[Bug c++/48211] [4.7 Regression] [C++0x] Segment Fault When Compiling

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48211

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-invalid-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.05.03 21:00:51
      Known to work|                            |4.5.2, 4.6.0
            Summary|[C++0x] Segment Fault When  |[4.7 Regression] [C++0x]
                   |Compiling                   |Segment Fault When
                   |                            |Compiling
     Ever Confirmed|0                           |1
      Known to fail|                            |4.7.0

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-05-03 21:00:51 UTC ---
I can confirm this with the 4.7-20110430 snapshot, but only on i686 not x86_64

The code in comment 2 gets a segfault here:

Program received signal SIGSEGV, Segmentation fault.
0x08336684 in ggc_set_mark (p=0xb6f7a878) at
../../gcc-4.7-20110430/gcc/ggc-page.c:1333
1333      if (entry->in_use_p[word] & mask)
(gdb) p entry
$1 = (page_entry *) 0x9014f48
(gdb) p word
$2 = 8699297
(gdb) p entry->in_use_p
$3 = {4293918719}

Valgrind shows lots of errors in cpp.  The code is not valid, I don't know if
the ICE also happens with a fixed version.

The code in comment 1 does not ICE