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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Date: Mon, 29 Jun 2020 17:14:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95970

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
I think the warning is a false positive.  The problem call is introduced by
early inlining and is eliminated by path isolation, but the -Wnonnull warni=
ng
code runs before that happens (by the post_ipa_warn pass).

Here's the relevant portion of the path isolation dump showing the removal:

;; Function Named_type::do_type_descriptor
(_ZN10Named_type18do_type_descriptorE
P4GogoPS_, funcdef_no=3D8125, decl_uid=3D214219, cgraph_uid=3D3913,
symbol_order=3D4835)


Pass statistics of "isolate-paths": ----------------
...
Removing basic block 11
;; basic block 11, loop depth 0
;;  pred:=20=20=20=20=20=20
_20 =3D MEM[(int (*) () *)_19 + 96B];
_21 =3D OBJ_TYPE_REF(_20;(struct Type)0B->12) (0B, gogo_9(D), 0B);
this_7(D)->seen_alias_ =3D 0;
goto <bb 10>; [100.00%]
;;  succ:       10=