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From: "pault at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/84868] [11/12/13/14 Regression] ICE in
 gfc_conv_descriptor_offset, at fortran/trans-array.c:208
Date: Fri, 26 Apr 2024 09:51:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D84868

Paul Thomas <pault at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |pault at gcc dot gn=
u.org
                 CC|                            |pault at gcc dot gnu.org

--- Comment #14 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to G. Steinmetz from comment #0)
> Changed between 20161204 and 20161211 :
>=20
>=20
> $ cat z1.f90
> module m
>    character(:), allocatable :: c
> contains
>    function f(n) result(z)
>       character, parameter :: c(3) =3D ['x', 'y', 'z']
>       integer, intent(in) :: n
>       character(len_trim(c(n))) :: z
>       z =3D c(n)
>    end
> end
> program p
>    use m
>    print *, f(2)
> end
>=20
>=20
> $ gfortran-7-20161204 -c z1.f90
> $
> $ gfortran-8-20180311 -c z1.f90
> z1.f90:13:0:
>=20
>     print *, f(2)
>=20
> internal compiler error: in gfc_conv_descriptor_offset, at
> fortran/trans-array.c:208
> 0x74e222 gfc_conv_descriptor_offset
>         ../../gcc/fortran/trans-array.c:208
> 0x75349c gfc_conv_descriptor_offset_get(tree_node*)
>         ../../gcc/fortran/trans-array.c:220
> 0x75349c gfc_conv_array_offset(tree_node*)
>         ../../gcc/fortran/trans-array.c:2967
> 0x75349c gfc_conv_array_ref(gfc_se*, gfc_array_ref*, gfc_expr*, locus*)
>         ../../gcc/fortran/trans-array.c:3575
> 0x780ddd gfc_conv_variable
>         ../../gcc/fortran/trans-expr.c:2737
> 0x77db02 gfc_conv_expr(gfc_se*, gfc_expr*)
>         ../../gcc/fortran/trans-expr.c:7926
> 0x78a98c gfc_conv_intrinsic_function_args
>         ../../gcc/fortran/trans-intrinsic.c:223
> 0x79dc3d gfc_conv_intrinsic_len_trim
>         ../../gcc/fortran/trans-intrinsic.c:6248
> 0x79dc3d gfc_conv_intrinsic_function(gfc_se*, gfc_expr*)
>         ../../gcc/fortran/trans-intrinsic.c:9134
> 0x77d545 gfc_conv_function_expr
>         ../../gcc/fortran/trans-expr.c:6784
> 0x77dae2 gfc_conv_expr(gfc_se*, gfc_expr*)
>         ../../gcc/fortran/trans-expr.c:7918
> 0x77fa8a gfc_apply_interface_mapping(gfc_interface_mapping*, gfc_se*,
> gfc_expr*)
>         ../../gcc/fortran/trans-expr.c:4409
> 0x77b6f7 gfc_conv_procedure_call(gfc_se*, gfc_symbol*, gfc_actual_arglist=
*,
> gfc_expr*, vec<tree_node*, va_gc, vl_embed>*)
>         ../../gcc/fortran/trans-expr.c:5970
> 0x77d59c gfc_conv_function_expr
>         ../../gcc/fortran/trans-expr.c:6808
> 0x77dae2 gfc_conv_expr(gfc_se*, gfc_expr*)
>         ../../gcc/fortran/trans-expr.c:7918
> 0x7843aa gfc_conv_expr_reference(gfc_se*, gfc_expr*)
>         ../../gcc/fortran/trans-expr.c:8018
> 0x7a3d56 gfc_trans_transfer(gfc_code*)
>         ../../gcc/fortran/trans-io.c:2585
> 0x749ec7 trans_code
>         ../../gcc/fortran/trans.c:2044
> 0x7a1807 build_dt
>         ../../gcc/fortran/trans-io.c:2027
> 0x749ee7 trans_code
>         ../../gcc/fortran/trans.c:2016

This, I believe, was commit 345bd7ebbb38f0e1d5acf33ab3f680111cfa7871 where
LEN_TRIM was introduced to interface mapping on 2016-12-09 for pr44265.
Removing the chunk concerned does not fix the problem.

I have stared at this for ages. For reasons that I cannot see, the use
associated version of 'c' is being used, so the interface mapping has faile=
d.

I will come back to this.

Paul=