2007-10-29  Paul Thomas  <pault@gcc.gnu.org>

        PR fortran/31217
        PR fortran/33811
        PR fortran/33686
        * trans-array.c (gfc_conv_loop_setup): Send a complete type to
        gfc_trans_create_temp_array if the temporary is character.
        * trans-stmt.c (gfc_trans_assign_need_temp): Do likewise for
        allocate_temp_for_forall_nest.
        (forall_replace): New function.
        (forall_replace_symtree): New function.
        (forall_restore): New function.
        (forall_restore_symtree): New function.
        (forall_make_variable_temp): New function.
        (check_forall_dependencies): New function.
        (cleanup_forall_symtrees): New function.
        gfc_trans_forall_1): Add and initialize pre and post blocks.
        Call check_forall_dependencies to check for all dependencies
        and either trigger second forall block to copy temporary or
        copy lval, outside the forall construct and replace all
        dependent references. After assignment clean-up and coalesce
        the blocks at the end of the function.
        * gfortran.h : Add prototypes for gfc_traverse_expr and
        find_forall_index.
        expr.c (gfc_traverse_expr): New function to traverse expression
        and visit all subexpressions, under control of a logical flag,
        a symbol and an integer pointer. The slave function is caller
        defined and is only called on EXPR_VARIABLE.
        (expr_set_symbols_referenced): Called by above to set symbols
        referenced.
        (gfc_expr_set_symbols_referenced): Rework of this function to
        use two new functions above.
        * resolve.c (find_forall_index): Rework with gfc_traverse_expr,
        using forall_index.
        (forall_index): New function used by previous.
        * dependency.c (gfc_check_dependency): Use gfc_dep_resolver for
        all references, not just REF_ARRAY.
        (gfc_dep_resolver): Correct the logic for substrings so that
        overlapping arrays are handled correctly.

2007-10-29 Paul Thomas <pault@gcc.gnu.org>

        PR fortran/31217
        PR fortran/33811
        * gfortran.dg/forall_12.f90: New test.

        PR fortran/33686
        * gfortran.dg/forall_13.f90: New test.

From-SVN: r129720