* gcc.c (SWITCH_CURTAILS_COMPILATION): Definition.
        (DEFAULT_SWITCH_CURTAILS_COMPILATION): True for options -S and -c.
        (process_command): If HAVE_EXECUTABLE_SUFFIX is defined then scan
        command line arguments to see if an executable is not being
        created, and if so - do not append the suffix.
        * tm.texi (SWITCH_CURTAILS_COMPILATION): Add description of new
        driver macro.

From-SVN: r19824