* c-parse.in (MODIFIED_WCHAR_TYPE): New macro.
	(c_common_nodes_and_builtins): Use it.
	(builtin_define_with_value): New function.
	(cb_register_builtins): Define __SIZE_TYPE__,
	__PTRDIFF_TYPE__, __WCHAR_TYPE__, and __WINT_TYPE__ here,
	using builtin_define_with_value.  Use consistent notation when
	defining __GXX_WEAK__.
	(WCHAR_TYPE_SIZE): Don't redefine.
	(combine_strings): Don't use WCHAR_TYPE_SIZE.

	* cppdefault.h: Don't provide defaults for SIZE_TYPE,
	PTRDIFF_TYPE, WCHAR_TYPE, or WINT_TYPE.
	* cppinit.c (builtin_array): Remove entries for __SIZE_TYPE__ etc.
	* tradcpp.c (initialize_builtins): Likewise.
	* gcc.c (cpp_unique_options): Don't muck with __WCHAR_TYPE__.

	* c-lex.h (builtin_define_with_value): Prototype.
	* system.h: Poison NO_BUILTIN_SIZE_TYPE, NO_BUILTIN_WCHAR_TYPE,
	NO_BUILTIN_PTRDIFF_TYPE, and NO_BUILTIN_WINT_TYPE.
	* doc/tm.texi: Remove mention of NO_BUILTIN_SIZE_TYPE etc.

	* config/avr/avr.h, config/h8300/h8300.h, config/i386/i386.h,
	config/ia64/ia64.h, config/mips/dec-osf1.h, config/mips/iris6.h,
	config/mips/linux.h, config/mips/mips.h, config/mips/netbsd.h,
	config/mips/osfrose.h, config/mips/sni-svr4.h, config/rs6000/aix51.h,
	config/s390/linux.h, config/sh/sh.h, config/sh/sh64.h,
	config/sparc/linux64.h, config/sparc/netbsd-elf.h,
	config/sparc/sol2-bi.h, config/sparc/sparc.h:
	Do not define NO_BUILTIN_SIZE_TYPE etc.  Remove all references
	to __SIZE_TYPE__ etc from all spec strings. When this makes
	extra specs empty, delete them.

From-SVN: r53472