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From: "wddawson at ucdavis dot edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/97084] New: Openmp + Allocatable String Crashes
Date: Thu, 17 Sep 2020 10:28:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97084

            Bug ID: 97084
           Summary: Openmp + Allocatable String Crashes
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wddawson at ucdavis dot edu
  Target Milestone: ---

Minimal example
```
program test
  implicit none
  integer :: ii
  integer, parameter :: N =3D 80
  character(len=3D:), allocatable :: temp_string

  allocate(character(len=3DN) :: temp_string)

  !$omp parallel default(shared)
  !$omp do
  do ii =3D 1, N
     temp_string(ii:ii) =3D "#"
  end do
  !$omp end do
  !$omp end parallel
end program
```

When I compile with `gfortran main.f90 -fopenmp -o test ` I get the followi=
ng
error:
```
during GIMPLE pass: omplower
main.f90:9:0:

    9 |   !$omp parallel default(shared)
      |=20
internal compiler error: in gimplify_expr, at gimplify.c:13885
libbacktrace could not find executable to open
```
It fails with the following compilers:
```
GNU Fortran (Homebrew GCC 10.2.0) 10.2.0
```
```
GNU Fortran (Homebrew GCC 9.3.0) 9.3.0
```
But works with:
```
GNU Fortran (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
```

This is possibly related to 89621?=