decl.c (gnat_to_gnu_entity): Create IMPORTED_DECL nodes to describe the subprogram renamings which are...

2015-11-12  Pierre-Marie de Rodat  <derodat@adacore.com>

        * gcc-interface/decl.c (gnat_to_gnu_entity): Create
        IMPORTED_DECL nodes to describe the subprogram renamings which
        are relevant at debug time.
        * gcc-interface/gigi.h (get_debug_scope): Add declaration.
        * gcc-interface/trans.c (Identifier_to_gnu): Consider
        N_Defining_Operator_Symbol as valid entities.
        (gnat_to_gnu): Handle N_Defining_Operator_Symbol the same way as
        other entities.  Introduce a specific handling for
        N_Subprogram_Renaming_Declaration: call gnat_to_gnu_entity on
        the entity defined for relevant ones.
        (process_decls): Process subprogram renaming declarations during
        the second pass only.
        * gcc-interface/utils.c (get_debug_scope): Make it external.
        Consider N_Defining_Operator_Symbol as valid entities.
        (gnat_write_global_declarations): Output debugging information
        for top-level imported declarations.
        * gcc-interface/Makefile.in: Fix typo.

From-SVN: r230227