Makefile.in (DRIVER_DEFINES): Define ENABLE_SHARED_LIBGCC and NO_SHARED_LIBGCC_MULTILIB as required for the...
* 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.