[Bug bootstrap/46856] New: [4.6 regression] internal compiler error in final_scan_insn breaks m68k-linux bootstrap

["mikpe at it dot uu.se" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46856

           Summary: [4.6 regression] internal compiler error in
                    final_scan_insn breaks m68k-linux bootstrap
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mikpe@it.uu.se


Attempting to bootstrap gcc-4.6-20101204 natively on m68k-linux fails with:

/mnt/scratch/objdir46/./prev-gcc/xgcc -B/mnt/scratch/objdir46/./prev-gcc/
-B/mnt/scratch/crap/m68k-unknown-linux-gnu/bin/
-B/mnt/scratch/crap/m68k-unknown-linux-gnu/bin/
-B/mnt/scratch/crap/m68k-unknown-linux-gnu/lib/ -isystem
/mnt/scratch/crap/m68k-unknown-linux-gnu/include -isystem
/mnt/scratch/crap/m68k-unknown-linux-gnu/sys-include    -c   -g -O2 -gtoggle
-DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototypes -Wmissing-format-attribute -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings -Werror -Wold-style-definition
-Wc++-compat   -DHAVE_CONFIG_H -I. -I. -I/mnt/scratch/gcc-4.6-20101204/gcc
-I/mnt/scratch/gcc-4.6-20101204/gcc/.
-I/mnt/scratch/gcc-4.6-20101204/gcc/../include
-I/mnt/scratch/gcc-4.6-20101204/gcc/../libcpp/include
-I/home/mikpe/pkgs/linux-m68k/gmp-4.3.2/include
-I/home/mikpe/pkgs/linux-m68k/mpfr-2.4.2/include
-I/home/mikpe/pkgs/linux-m68k/mpc-0.8.2/include 
-I/mnt/scratch/gcc-4.6-20101204/gcc/../libdecnumber
-I/mnt/scratch/gcc-4.6-20101204/gcc/../libdecnumber/dpd -I../libdecnumber   
/mnt/scratch/gcc-4.6-20101204/gcc/haifa-sched.c -o haifa-sched.o
/mnt/scratch/gcc-4.6-20101204/gcc/haifa-sched.c: In function
'rank_for_schedule':
/mnt/scratch/gcc-4.6-20101204/gcc/haifa-sched.c:1293:1: internal compiler
error: in final_scan_insn, at final.c:2608
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[3]: *** [haifa-sched.o] Error 1
make[3]: Leaving directory `/mnt/scratch/objdir46/gcc'
make[2]: *** [all-stage2-gcc] Error 2
make[2]: Leaving directory `/mnt/scratch/objdir46'
make[1]: *** [stage2-bubble] Error 2
make[1]: Leaving directory `/mnt/scratch/objdir46'
make: *** [bootstrap] Error 2

Current gcc-4.4 and 4.5 do bootstrap on this machine so this is a regression.

I'll attach a reduced test case that ICEs a cross to m68k-linux.