* config/rs6000/sysv4.h (SUBTARGET_SWITCHES): Add -mwindiss.
	(LINK_START_SPEC): Handle it.
	(LINK_OS_SPEC): Likewise.
	(CPP_SPEC): Likewise.
	(STARTFILE_SPEC): Likewise.
	(LIB_SPEC): Likewise.
	(ENDFILE_SPEC): Likewise.  Do not assume crtsavres.o is used on
	all platforms.
	(CRTSAVRES_DEFAULT_SPEC): New macro.
	(LIB_WINDISS_SPEC): New macro.
	(CPP_OS_WINDISS_SPEC): Likewise.
	(STARTFILE_WINDISS_SPEC): Likewise.
	(ENDFILE_WINDISS_SPEC): Likewise.
	(LINK_START_WINDISS_SPEC): Likewise.
	(LINK_OS_WINDISS_SPEC): Likewise.
	* config/rs6000/windiss.h: New file.

From-SVN: r53257