[vtk-developers] Checking if VTK was built with a particular group enabled

[Bill Lorensen]

I assume you get the listed components as well as the components they depend on?

On Fri, May 4, 2012 at 11:21 AM, Marcus D. Hanwell
<marcus.hanwell at kitware.com> wrote:
> On Fri, May 4, 2012 at 11:09 AM, David Doria <daviddoria at gmail.com> wrote:
>>> Yes.  Normally the above should report an error
>>>
>>>  No such module: vtkFiltersParallel
>>>
>>> but the test for it is broken in the case that vtkFiltersParallel
>>> was enabled in the same build tree in the past and is now disabled.
>>> This should fix it:
>>>
>>>  http://review.source.kitware.com/#/t/551
>>>
>>> -Brad
>>
>>
>> Thanks Brad, that seems to do it.
>>
>> Is it intended behavior that if a module is not listed in the
>> COMPONENTS list of find_package() it will not be available?
>>
>> For example, with this:
>>
>> FIND_PACKAGE(VTK REQUIRED COMPONENTS vtkViewsContext2D vtkChartsCore)
>>
>> my project builds, but with this:
>>
>> FIND_PACKAGE(VTK REQUIRED COMPONENTS vtkViewsContext2D)
>>
>> I get:
>> fatal error: vtkChartXY.h: No such file or directory
>
> That is correct behavior, vtkViewsContext2D does not depend on
> vtkChartsCore (soon to move - I will get on that). You want both
> components if you are using the vtkContextView and the charts.
>>
>> The project also builds correctly with only:
>> FIND_PACKAGE(VTK REQUIRED)
>
> That just finds everything that built.
>>
>> I had assumed that all modules that had been built were available by
>> default, and adding them to the REQUIRED COMPONENTS list was just
>> checking for them?
>>
> No, this behaves in much the same way as Boost where the
> BOOST_LIBRARIES variable is populated with the components you asked
> for. We diverge in that when you ask for nothing we give you
> everything by default.
>
> We need to write this up and make it clearer on the wiki.
>
> Marcus
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