* Makefile.in (DRIVER_DEFINES): Define ENABLE_SHARED_LIBGCC and

    * Makefile.in (DRIVER_DEFINES): Define ENABLE_SHARED_LIBGCC and
        NO_SHARED_LIBGCC_MULTILIB as required for the target.
        * gcc.c (init_spec): Massage the existing libgcc_spec into a
        variant that handles a shared libgcc.
        (process_command): Always validate -{static,shared}-libgcc.
        (do_spec_1): New 'M' case.
        * invoke.text (Link Options): Document -{static,shared}-libgcc.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@38762 138bc75d-0d04-0410-961f-82ee72b054a4