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Date: Wed, 25 Mar 2020 13:55:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94329

            Bug ID: 94329
           Summary: gcc-9: error: use_only.f90: =E2=80=98-fcompare-debug=E2=
=80=99 failure
                    (length)
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---

Fails since GCC 4.9.0:

$ cat use_only.f90
SUBROUTINE r_to_s1b ( s, hinv )
REAL hinv(:,:)=20=20=20=20=20
DO I=3D1,3
DO J=3D1,3
S =3D hinv(i,j)
END DO
END DO
END

$ gcc -Werror -fcompare-debug -O1 -fno-tree-loop-optimize -fwrapv -c
use_only.f90
gcc: error: use_only.f90: =E2=80=98-fcompare-debug=E2=80=99 failure (length=
)=