A big part of the VTK-m find_package configuration is a set of
components that load different parts of VTK-m's configuration. If you
load none of the components, you do not actually get enough to compile
any part of VTK-m, which is confusing. To get around this, always load
the "Base" component.
There were a couple of places where the configure scripts did not add
either includes to VTKm_INCLUDE_DIRS or libraries to VTKm_LIBRARIES.
The biggest offender was when the examples used find_package to load the
VTK-m configuration it needed. find_package cleared out the includes and
libraries, but it did not clear out the VTKm_<COMPONENT>_FOUND
variables. Normally, these variables would not be set before
find_package is called, but in this case the examples were called after
some partial configuration. I got around this issue by clearing out all
the *_FOUND variables in VTKmConfig.cmake.
To detect what CUDA hardware is native, a simple CUDA program is
compiled. However, CMake was not necessarily pointing to the correct
source file, so the compile was failing.
This change makes sure that VTKm_CMAKE_MODULE_PATH is properly set and
uses that variable to find the source file.
Have VTK-m eat its own dog food when it comes to its configuration. Load
the same configuration for building VTK-m as would be loaded (more or
less) when using find_package(VTKm) in an external project.
This includes adding lots more components to the packages so that all the
setup (e.g. OpenGL, TBB, etc.) can be set up correctly. It is also a
significant change to how these components are declared. The component
configuration is simplified a bit and unified in a single file.
This is a little tricky since they don't seem to have considered that
you will have files in both the source and build directory or that the
file locations will not match exactly with the install locations.
* Support a REQUIRED flag that only gives an error if that flag is given.
* Move common configuration required for all devices (such as boost) to a
special device named Base.
* Make CUDA always capitalized to be consistent with the other CMake
variables.
* Rather than call include_directories, set a variable named
VTKm_INCLUDE_DIRS. This is consistent with how most CMake packages work.
* Make a CMake variable named VTKm_LIBRARIES containing all the
libraries the configured devices need.
* Automatically configure supported devices when loading the VTK-m
package in CMake.
