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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99459] [11 Regression] Many coroutines regressions on
 armv7hl-linux-gnueabi
Date: Mon, 08 Mar 2021 09:59:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99459

--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #4)
> So perhaps:
> 2021-03-08  Jakub Jelinek  <jakub@redhat.com>
>=20
> 	PR c++/99459
> 	* coroutines.cc (build_co_await): Look through NOP_EXPRs in
> 	build_special_member_call return value to find the CALL_EXPR.
>=20
> --- gcc/cp/coroutines.cc.jj	2021-03-05 21:51:48.671185716 +0100
> +++ gcc/cp/coroutines.cc	2021-03-08 10:53:13.187959339 +0100
> @@ -868,6 +868,8 @@ build_co_await (location_t loc, tree a,
>  		=3D build_special_member_call (a, complete_dtor_identifier,
>  					     NULL, a_type, LOOKUP_NORMAL,
>  					     tf_none);
> +	      if (dummy && CONVERT_EXPR_P (dummy))
> +		dummy =3D TREE_OPERAND (dummy, 0);
>  	      dummy =3D dummy ? TREE_OPERAND (CALL_EXPR_FN (dummy), 0)
>  			    : NULL_TREE;
>  	      if (dummy && coro_diagnose_throwing_fn (dummy))
> @@ -1031,6 +1033,8 @@ build_co_await (location_t loc, tree a,
>  	    =3D build_special_member_call (e_proxy, complete_dtor_identifier,
>  					 NULL, o_type, LOOKUP_NORMAL,
>  					 tf_none);
> +	  if (dummy && CONVERT_EXPR_P (dummy))
> +	    dummy =3D TREE_OPERAND (dummy, 0);
>  	  dummy =3D dummy ? TREE_OPERAND (CALL_EXPR_FN (dummy), 0)
>  			: NULL_TREE;
>  	  if (dummy && coro_diagnose_throwing_fn (dummy))
>=20
> ?

looks reasonable to me - but I have no way to test it at present.=