2014-10-06  Tobias Burnus  <burnus@net-b.de>

gcc/fortran/
        * libgfortran.h (GFC_STD_F2015): Add.
        * decl.c (gfc_match_implicit_none): Handle spec list.
        (gfc_match_implicit): Move double intrinsic warning here.
        * gfortran.h (gfc_namespace): Add has_implicit_none_export:1.
        (gfc_set_implicit_none): Update interface.
        * interface.c (gfc_procedure_use): Add implicit-none external
        error check.
        * parse.c (accept_statement): Remove call.
        (verify_st_order): Permit that external-implict-none follows
        implicit statement.
        * symbol.c (gfc_set_implicit_none): Handle external/type
        implicit none.

gcc/testsuite/
        * gfortran.dg/implicit_14.f90: New.
        * gfortran.dg/implicit_15.f90: New.
        * gfortran.dg/implicit_4.f90: Update dg-error.

From-SVN: r215914