DECL_DEFAULTED_FN (current_function_decl)) { diff --git a/gcc/testsuite/g++.dg/coroutines/co-await-initlist1.C b/gcc/testsuite/g++.dg/coroutines/co-await-initlist1.C new file mode 100644 index 0000000..b8e8923 --- /dev/null +++ b/gcc/testsuite/g++.dg/coroutines/co-await-initlist1.C @@ -0,0 +1,21 @@ +// PR c++/103871 +// { dg-do compile { target c++20 } } + +#include +#include + +struct my_coro { + struct promise_type { + my_coro get_return_object(); + std::suspend_never initial_suspend(); + std::suspend_never final_suspend() noexcept; + void unhandled_exception(); + }; +}; + +std::suspend_never inner(std::initializer_list); + +my_coro doesnt_work() +{ + co_await inner({ 1,2,3 }); +} -- 2.7.4