Re: [eigen] on extern template instanciation

[Benoît Jacob <jacob@xxxxxxxxxxxxxxx>]

On Saturday 14 June 2008 12:23:59 Gael Guennebaud wrote:
> what about the following: we give two levels to
> EIGEN_EXTERN_INSTANTIATIONS. so:
>  if EIGEN_EXTERN_INSTANTIATIONS==1 then we only declare the extern
> templates if EIGEN_EXTERN_INSTANTIATIONS==2 then we declare the extern
> templates + hide the heavy code using a pair of #if
> EIGEN_EXTERN_INSTANTIATIONS<2 / #endif
>
> that's a bit complicated for the user:
> - if he does not need  -finline-functions then define it to 1
> - otherwise define it to 2 and take care when you use non-common types
> (i.e re-define EIGEN_EXTERN_INSTANTIATIONS=1 before including eigen
> headers)

I think that solution is a good workaround for now.

> but I cannot see a better solution until gcc changes this behavior.
>
> FYI, I suggested that could be a gcc bug on gcc-help and if I don't
> get any reply soon I'll report a bug.

Good idea, by the time we have some users the bug might be already fixed  :)

Benoit

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