UltraSPARC IIi fix.  Update README and build configury.
mark all vfp registers as used when done.

To avoid assigning registers the would fit, once arguments have been on
the stack, we mark all registers as used once we do not find a free
register for the first time.
stop trying to assing vfp regs once we are done with the registers
add a testcase for the double/float issue on ARMHF
Respect HAVE_ALLOCA_H
This enshrines the current testsuite practice of using ffi_arg for
returned values.  It would be reasonable and logical to use the actual
return argument type as passed to ffi_prep_cif, but this would mean
changing a large number of tests that use ffi_arg and all backends
that write results to an ffi_arg.
update Changelog
Merge branch 'master' of https://github.com/bivab/libffi

Conflicts:
	ChangeLog
Fix broken test cases
Fix sample closure code
The powerpc64 support opted to pass floating point values both in the
fpr area and the parameter save area, necessary when the backend
doesn't know if a function argument corresponds to the ellipsis
arguments of a variadic function.  This patch adds powerpc support for
variadic functions, and changes the code to only pass fp in the ABI
mandated area.  ELFv2 needs this change since the parameter save area
may not exist there.

This also fixes two faulty tests that used a non-variadic function
cast to call a variadic function, and spuriously reasoned that this is
somehow necessary for static functions..
This patch prepares for ELFv2, where sizes of these areas change.  It
also makes some minor changes to improve code efficiency.
The powerpc64 ABIs align structs passed by value, a fact ignored by
gcc for quite some time.  Since gcc now does the correct alignment,
libffi needs to follow suit.  This ought to be made selectable via
a new abi value, and the #ifdefs removed from ffi.c along with many
other #ifdefs present there and in assembly.  I'll do that with a
followup patch sometime.

This is a revised version of
https://sourceware.org/ml/libffi-discuss/2013/msg00162.html
Andreas' 2013-02-08 change reverted some breakage for struct return
values from 2011-11-12, but in so doing reintroduced string
instructions to sysv.S that are not supported on all powerpc variants.
This patch properly copies the bounce buffer to destination in C code
rather than in asm.

I have tested this on powerpc64-linux, powerpc-linux and
powerpc-freebsd.  Well, the last on powerpc-linux by lying to
configure with

CC="gcc -m32 -msvr4-struct-return -mlong-double-64" \
CXX="g++ -m32 -msvr4-struct-return -mlong-double-64" \
/src/libffi-current/configure --build=powerpc-freebsd

and then

make && make CC="gcc -m32" CXX="g++ -m32" \
RUNTESTFLAGS=--target_board=unix/-m32/-msvr4-struct-return/-mlong-double-64\
 check
Finally, this adds _CALL_ELF == 2 support.  ELFv1 objects can't be
linked with ELFv2 objects, so this is one case where preprocessor
tests in ffi.c are fine.  Also, there is no need to define a new
FFI_ELFv2 or somesuch value in enum ffi_abi.  FFI_LINUX64 will happily
serve both ABIs.
Finally, this adds _CALL_ELF == 2 support.  ELFv1 objects can't be
linked with ELFv2 objects, so this is one case where preprocessor
tests in ffi.c are fine.  Also, there is no need to define a new
FFI_ELFv2 or somesuch value in enum ffi_abi.  FFI_LINUX64 will happily
serve both ABIs.
Merge branch 'master' of github.com:/atgreen/libffi

Conflicts:
	ChangeLog
	src/powerpc/ffi.c
Merge branch 'master' of git://github.com/atgreen/libffi