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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/114574] [14 regression] ICE when building curl with LTO
 (fld_incomplete_type_of, at ipa-free-lang-data.cc:257) since r14-9763
Date: Thu, 18 Apr 2024 11:57:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114574

--- Comment #29 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to uecker from comment #28)
> I do not fully understand yet what happens for may_alias, but it if we la=
ter
> complete the struct with the may_alias attribute it seems we would also n=
eed
> to update the previously created pointer so that it has
> TYPE_REF_CAN_ALIAS_ALL.  Setting TYPE_STRUCTURAL_EQUALITY for incomplete
> structs also for pre-C23 seems to fix the assertion failure, but I am not
> sure if this fixes the underlying bug.

Certainly that may_alias case isn't specific to just C, C++ behaves the sam=
e,
and I'd just say don't do that, you can always put the may_alias attribute =
on
the forward declaration of the struct if all pointers to it are supposed to
alias.=