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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/99122] [10/11 Regression] ICE in force_constant_size, at
 gimplify.c:733
Date: Thu, 18 Feb 2021 12:00:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99122

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
E.g.
static int foo ();

int
bar (int n)
{
  return foo (n, 2.0);
}

static inline int
foo (int n, struct T { char a[n]; } b)
{
  int r =3D 0, i;
  for (i =3D 0; i < n; i++)
    r +=3D b.a[i];
  return r;
}

ICEs at -O2 too.  And there is no WITH_SIZE_EXPR argument in that case.
So I think next to looking for WITH_SIZE_EXPR arguments it should also look
through callee DECL_ARGUMENTS if any argument has non-constant TYPE_SIZE* (=
or
DECL_SIZE*?).=