[Bug c/17723] New: [4.0.0 regression] [ICE on legal code] gcc segfaults with -O2

["martin at mpa-garching dot mpg dot de" <gcc-bugzilla at gcc dot gnu dot org>]

The attached testcase (sorry, no time to reduce its size) causes
current mainline to segfault:

>gcc -v -O2 -c bug.i
Reading specs from /afs/mpa/data/martin/ugcc/lib/gcc/i686-pc-linux-gnu/4.0.0/specs
Configured with: /scratch/gcc/configure --quiet
--prefix=/afs/mpa/data/martin/ugcc --enable-languages=c++,f95
--with-gmp=/afs/mpa/data/martin/mygmp
Thread model: posix
gcc version 4.0.0 20040929 (experimental)
 /afs/mpa/data/martin/ugcc/libexec/gcc/i686-pc-linux-gnu/4.0.0/cc1
-fpreprocessed bug.i -quiet -dumpbase bug.i -mtune=pentiumpro -auxbase bug -O2
-version -o /tmp/ccW802VQ.s
GNU C version 4.0.0 20040929 (experimental) (i686-pc-linux-gnu)
        compiled by GNU C version 4.0.0 20040929 (experimental).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
eval.l: In function 'fflex':
eval.l:518: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

-- 
           Summary: [4.0.0 regression] [ICE on legal code] gcc segfaults
                    with -O2
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: martin at mpa-garching dot mpg dot de
                CC: gcc-bugs at gcc dot gnu dot org,martin at mpa-garching
                    dot mpg dot de
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17723