[CMake] Path vs. name preference during search.

[Marcel Loose]

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Hi,

For more discussion on the search order of PATHS and NAMES used by the
different Find_* commands see, e.g.:

http://www.cmake.org/pipermail/cmake/2009-October/032565.html
http://www.cmake.org/pipermail/cmake/2010-March/035889.html
http://public.kitware.com/Bug/view.php?id=10718

The current CMake behaviour is not likely to change. IIRC, Bill
Hoffman once explained that the NAMES option was introduced to specify
name *aliases* like 'gtk' 'gtk12' in FindGTK.cmake. It was *not* meant
to specify a list of names for *different* entities.

Best regards,
Marcel Loose.

op 14-02-14 09:02, Jakub Zakrzewski schreef:
> Hi,
> 
> what about searching multiple times, each time giving only the path
> you want (in order of prefference)? If I'm correct, once the
> library is found, next attempts to find it againg will be a no-op.
> 
> 
> 
> --
> 
> Gruesse,
> 
> Jakub
> 
> 
> 
> 
> 
> *From:*CMake [mailto:cmake-bounces at cmake.org] *On Behalf Of *Rob
> McDonald *Sent:* Donnerstag, 13. Februar 2014 19:21 *To:*
> Jean-Christophe Fillion-Robin *Cc:* CMake ML *Subject:* Re: [CMake]
> Path vs. name preference during search.
> 
> 
> 
> Jc,
> 
> 
> 
> That is an approach I have thought about.  I even think I have
> looked at Slicer for how you work your CMake system.
> 
> 
> 
> I prefer to use project-supplied FindLIB.cmake (or a slightly
> modified version thereof) because some of them do more than just
> setting LIBRARY, INCLUDE_DIR, and FOUND variables.
> 
> 
> 
> Rather than duplicate everything done in the FindLIB.cmake script
> (which can have platform-dependent logic), I have gone the path of
> encouraging the FindLIB.cmake to find the one I want.
> 
> 
> 
> Rob
> 
> 
> 
> 
> 
> On Thu, Feb 13, 2014 at 10:09 AM, Jean-Christophe Fillion-Robin 
> <jchris.fillionr at kitware.com <mailto:jchris.fillionr at kitware.com>>
> wrote:
> 
> Hi Rob,
> 
> Do address the use case you described, I usually explicitly set the
> path the library when built as an external project and rely only on
> the find_* command for the use_system case.
> 
> See 
> https://github.com/Slicer/Slicer/blob/c5a39acf7af28ba82cc0097c84d1ebda89cce3b4/SuperBuild/External_teem.cmake#L13-16
>
>  Hth
> 
> Jc
> 
> 
> 
> On Thu, Feb 13, 2014 at 12:51 PM, Rob McDonald
> <rob.a.mcdonald at gmail.com <mailto:rob.a.mcdonald at gmail.com>>
> wrote:
> 
> When I search for a given library, specifying multiple possible 
> names and multiple hints for paths...
> 
> 
> 
> FIND_LIBRARY( FINDME_LIB
> 
> NAMES name1 name2 name3
> 
> HINTS path1 path2 path3
> 
> DOC "Library to find")
> 
> 
> 
> CMake seems to have a preference for name1, and it first searches 
> all HINTS for name1.  If it doesn't find name1, it moves to name2 
> and then searches all HINTS for name2, etc.
> 
> 
> 
> I would prefer to have a preference for path1, no matter the name. 
> Try for all names in path1, then move to path2, etc.
> 
> 
> 
> Is there a way to toggle this behavior?
> 
> 
> 
> Rob
> 
> 
> 
> 
> 
> Background...  Basically, I am using ExternalProject_Add to build
> a library.  However, to make it possible to use the system-library 
> instead, this is optional.  I use a FindThelib.cmake so the main 
> project works seamlessly either way.
> 
> 
> 
> I'm targeting the case where a version of this library is
> installed on the system, but I want to use my own copy.
> 
> 
> 
> The name of the library depends on build options and platform, so 
> controlling on the name is a little fragile.  However, I have 
> explicitly built it in a known directory, so having preference for 
> the known directory is desirable.
> 
> 
> 
> --
> 
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