[Insight-developers] USE_EXTERNAL cmake flag

[Gaëtan Lehmann]

Le 23 juin 11 à 06:58, Alexandre GOUAILLARD a écrit :

> gaetan,
>

Hi Alex,

> I just saw two new variables in ITK cmake configuration:
> ZLIB_USE_EXTERNAL and SZIP_USE_EXTERNAL.
>
> As we are using external for GCC_XML and we are planning to do so for
> swig as well, would it be interesting for us to do the same thing?
>

I think we are doing that already for gccxml, and will do that for  
swig as well.

> A global question now, there are now three ways of including  
> external libs:
> - getting the included ThirdParty Module when available
> - using a system install
> - using the external_project feature of cmake.
>
>
> what is the rationale when choosing between one or the other?
> Should we support all of them ?
> I remember that the rules about having ThirdParty modules are very
> clear (Licence, size, ...)
> Now the SYSTEM part is almost clear to me :-)
> But what about choosing between SYSTEM and external?
>

The external project is nice to simplify the user experience: he/she  
doesn't have to install a dependency if it is not installed on its  
computer. If the dependency is already installed, then it's better to  
simply use it.

I can't say when it's best to choose a ThirdParty module or an  
external project.

Maybe a cmake expert can help!

Gaëtan



-- 
Gaëtan Lehmann
Biologie du Développement et de la Reproduction
INRA de Jouy-en-Josas (France)
tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
http://mima2.jouy.inra.fr  http://www.itk.org
http://www.bepo.fr

-------------- next part --------------
A non-text attachment was scrubbed...
Name: PGP.sig
Type: application/pgp-signature
Size: 203 bytes
Desc: Ceci est une signature ?lectronique PGP
URL: <http://www.itk.org/mailman/private/insight-developers/attachments/20110623/138c750c/attachment.pgp>