[Bug 972648] Re: ICE (segfault) in gsi_for_stmt

[Sleep Less]

FWIW, uweigand's test case still fails with

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.6.3-1ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.6 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) 

$ cat /etc/issue
Ubuntu 12.04.1 LTS \n \l


I mean I don't understand why Precise (12.04.1) still ships with this partially broken compiler, although apparently a fix is available since quite a while.

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https://bugs.launchpad.net/bugs/972648

Title:
  ICE (segfault) in gsi_for_stmt

Status in Linaro GCC:
  Fix Released
Status in “gcc-4.6” package in Ubuntu:
  Fix Released
Status in “gcc-4.6” source package in Precise:
  Confirmed

Bug description:
  seen with 4.6.3 on at least amd64

  $ g++ -c -O3 sparsmat.ii 
  sparsmat.cc: In function ‘long int smExpBound(ideal, int, int, int)’:
  sparsmat.cc:216:37: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  sparsmat.cc:217:37: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  sparsmat.cc: In function ‘BOOLEAN _ZL11smIsNegQuotP8spolyrecS0_S0_.part.12(poly, poly, poly)’:
  sparsmat.cc:1948:16: internal compiler error: Segmentation fault
  Please submit a full bug report,
  with preprocessed source if appropriate.

  
  Program received signal SIGSEGV, Segmentation fault.
  0x00000000006b903e in gsi_for_stmt ()
  (gdb) bt
  #0  0x00000000006b903e in gsi_for_stmt ()
  #1  0x00000000004904ef in ?? ()
  #2  0x0000000000865c73 in ?? ()
  #3  0x0000000000732779 in execute_one_pass ()
  #4  0x0000000000732a35 in execute_pass_list ()
  #5  0x0000000000732a47 in execute_pass_list ()
  #6  0x00000000007ffc11 in tree_rest_of_compilation ()
  #7  0x000000000094440f in ?? ()
  #8  0x00000000009460ba in cgraph_optimize ()
  #9  0x00000000009464ba in cgraph_finalize_compilation_unit ()
  #10 0x00000000004f7af1 in cp_write_global_declarations ()
  #11 0x00000000007c447e in toplev_main ()
  #12 0x00007ffff6f4576d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
  #13 0x000000000049f889 in _start ()

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