[Bug c++/15440] New: mainline C++ code generation bug at -O2

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

The attached testcase compiles without complaints. But when compiled
at -O2, running the generated executable produces a segmentation fault.
This problem was present on tree-ssa but not on pre-merge mainline.
Unfortunately I have failed to reduce the testcase further.

~/tmp>g++ -O2 -v bug.ii
Reading specs from /afs/mpa/data/martin/ugcc/lib/gcc/i686-pc-linux-gnu/3.5.0/spe
cs
Configured with: /scratch/gcc/configure --quiet --prefix=/afs/mpa/data/martin/ug
cc --enable-languages=c++
Thread model: posix
gcc version 3.5.0 20040514 (experimental)
 /afs/mpa/data/martin/ugcc/libexec/gcc/i686-pc-linux-gnu/3.5.0/cc1plus -fpreproc
essed bug.ii -quiet -dumpbase bug.ii -mtune=pentiumpro -auxbase bug -O2 -version
 -o /tmp/ccqlUGQX.s
GNU C++ version 3.5.0 20040514 (experimental) (i686-pc-linux-gnu)
        compiled by GNU C version 3.5.0 20040514 (experimental).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
 as -V -Qy -o /tmp/ccmVEshX.o /tmp/ccqlUGQX.s
GNU assembler version 2.14 (i686-pc-linux-gnu) using BFD version 2.14 20030612
 /afs/mpa/data/martin/ugcc/libexec/gcc/i686-pc-linux-gnu/3.5.0/collect2 --eh-fra
me-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 /usr/lib/crt1.o /usr/lib/c
rti.o /afs/mpa/data/martin/ugcc/lib/gcc/i686-pc-linux-gnu/3.5.0/crtbegin.o -L/af
s/mpa/data/martin/ugcc/lib/gcc/i686-pc-linux-gnu/3.5.0 -L/afs/mpa/data/martin/ug
cc/lib/gcc/i686-pc-linux-gnu/3.5.0/../../.. /tmp/ccmVEshX.o -lstdc++ -lm -lgcc_s
 -lgcc -lc -lgcc_s -lgcc /afs/mpa/data/martin/ugcc/lib/gcc/i686-pc-linux-gnu/3.5
.0/crtend.o /usr/lib/crtn.o

~/tmp>./a.out
Segmentation fault

-- 
           Summary: mainline C++ code generation bug at -O2
           Product: gcc
           Version: 3.5.0
            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=15440