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From: "townsend at astro dot wisc.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/99169] New: Segfault when passing allocatable scalar
 into intent(out) dummy argument
Date: Fri, 19 Feb 2021 17:31:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99169

            Bug ID: 99169
           Summary: Segfault when passing allocatable scalar into
                    intent(out) dummy argument
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: townsend at astro dot wisc.edu
  Target Milestone: ---

Created attachment 50222
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50222&action=3Dedit
Minimal working example

I've encountered a problem when passing an allocatable (and alread allocate=
d)
scalar as an actual argument to a procedure with an intent(out) (but not
allocatable) dummy argument. The attached code illustrates the problem.=20

Compiling with gfortran 10.2.0 at optimization level -O1 or -O2 leads to a
segmentation fault at runtime. The segfault arises when the dummy is assign=
ed
within set_i(). This problem does not arise at optimization level -O0, and =
the
program performs as expected (outputting '5' to the terminal).

The problem also seems to disappear when set_i() is a CONTAINed procedure in
the main program, rather than a module procedure.

cheers,

Rich=