Since adding to the bug description of Bug #35073 was impossible and the 
reported bug also affects release versions of GCC, I submit a cloned
version of this bug report.

Platform: PowerMac G5, Mac OSX Tiger, fully updated
Target platform: AVR

Binutils version installed for AVR: 2.18

+++ This bug was initially created as a clone of Bug #35073 +++

Building/bootstrapping today's gcc-trunk (rev. 132088/2008-02-04) for avr-rtems4.9 fails
with:
...
/users/rtems/src/toolchains/BUILD/avr-rtems4.9/./gcc/xgcc -B/users/rtems/src/toolchains/BUILD/avr-rtems4.9/./gcc/ -nostdinc -B/users/rtems/src/toolchains/BUILD/avr-rtems4.9/avr-rtems4.9/newlib/ -isystem /users/rtems/src/toolchains/BUILD/avr-rtems4.9/avr-rtems4.9/newlib/targ-include -isystem /users/rtems/src/toolchains/gcc-trunk/newlib/libc/include -B/opt/rtems-4.9/avr-rtems4.9/bin/ -B/opt/rtems-4.9/avr-rtems4.9/lib/ -isystem /opt/rtems-4.9/avr-rtems4.9/include -isystem /opt/rtems-4.9/avr-rtems4.9/sys-include -O2 -g -g -O2 -mmcu=avr35 -O2 -I../../../gcc-trunk/gcc/../newlib/libc/sys/rtems/include -O2 -g -g -O2   -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem ./include  -DDF=SF -Dinhibit_libc -mcall-prologues -Os -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -Dinhibit_libc  -I. -I. -I../../.././gcc -I../../../../../gcc-trunk/libgcc -I../../../../../gcc-trunk/libgcc/. -I../../../../../gcc-trunk/libgcc/../gcc -I../../../../../gcc-trunk/libgcc/../include   -o _mulsi3.o -MT _mulsi3.o -MD -MP -MF _mulsi3.dep -DL_mulsi3 -xassembler-with-cpp \
          -c ../../../../../gcc-trunk/libgcc/../gcc/config/avr/libgcc.S
../../../../../gcc-trunk/libgcc/../gcc/config/avr/libgcc.S: Assembler messages:
../../../../../gcc-trunk/libgcc/../gcc/config/avr/libgcc.S:281: Error: illegal opcode movw for mcu avr3
../../../../../gcc-trunk/libgcc/../gcc/config/avr/libgcc.S:283: Error: illegal opcode movw for mcu avr3
make[4]: *** [_mulsi3.o] Error 1
make[4]: Leaving directory `/users/rtems/src/toolchains/BUILD/avr-rtems4.9/avr-rtems4.9/avr35/libgcc'