[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

[uecker at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114574

--- Comment #28 from uecker at gcc dot gnu.org ---

I do not fully understand yet what happens for may_alias, but it if we later
complete the struct with the may_alias attribute it seems we would also need 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.