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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/99322] [11 Regression] ICE in change_scope, at final.c:1480
Date: Fri, 05 Mar 2021 14:52:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99322

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Simpler testcase:
void
foo (void)
{
  void *p =3D &&lab;
  #pragma omp parallel
  for (;;)
    ;
  lab:;
}

The problem seems that the OpenMP parallel body is noreturn, so when buildi=
ng
cfg we build correctly:
<bb 2> :
p =3D &lab;
#pragma omp parallel [child fn: foo._omp_fn.0 (???)]

<bb 3> :
goto <bb 3>; [INV]

<bb 4> :
#pragma omp return

<bb 5> :
lab:
return;

but during cfg cleanup, we find that #pragma omp return is unreachable (tha=
t is
ok) and that also lab: return; is unreachable.  And place it somewhere
randomly, which would be ok if it wouldn't be inside of the OpenMP block bo=
dy
(bb3).=