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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94704] [8/9/10 Regression] class with empty base passed
 incorrectly with -std=c++17 on s390x/s390
Date: Wed, 22 Apr 2020 12:41:21 +0000
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X-Bugzilla-Keywords: ABI, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94704

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Completely untested guess:
--- gcc/config/s390/s390.c.jj   2020-03-14 08:14:47.097741411 +0100
+++ gcc/config/s390/s390.c      2020-04-22 14:24:17.980091105 +0200
@@ -11917,7 +11917,8 @@ s390_function_arg_vector (machine_mode m

       for (field =3D TYPE_FIELDS (type); field; field =3D DECL_CHAIN (fiel=
d))
        {
-         if (TREE_CODE (field) !=3D FIELD_DECL)
+         if (TREE_CODE (field) !=3D FIELD_DECL
+             || cxx17_empty_base_field_p (field))
            continue;

          if (single =3D=3D NULL_TREE)
@@ -11967,7 +11968,8 @@ s390_function_arg_float (machine_mode mo

       for (field =3D TYPE_FIELDS (type); field; field =3D DECL_CHAIN (fiel=
d))
        {
-         if (TREE_CODE (field) !=3D FIELD_DECL)
+         if (TREE_CODE (field) !=3D FIELD_DECL
+             || cxx17_empty_base_field_p (field))
            continue;

          if (single =3D=3D NULL_TREE)
(on top of the today posted cxx17_empty_base_field_p patch).
Though, of course that doesn't handle the -Wpsabi part if s390{,x} wants to
emit such diagnostics; for that the functions or their caller should determ=
ine
if they would make a different ABI decisions if the field wouldn't be skipp=
ed.=