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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/102966] size() returns 0 for an unallocated array, no
 error message or error exit
Date: Wed, 27 Oct 2021 19:20:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102966

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-10-27
      Known to work|                            |11.2.1, 12.0
             Status|UNCONFIRMED                 |WAITING
                 CC|                            |anlauf at gcc dot gnu.org
     Ever confirmed|0                           |1
      Known to fail|                            |10.3.1

--- Comment #2 from anlauf at gcc dot gnu.org ---
This is fixed in mainline for gcc-12 and 11-branch:

% gfc-11 zyx.f90 -fcheck=3Dall -g
% ./a.out=20
At line 3 of file zyx.f90
Fortran runtime error: Allocatable argument 'ar' is not allocated

Error termination. Backtrace:
#0  0x4007f8 in test
        at /home/anlauf/gcc-bugs/zyx.f90:3
#1  0x400887 in main
        at /home/anlauf/gcc-bugs/zyx.f90:4

One would need to bisect which patch fixed this.

Recommendation: upgrade to a newer compiler version.=