[Boost-bugs] [Boost C++ Libraries] #4127: warning break strict-aliasing rules

Subject: [Boost-bugs] [Boost C++ Libraries] #4127: warning break strict-aliasing rules
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-04-20 18:07:58

#4127: warning break strict-aliasing rules
-------------------------------------+--------------------------------------
 Reporter:  anonymous                |       Owner:  pdimov   
     Type:  Bugs                     |      Status:  new      
Milestone:  Boost 1.43.0             |   Component:  smart_ptr
  Version:  Boost Development Trunk  |    Severity:  Problem  
 Keywords:  warning strict-aliasing  |  
-------------------------------------+--------------------------------------
 Hello,
 under x86_64, using g++ 4.4.1 with '-W -Wall -O3' , when trying to compile
 the code below
 [code]
 #include "boost/make_shared.hpp"
 #include <iostream>

 int main(void)
 {
   boost::shared_ptr<std::string> x =
 boost::make_shared<std::string>("hello, world!");
   std::cout << *x;
 }
 [/code] (copied from make_shared doc)

 I get the folowing warnings:
 >>> boost/smart_ptr/make_shared.hpp:52: warning: dereferencing type-punned
 pointer will break strict-aliasing rules

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4127>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.