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Date: Mon, 16 Nov 2020 21:18:32 +0100
From: Jan Hubicka <hubicka@ucw.cz>
To: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
Cc: gcc-bugs@gcc.gnu.org, msebor@redhat.com
Subject: Re: [Bug middle-end/97840] [11 regression] Bogus -Wmaybe-uninitialized
Message-ID: <20201116201832.GE32961@kam.mff.cuni.cz>
References: <bug-97840-4@http.gcc.gnu.org/bugzilla/>
 <bug-97840-4-KKYRTghbtl@http.gcc.gnu.org/bugzilla/>
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> Note i686-linux bootstrap is still broken in r11-5062 - the PR97853 error.
Yes, as discussed earlier (but perhaps lost in other coments) we need
fix for the targetm.calls.empty_record_p (type) divergence. It is not
clear to me if simply calling the default implementation instead of the
rather complicated conditional

  if (TYPE_EMPTY_P (rhstype)
      || (RECORD_OR_UNION_TYPE_P (rhstype)
          && (!first_field (rhstype)
              || default_is_empty_record (rhstype))))
    return NULL_TREE;

is desired here, so hope Martin Sebor will know.  Perhaps simply
exporting default_is_empty_type and doing 

  if (default_is_empty_type (rhstype))
    return NULL_TREE;