In gcc/:
	PR 23067
	* c-decl.c (start_struct): Don't create self-containing
	structures.
	* config/rs6000/rs6000.c (darwin_rs6000_special_round_type_align):
	New.
	* config/rs6000/rs6000-protos.h
	(darwin_rs6000_special_round_type_align): New.
	* config/rs6000/darwin.h (ADJUST_FIELD_ALIGN): Rewrite.
	(ROUND_TYPE_ALIGN): Use darwin_rs6000_special_round_type_align.
In gcc/testsuite/:
	PR 23067
	* gcc.target/powerpc/darwin-abi-3.c: Remove XFAIL.
	* gcc.target/powerpc/darwin-abi-6.c: Remove XFAIL.
	* gcc.target/powerpc/darwin-abi-7.c: Remove XFAIL.
	* gcc.target/powerpc/darwin-abi-8.c: Remove XFAIL.
	* gcc.target/powerpc/darwin-abi-9.c: Remove XFAIL.
	* gcc.target/powerpc/darwin-abi-10.c: Remove XFAIL.
	* gcc.target/powerpc/darwin-abi-11.c: Remove XFAIL.
In libobjc/:
	* encoding.c (darwin_rs6000_special_round_type_align): New.
In libffi/:
	* src/powerpc/ffi_darwin.c (darwin_adjust_aggregate_sizes): New.
	(ffi_prep_cif_machdep): Call darwin_adjust_aggregate_sizes for
	Darwin.
	* testsuite/libffi.call/nested_struct4.c: Remove Darwin XFAIL.
	* testsuite/libffi.call/nested_struct6.c: Remove Darwin XFAIL.

From-SVN: r118365