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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/108702] [13 Regression] ICE in get_partitioning_class, at
 symtab.cc:2096 since r13-4161-g32d16fe9d7e347bc
Date: Wed, 08 Feb 2023 16:08:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108702

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Without -flto, the testcase can't be linked:
./cc1plus -quiet -std=3Dc++23 stmtexpr19.C; g++ -o stmtexpr19{,.s}
/usr/bin/ld: /tmp/ccUo7FRx.o:(.rodata+0x0): undefined reference to
`setup()::inner'
collect2: error: ld returned 1 exit status

On the other side, when static constexpr vars are defined inside of constex=
pr
functions or even consteval functions, it works ok:

extern "C" void abort ();

constexpr const int *
foo ()
{
  static constexpr int a =3D 1;
  return &a;
}

consteval const int *
bar ()
{
  static constexpr int a =3D 1;
  return &a;
}

[[gnu::noipa]] void
baz (const int *x)
{
  if (*x !=3D 1)
    abort ();
}

int
main ()
{
  constexpr const int *p =3D foo ();
  constexpr const int *q =3D bar ();
  baz (p);
  baz (q);
  if (p =3D=3D q)
    abort ();
}=