From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 56FEE3857005; Thu, 27 Aug 2020 08:11:30 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 56FEE3857005
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1598515890;
 bh=5rniUfyno6Z1mAM8f06WzDQPdakK6diMJGOihv9OSQ8=;
 h=From:To:Subject:Date:From;
 b=QYS1ra42c9SfN68ojvP0QvoaDmcMqQ/IoaZE7VUN/crp7HD0b5Hm7Ohf+WJsIrL5v
 DqKV4DGjfG1SXH6o1Fey5ehzE2yBH9peFEp0tKmoG++xIE/PGzyv6gMI1FQDdtBJlQ
 60d5Mke5f21gcZiK9olraj+LsbZ3bu4ztxfjdYN8=
From: "weiwt.fnst at cn dot fujitsu.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/96810] New: This is a case that gcc shoud not compile
 successfully, but gcc acts opposite.
Date: Thu, 27 Aug 2020 08:11:30 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: weiwt.fnst at cn dot fujitsu.com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-96810-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Thu, 27 Aug 2020 08:11:30 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96810

            Bug ID: 96810
           Summary: This is a case that gcc shoud not compile
                    successfully, but gcc acts opposite.
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: weiwt.fnst at cn dot fujitsu.com
  Target Milestone: ---

In the examples below, gcc has opposite behavior when complie:

These examples are from:
https://www.openmp.org/wp-content/uploads/openmp-examples-5-0-1.pdf

4.5 Array Sections in Device Constructs
Example array_sections.2.c

As the declaration before the example says "This example shows the invalid
usage of two separate sections of the same array inside of a target constru=
ct"
and the text annotation in the example says, gcc shoud not compile
successfully.

However, gcc acts opposite when compile, details are as below:

test case:
-------------------------------------------------
Example array_sections.2.c
void foo ()
{
    int A[30], *p;
    #pragma omp target data map( A[0:4] )
  {
    p =3D &A[0];
    /* invalid because p[3] and A[3] are the same
     * location on the host but the array section
     * specified via p[...] is not a subset of A[0:4] */
    #pragma omp target map( p[3:20] )
    {
    A[2] =3D 0;
    p[8] =3D 0;
    }
  }
}

test command:
-------------------------------------------------
#gcc -v
Target: x86_64-pc-linux-gnu
Configured with:./.../configure=20
   --prefix=3D/.../=20
   --with-gmp=3D/.../gmp-6.1.0/=20
   --with-mpfr=3D/.../mpfr-3.1.4/=20
   --with-mpc=3D/.../mpc-1.0.3/=20
   --enable-multilib
Thread model: posix
gcc version 11.0.0 20200519 (experimental) (GCC)

#gcc -fopenmp -I/.../include Example array_sections.2.c

-------------------------------------------------=