This is the final patch (at least so far) that turns on -mfloat128 by default
for PowerPC Linux systems where the VSX instruction set is enabled.  As I
mentioned in the last email, because we don't build the __float128 emulator on
other systems, I didn't think it would be useful to make it the default.

I did a boostrap build/check with no regressions on a little endian power8
system.  Are the patches ok to check in?

[gcc]
2016-01-21   Michael Meissner  <meissner@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_option_override_internal): Enable
	-mfloat128 by default on PowerPC Linux systems with the VSX
	instruction enabled.

[gcc/testsuite]
2016-01-21   Michael Meissner  <meissner@linux.vnet.ibm.com>

	* gcc.target/powerpc/float128-1.c: New test for IEEE 128-bit
	floating point support.
	* gcc.target/powerpc/float128-2.c: Likewise.

-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797