[Bug c++/22513] [4.0 regression] Miscompilation of std::list code in Boost.

["redi at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From redi at gcc dot gnu dot org  2005-07-17 10:00 -------
With mainline I still get no error.  With 4.0.2 I get some errors and then the
final assertion is triggered (rather than a segfault) so using mudflap changes
the behaviour of the program:

g++40 -g  -static ptr_list.2.cc  -I ~/src/boost/ -fmudflap -lmudflap  && ./a.out
*******
mudflap violation 1 (check/read): time=1121593057.943466 ptr=0x743440 size=8
pc=0x408aec
location=`/home/data/redi/gcc/bin/4.0/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.0.2/../../../../include/c++/4.0.2/bits/stl_list.h:221
(std::_List_const_iterator<void*>::operator++)'
      [0x408aec]
      [0x40274f]
      [0x402841]
Nearby object 1: checked region begins 7337B after and ends 7344B after
mudflap object 0x7417c0: name=`malloc region'
bounds=[0x741780,0x741797] size=24 area=heap check=1r/1w liveness=2
alloc time=1121593057.943182 pc=0x40936c
      [0x40936c]
      [0x409b2c]
      [0x40feb8]
      [0x403ec9]
Nearby object 2: checked region begins 0B into and ends 7B into
mudflap dead object 0x743480: name=`malloc region'
bounds=[0x743440,0x743457] size=24 area=heap check=1r/1w liveness=2
alloc time=1121593057.943321 pc=0x40936c
      [0x40936c]
      [0x409b2c]
      [0x40feb8]
      [0x403ec9]
dealloc time=1121593057.943444 pc=0x408f4c
      [0x408f4c]
      [0x409f38]
      [0x401ef5]
      [0x401f1d]
number of nearby objects: 2
mf: assertion failure: `c.size() != c3.size()' in int main() at ptr_list.2.cc:25
Aborted

It looks like a good time for me to learn about mudflap and how to interpret
that output.  Thanks for the tip, Andrew.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22513