Previously, the `VTKM_ALWAYS_EXPORT` and `VTKM_NEVER_EXPORT` macros
used the gnu-specific `__attribute__` keyword. This change instead
uses the C++11 standard method of using `[[ ]]` as attributes.
Specifically, `__attribute(visibility("---"))` is changed to
`[[gnu::visibility("--")]]`.
The main impetus for this change is that `__attribute__` does not
seem to work with `[[deprecated]]` on GCC compilers. (For sure on
GCC 6. I didn't check all compiler versions.) This change was
recommended from
https://stackoverflow.com/questions/40886628/deprecated-attribute-visibility-default-in-gcc-6-2
This creates a minor backward incompatibility. We have always meant
for these macros to be used before the return type when used with
a function. However, GCC accepted placing `__attribute__` after
the return type. The C++11 `[[ ]]` cannot be placed there, so
some macros might have to be moved. Still, this was a broken
use that happened to work.
It is very easy to cause ODR violations with DeviceAdapterTagCuda.
If you include that header from a C++ file and a CUDA file inside
the same program we an ODR violation. The reasons is that the C++
versions will say the tag is invalid, and the CUDA will say the
tag is valid.
The solution to this is that any compilation unit that includes
DeviceAdapterTagCuda from a version of VTK-m that has CUDA enabled
must be invoked by the cuda compiler.
Mask objects allow you to specify which output values should be
generated when a worklet is run. That is, the Mask allows you to skip
the invocation of a worklet for any number of outputs.
`vtkm::cont::testing` now initializes with logging enabled and support
for device being passed on the command line, `vtkm::testing` only
enables logging.
Sandia National Laboratories recently changed management from the
Sandia Corporation to the National Technology & Engineering Solutions
of Sandia, LLC (NTESS). The copyright statements need to be updated
accordingly.
Redesigns the TBB and Serial backends and the vtkm::exec::Task concept so that
we can re-use the same launching logic for all Worklets, instead of generating
per worlet code. To keep the performance the same the TilingTask now is past
a range of indices to work on, rather than a single index.
Binary size reduction:
WorkletTests_SERIAL old - 19MB
WorkletTests_SERIAL new - 18MB
WorkletTests_TBB old - 39MB
WorkletTests_TBB new - 18MB
libvtkAcceleratorsVTKm old - 48MB
libvtkAcceleratorsVTKm new - 19MB
