[Bug c++/22591] [4.0 Regression] std::swap() followed by list::erase() produces incorrect list::begin()

[reichelt at gcc dot gnu dot org]

------- Additional Comments From reichelt at gcc dot gnu dot org  2005-07-22 
16:40 -------
Just another data point:

I just compiled the testcase (without including iostream) with -O3 -c
using 4.0 branch.
If I link this with libstdc++ from the 4.0 the assertion is triggered.
If I link this with libstdc++ from the 3.4 branch or mainline,
the assert is not triggered.
The same happens, if I use -O0 instead of -O3.

nm of the object file yields:

         U _Unwind_Resume
         U _ZNSt15_List_node_base4hookEPS_
         U _ZNSt15_List_node_base4swapERS_S0_
         U _ZNSt15_List_node_base6unhookEv
00000000 d _ZZ4mainE19__PRETTY_FUNCTION__
         U _ZdlPv
         U _Znwj
         U __assert_fail
         U __gxx_personality_v0
00000000 T main

So a miscompilation of _List_node_base::swap (or ::hook or ::unhook)
in libstdc++ seems to be very likely.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |reichelt at gcc dot gnu dot
                   |                            |org
   Target Milestone|---                         |4.0.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22591