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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/94947] [8/9/10/11 Regression] -fipa-pta + pthread_once
 crash since r6-5684-g47e5754e17e9ac3b
Date: Tue, 05 May 2020 06:59:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94947

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
   Target Milestone|---                         |8.5
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot =
gnu.org

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  It's a little tricky but I think it boils down to

extern void abort ();
extern void baz ();
extern void (*baz_call)();
static int *p;

static void foo ()
{
  if (*p !=3D 1)
    abort ();
}

int main()
{
  int x =3D 1;
  p =3D &x;
  baz_call =3D foo;
  baz ();
  return 0;
}

---

void (*baz_call)();
void baz ()
{
  baz_call ();
}

and the issue being that escaping foo at baz_call =3D foo does not escape
foos call uses/clobbers.=