[Bug middle-end/44164] New: [4.5.0] Aliasing bug triggered by Boost.Bind/Boost.Function

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

Using Boost.Bind/Boost.Function triggers what seems to be an aliasing bug with
G++ 4.5.0. The minimal test case (including Boost.Bind and Boost.Function) is
attached.

It works and no errors are detected by valgrind with either flags :
 -O0
 -O1
 -O2 -fno-inline
 -O2 -fno-strict-aliasing
 -Os

It crashes whith either flags and valgrind detects invalid reads :
 -02
 -O3

Everything works fine with gcc version 4.4.3 20100316.

There are no warnings using '-W -Wall -Wextra'.

Original bug report to boost mailing list :
 http://lists.boost.org/boost-users/2010/05/59020.php


-- 
           Summary: [4.5.0] Aliasing bug triggered by
                    Boost.Bind/Boost.Function
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: maxime at altribe dot org
 GCC build triplet: ../configure --prefix=/usr --enable-
                    languages=c,c++,fortran,objc
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44164