Re: [eigen] on extern template instanciation

[Benoît Jacob <jacob@xxxxxxxxxxxxxxx>]

On Friday 13 June 2008 18:27:29 Gael Guennebaud wrote:
> actually GCC implements extern template for a while, gcc3 supports it, like
> MSVC. But that's good to know it's going to be a real standard :)

cool, great that it works on gcc3, that means it'd even be ok for KDE.

>
> hm... with the explicit instanciation of all classes of the QR modules and
> 8 matrix types the compilation time of the lib is much much higher: ~1min
> for ~400KB (release mode).

ah ok so I was comparing apples and oranges.

> That's not huge at all if we compare to other 
> linear algebra package (e.g., Intel's one, but this is true for many
> others) which requires a couple of MB only for the matrix-matrix products
> (abusive unrolling).

Anyway, the compilation time of the library (if any) is not a problem, since 
it only annoys us and people making eigen packages. What we don't want is to 
piss off our actual users :)

Benoit

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