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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/108422] [13 Regression] ICE: base pointer cycle detected
 since r13-2661-gb57abd072dd319a7
Date: Mon, 20 Feb 2023 10:02:55 +0000
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X-Bugzilla-Keywords: ice-on-invalid-code, ice-on-valid-code, openmp
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108422

--- Comment #4 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Created attachment 54491
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54491&action=3Dedit
Testcase - compile with 'g++ -fopenmp' + run

(In reply to Tobias Burnus from comment #3)
> --- a/gcc/gimplify.cc
> +++ b/gcc/gimplify.cc
> @@ -9643 +9643 @@ omp_tsort_mapping_groups_1 (omp_mapping_group ***outlis=
t,
> -      if (innerp && *innerp !=3D grp)
> +      if (innerp && *innerp !=3D grp && (*innerp)->mark !=3D PERMANENT)

While COMPILING WORKS and the expected nested-target warning is printed,
it FAILS at RUNTIME (on a system not configured for offloading) with a
segfault.

That's related to the warning:
  test.cc:20:13: warning: '__closure' is used uninitialized [-Wuninitialize=
d]
which appears at the location of the outer 'omp target (parallel)'.


Note: without inner target construct (reverse offload), the program runs fi=
ne.
(Independent of the one-line patch.)=