Re: [Boost-users] Valgrind false positive in make_shared

Subject: Re: [Boost-users] Valgrind false positive in make_shared
From: Dave Steffen (dave.steffen_at_[hidden])
Date: 2010-11-30 17:41:29

On Tuesday, November 30, 2010 01:46:39 pm Dave Steffen wrote:
> On Tuesday, November 30, 2010 03:40:14 am Peter Dimov wrote:
> > Dave Steffen wrote:
> > >  Hi
> > >  
> > >   Coming back to this issue after a week or two...  trying the above
> > 
> > [changing to std::forward]
> > 
> > >   made no difference: no compiler warnings, and no change in
> > >   Valgrind's error messages.
> > 
> > Looks like a g++ bug then. You should try reproducing it in a
> > self-contained example and report it to the GCC Bugzilla. I'm not sure
> > what we can do on our end to avoid it. (I'll switch to std::forward in
> > any case, since this seems a good idea in general, but it won't help in
> > this specific case.)
> 
>   I reported this as GCC bug 46732.  You can see the whole discussion
>   at
> 
>   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46732
> 
>   but the short version is:
> 
>     There was a defect in the language, core issue 664
>     http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#664
> 
>     GCC 4.4 predates that issue being resolved, so the only real workaround
> is to
>     avoid using -std=c++0x with GCC 4.4
> 
>  (thanks to Jonathan Wakely for getting to this so quickly)

   ... and as a last note, GCC 4.5.1 compiles the code cleanly, and
   Valgrind finds nothing to object to.

   Thanks!

-- 
Dave Steffen, Ph.D. - Software Engineer
Numerica Corporation <http://www.numerica.us>
4850 Hahns Peak Drive, Suite 200
Loveland, Colorado 80538
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Email: dave.steffen_at_[hidden]
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