Re: [boost] [optional] Strict Aliasing Warnings on Trunk

Subject: Re: [boost] [optional] Strict Aliasing Warnings on Trunk
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2009-12-17 08:47:25

Dean Michael Berris wrote:
> I've recently been seeing this error more and more especially on GCC with -Wall:
> 
>  /home/dean/boost/boost/optional/optional.hpp:407: warning:
> dereferencing pointer ‘<anonymous>’ does break strict-aliasing rules
>  /home/dean/boost/boost/optional/optional.hpp:427: note: initialized from here
> 
> and:
> 
>   /home/dean/boost/boost/function/function_base.hpp:321: warning:
> dereferencing type-punned pointer will break strict-aliasing rules
>   /home/dean/boost/boost/function/function_base.hpp:325: warning:
> dereferencing type-punned pointer will break strict-aliasing rules
> 
> This is on Linux and GCC 4.4.1.
> 
> I'm not an expert in this regard but is there a way to either silence
> or avoid these warnings? Anything you want me to try from my end?

This was discussed in the past, and some people claimed the warning was 
spurious.

I am personally not convinced whether it is spurious or not, however.