gcc/
	* Makefile.in (COLLECT2_OBJS): Add collect2-aix.o.
	(collect2.o): Depend on collect2-aix.h.
	(collect2-aix.o): New rule.
	* collect2-aix.h: New file.
	* collect2-aix.c: Likewise.
	* collect2.c: Include collect2-aix.h.  Don't undefine
	OBJECT_FORMAT_COFF if CROSS_AIX_SUPPORT is defined.
	Guard native includes with #ifndef CROSS_DIRECTORY_STRUCTURE.
	Use TARGET_AIX_VERSION instead of _AIX51.
	* config/rs6000/aix43.h (TARGET_AIX_VERSION): Define.
	* config/rs6000/aix51.h (TARGET_AIX_VERSION): Likewise.
	* config/rs6000/aix52.h (TARGET_AIX_VERSION): Likewise.
	* config/rs6000/aix53.h (TARGET_AIX_VERSION): Likewise.
	* config/rs6000/aix61.h (TARGET_AIX_VERSION): Likewise.

From-SVN: r148096