[Dune] Hint: problem in mpihelper

[Oliver Sander]

Hi Bernard, hi Dune!

Static member variables should not be defined in headers.  Instead,
an mpihelper.cc is needed which contains the definitions and is
compiled to become a part of libcommon.

Oliver

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* Oliver Sander                ** email: sander at mi.fu-berlin.de        *
* Freie Universität Berlin     ** phone: + 49 (30) 838 75217           *
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On Tue, 26 Sep 2006, Bernard Haasdonk wrote:

> Hello Duners,
>
> I have different compilation modules, which are based on Dune components and 
> I get a "multiple definitions" linkage error of the static member variables 
> FakeMPIHelper::instance_ and MPIHelper::instance_
> in mpihelper.hh. Indeed these variables are defined explicitly in that header 
> file, which makes it only includable in one object file.
> I guess it is suggested to be more flexible.
>
> For my local work, putting the whole classes in an anonymous namespace works 
> fine as a workaround. However, I do not dare to implement a general solution.
>
> Bye,
>
>   Bernard
>
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