svn 260311 breaks gcc builds on releng9 ?

Hi,
I am seeing an odd problem which seems to be triggered by svn260311

I have two machines running snapshots of stable/9 from last fall
(one 255898 sep.26, the other 258126 nov.14). All is amd64

Build a recent head (260311 and newer) with gcc fails on the sep.26 machine:

	...
	19:51:22 ===> gnu/usr.bin/cc/cc1plus (all)
	PROG CC       /media/bsd10/usr/home/luigi/FreeBSD/head/gnu/usr.bin/cc/cc1plus/../../../../contrib/gcc/main.c
	...
	PROG CC       /media/bsd10/usr/home/luigi/FreeBSD/head/gnu/usr.bin/cc/cc1plus/../../../../contrib/gcc/cp/except.c
	parser.o: In function `cp_parser_objc_tentative_protocol_refs_opt':
	parser.c:(.text+0x14665): undefined reference to `cp_objc_protocol_id_list'
	*** [cc1plus-dummy] Error code 1
	1 error

but works on the newer one.

svn 260310 builds on both.

I am a bit unclear on what is going on because the missing symbol
(cp_objc_protocol_id_list) only appears in the source file parser.c
and in a ChangeLog.apple file, so maybe it is generated and
the actual failure is at some earlier stage.

Hope this helps tracking the problem.

thanks
luigi