ICE during bootstrap on Ubuntu 11.10/amd64

[Matt <matt at use dot net>]

Hey gang,

I wanted to see if I'm missing something obvious before I file a bug on 
this. With svn r181272, I am doing:

$ ../configure --enable-bootstrap --prefix=/home/matt 
--enable-languages=c,c++ --enable-stage1-checking=all
[...]
$ make
[...]

/home/matt/src/gcc-trunk/obj/./gcc/xgcc 
-B/home/matt/src/gcc-trunk/obj/./gcc/ 
-B/home/matt/x86_64-unknown-linux-gnu/bin/ 
-B/home/matt/x86_64-unknown-linux-gnu/lib/ -isystem 
/home/matt/x86_64-unknown-linux-gnu/include -isystem 
/home/matt/x86_64-unknown-linux-gnu/sys-include    -g -O2 -m32 -O2  -g -O2 
-DIN_GCC   -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual 
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem 
./include   -fpic -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector 
-fpic -I. -I. -I../../.././gcc -I../../../../libgcc -I../../../../libgcc/. 
-I../../../../libgcc/../gcc -I../../../../libgcc/../include 
-I../../../../libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT 
-DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF 
_muldi3.dep -DL_muldi3 -c ../../../../libgcc/libgcc2.c -fvisibility=hidden 
-DHIDE_EXPORTS
../../../../libgcc/libgcc2.c: In function __muldi3:
../../../../libgcc/libgcc2.c:553:3: internal compiler error: tree check: 
expected tree that contains typed structure, have block in 
fold_checksum_tree, at fold-const.c:13996

I get the same results when setting CC and CXX to be gcc-4.4 and g++-4.4 
respectively (the default system compiler on Ubuntu 11.10 is 4.6.1-based).

Running the commandline that causes the ICE with -O1 also elicits the 
problem. Setting BOOT_CFLAGS and CFLAGS to -O1 doesn't help matters.

Am I missing something, or is this a real bug?

Thanks!

--
tangled strands of DNA explain the way that I behave.
http://www.clock.org/~matt