gcc/ChangeLog:

2015-05-05  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	* config/s390/driver-native.c: New file.
	* config/s390/x-native: New file.
	* config.host: Add new files for s390.
	* config/s390/s390.h (DRIVER_SELF_SPECS): Add support for -mtune=native
	and -march=native
	* config/s390/s390.opt (march): Likewise; add PROCESSOR_NATIVE
	* config/s390/s390-opts.h (enum processor_type): Ditto.
	* config/s390/s390.c (s390_option_override): Catch unhandled
	PROCESSOR_NATIVE