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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/77504] [8/9/10/11 Regression] "is used uninitialized"
 with allocatable string and array constructors
Date: Fri, 24 Jul 2020 15:57:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D77504

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kargl at gcc dot gnu.org

--- Comment #20 from kargl at gcc dot gnu.org ---
(In reply to Tiziano M=C3=BCller from comment #19)

>=20
> *** snip: modb.f90 ***
> module modb
>     use moda, only: funca
> contains
>    PURE SUBROUTINE funcb(oarr)
>       REAL, DIMENSION(:), INTENT(OUT)    :: oarr

intent(out) causes oarr to be deallocated on entry
into funcb().

>       REAL, ALLOCATABLE, DIMENSION(:, :) :: arr
>=20
>       oarr(:) =3D 0.0

oarr(:) is an array section of an unallocated array.
This is invalid Fortran.  So gfortran can do whatever
she wants with the code.

>       CALL funca(arr, ubound(oarr, 1))
>       oarr =3D MATMUL(TRANSPOSE(arr), oarr)*1.
>    END SUBROUTINE funcb
> end module
> *** end snip ***=