[CMake] Confusion regarding usage of find_package and PATHS or HINTS

[Jean-Christophe Fillion-Robin]

Hi Jameson,

If your are "superbuild-ing" the associated project, you can simply
configure the project depending on these library by explicitly setting the
expected variable. That will be deterministic and you won't rely on a
search and find behavior.

Hth
Jc


On Tue, Jun 10, 2014 at 2:28 PM, jmerkow <jmerkow at gmail.com> wrote:

> I'm not the author of the libraries, and none of them are cmake friendly.
> So
> it doesn't make sense to create FOOconfig.cmake files for them. Using the
> command line -D  or adding env variables to add new search directories,
> seems like an unnecessary headache for the user (our windows users esp
> wouldn't enjoy it). Right now, they configure, specify the location of the
> externals directory (if it's not in one of the pre-subscribed location) and
> the libraries are found.
>
> Some do come with installation packages (commercial libs), but these are
> often unused, in favor of placing the libraries in some location. So using
> this method allows us to search in the externals directory, search in
> default locations, and specify specific locations (full path) to search for
> the libraries. I should also mention that many of these libraries have
> multiple libs files, not all of which are always needed, and can have
> interdependencies between packages. So if I have pacakageA and packageB, I
> need different libraries and headers from both packages them if I were to
> just have one.  All this logic is obv handled by the main project, and
> COMPONENTS arg is used indicate that a particular extra library/header is
> needed.
>
> Essentially, what I'm doing is using the same behavior for finding config
> files by adding HINTS/PATHS but looking for libraries instead of
> FOOConfig.cmake.
>
>
>
>
>
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