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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/95947] PACK intrinsic returns blank strings when an
 allocatable character array with allocatable length is used
Date: Wed, 14 Dec 2022 20:28:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95947

--- Comment #5 from anlauf at gcc dot gnu.org ---
The dump tree shows near the pack intrinsic:

- for character(len=3D10):

    atmp.4.dtype =3D {.elem_len=3D10, .rank=3D1, .type=3D6};
    atmp.4.span =3D 10;
    atmp.4.data =3D 0B;
    atmp.4.offset =3D 0;
    _gfortran_pack_char (&atmp.4, 10, D.4308, D.4328, 0B, 10, 0);

- for character(len=3D:):

    atmp.5.dtype =3D {.elem_len=3D(unsigned long) slen.4, .rank=3D1, .type=
=3D6};
    atmp.5.span =3D (integer(kind=3D8)) SAVE_EXPR <(sizetype) NON_LVALUE_EX=
PR
<slen.4>>;
    atmp.5.data =3D 0B;
    atmp.5.offset =3D 0;
    slen.4 =3D 0;
    _gfortran_pack_char (&atmp.5, &slen.4, D.4314, D.4334, 0B, .n, 0);

So we seem to clobber the string length before calling pack.=