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From: "movaki1751 at vootin dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/108936] New: internal compiler error: in
 type_has_nontrivial_copy_init, at cp/tree.cc:4525
Date: Sun, 26 Feb 2023 23:18:43 +0000
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X-Bugzilla-Version: 12.2.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108936

            Bug ID: 108936
           Summary: internal compiler error: in
                    type_has_nontrivial_copy_init, at cp/tree.cc:4525
           Product: gcc
           Version: 12.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: movaki1751 at vootin dot com
  Target Milestone: ---

Created attachment 54538
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54538&action=3Dedit
The attachment was generated with the "-freport-bug" option. It contains all
the required technical information and the preprocessed file

Trying to use "(union{short s;char c;}){1}.c !=3D 1;" in a constexpr to det=
ermine
host byte order


Expected behavior:
error: accessing =E2=80=98<unnamed union>::c=E2=80=99 member instead of ini=
tialized =E2=80=98<unnamed
union>::s=E2=80=99 member in constant expression
    6 |     static constexpr bool BigEndianHost =3D (union{short s;char c;}=
){1}.c
!=3D 1;


Actual behavior:
internal compiler error: in type_has_nontrivial_copy_init, at cp/tree.cc:45=
25
     6 |     static constexpr bool BigEndianHost =3D (union{short s;char
c;}){1}.c !=3D 1;


If i remove "template<bool BigEndianData =3D true>" from the example code (=
see
attachment), i get the expected behavior


The exact version of GCC, and other required information is in the attachme=
nt=