dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

On 19/01/11 09:44, Andre Massing wrote:
> Den 18.01.11 21.46, skrev Garth N. Wells:
>>
>>
>> On 18/01/11 20:28, Florian Rathgeber wrote:
>>> Hi,
>>>
>>> Just a sneak preview: when using the current boost release 1.45.0 (which
>>> isn't packaged on the major distributions yet) DOLFIN build breaks:
>>>
>>> In IntersectionOperatorImplementation there are conflicts with
>>> boost::optional and the
>>>    error: dereferencing pointer \u2018<anonymous>\u2019 does break
>>> strict-aliasing rules
>>> is thrown (boost/optional/optional.hpp 317, 424)
>>>
>>> It works using gcc 4.5 though, hence it shouldn't be much of a problem
>>> (unless of course you want to use CUDA: nvcc isn't compatible to gcc
>>> 4.5).
>>>
>>
>> Thanks - useful to be proactive in resolving issues like this.
>>
>> It looks like boost::optional is being used as a bit of sugar.
>>
>> Andre: can it be easily removed?
> 
> It it actually used by the CGAL search tree and as such part of the CGAL
> code. I wrapped it such that it is not visible in the upper layers but
> as long as we want to have the "find any intersected entity"
> functionality via CGAL it is unfortunately not possible to get rid of
> boost::optional.
> 

OK.

>From a quick search, it seems that the problem is a gcc 4.4 bug. I guess
we can just leave it for the time being (disabling -Werror should allow
code to compile), and wait to see if any major distros have Boost 1.45 +
gcc 4.4.

Garth

> -- 
> Andre
> 
> 
>>
>> Garth
>>
>>> Florian
>>
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