[Bug target/57357] Error with '-mno-sse' and include wchar.h

[thutt at vmware dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57357

--- Comment #5 from thutt at vmware dot com ---
(In reply to Andrew Pinski from comment #3)
> (In reply to thutt from comment #2)
> > Can you please explain why it's invalid to return a double if SSE is
> > disabled?
> > SSE is an x86-specific hardware implementation and has nothing to do with
> > language validity from my standpoint.
> 
> On x86_64 the ABI says doubles are returned (and passed) via the SSE
> registers.

Compiling the same program with

    gcc-4.8 -m64 -mno-sse -c -o /tmp/gungla.o /tmp/gungla.c

does not exhibit the issue.  

Is there simple explanation for the difference in behavior?