It helps to attach the patch!

On Mon, 6 May 2019 at 19:57, Paul Richard Thomas
<paul.richard.thomas@gmail.com> wrote:
>
> Unfortunately, this patch was still in the making at the release of
> 9.1. It is more or less self explanatory with the ChangeLogs.
>
> It should be noted that gfc_conv_expr_present could not be used in the
> fix for PR90093 because the passed descriptor is a CFI type. Instead,
> the test is for a null pointer passed.
>
> The changes to trans-array.c(gfc_trans_create_temp_array) have an eye
> on the future, as well as PR90355. I am progressing towards the point
> where all descriptors have 'span' set correctly so that
> trans.c(get_array_span) can be eliminated and much of the code in the
> callers can be simplified.
>
> Bootstrapped and regtested on FC29/x86_64 - OK for trunk and 9-branch?
>
> Paul
>
> 2019-05-06  Paul Thomas  <pault@gcc.gnu.org>
>
>     PR fortran/90093
>     * trans-decl.c (convert_CFI_desc): Test that the dummy is
>     present before doing any of the conversions.
>
>     PR fortran/90352
>     * decl.c (gfc_verify_c_interop_param): Restore the error for
>     charlen > 1 actual arguments passed to bind(C) procs.
>     Clean up trailing white space.
>
>     PR fortran/90355
>     * trans-array.c (gfc_trans_create_temp_array): Set the 'span'
>     field to the element length for all types.
>     (gfc_conv_expr_descriptor): The force_no_tmp flag is used to
>     prevent temporary creation, especially for substrings.
>     * trans-decl.c (gfc_trans_deferred_vars): Rather than assert
>     that the backend decl for the string length is non-null, use it
>     as a condition before calling gfc_trans_vla_type_sizes.
>     * trans-expr.c (gfc_conv_gfc_desc_to_cfi_desc): 'force_no_tmp'
>     is set before calling gfc_conv_expr_descriptor.
>     * trans.c (get_array_span): Move the code for extracting 'span'
>     from gfc_build_array_ref to this function. This is specific to
>     descriptors that are component and indirect references.
>     * trans.h : Add the force_no_tmp flag bitfield to gfc_se.
>
> 2019-05-06  Paul Thomas  <pault@gcc.gnu.org>
>
>     PR fortran/90093
>     * gfortran.dg/ISO_Fortran_binding_12.f90: New test.
>     * gfortran.dg/ISO_Fortran_binding_12.c: Supplementary code.
>
>     PR fortran/90352
>     * gfortran.dg/iso_c_binding_char_1.f90: New test.
>
>     PR fortran/90355
>     * gfortran.dg/ISO_Fortran_binding_4.f90: Add 'substr' to test
>     the direct passing of substrings as descriptors to bind(C).
>     * gfortran.dg/assign_10.f90: Increase the tree_dump count of
>     'atmp' to account for the setting of the 'span' field.
>     * gfortran.dg/transpose_optimization_2.f90: Ditto.