Enable building shared libs with CUDA with VTKm >= 1.7 (#237)

* Enable building shared libs with CUDA with VTKm >= 1.7

* Add CUDA with shared CI test

Author: kwryankrattiger

azure-pipelines.yml

@@ -229,9 +229,14 @@ stages:
     timeoutInMinutes: 0
     strategy:
       matrix:
+        shared_vtkh:
+          BUILD_SHARED_LIBS: ON
+          CMAKE_BUILD_TYPE: Release
+          SPACK_SHARED_VARIANT: +shared
         static_vtkh:
           BUILD_SHARED_LIBS: OFF
           CMAKE_BUILD_TYPE: Release
+          SPACK_SHARED_VARIANT: ~shared
     steps:
       - checkout: self
         clean: boolean
@@ -266,7 +271,7 @@ stages:
            which python
            python --version
            # setup spack spec (must be static)
-           export SPACK_SPEC="%gcc+mpi+cuda~openmp~shared"
+           export SPACK_SPEC="%gcc+mpi+cuda~openmp"
            export SPACK_SPEC="${SPACK_SPEC}${SPACK_SHARED_VARIANT} ^vtk-m+cuda${SPACK_SHARED_VARIANT}"
            export SPACK_SPEC="${SPACK_SPEC} ^cmake~openssl~ncurses"
            echo $SPACK_SPEC

src/CMakeLists.txt

@@ -61,11 +61,6 @@ if(NOT ENABLE_SERIAL AND NOT ENABLE_MPI)
     "Please set ENABLE_SERIAL, ENABLE_MPI or both to ON")
 endif()
 
-
-if(ENABLE_CUDA AND BUILD_SHARED_LIBS)
-  message(FATAL_ERROR "Static libraries are required when building with CUDA")
-endif()
-
 if(ENABLE_CUDA)
     # ask politely a few times for SEPARABLE COMPILATION
     set (CMAKE_CUDA_SEPARABLE_COMPILATION ON CACHE BOOL "" )

src/cmake/thirdparty/SetupVTKm.cmake

@@ -64,6 +64,11 @@ if(ENABLE_CUDA AND NOT VTKm_ENABLE_CUDA)
    message(FATAL_ERROR "VTK-h CUDA support requires VTK-m with CUDA support (ENABLE_CUDA == TRUE, however VTKm_ENABLE_CUDA == FALSE")
 endif()
 
+if(ENABLE_CUDA AND BUILD_SHARED_LIBS)
+  if(VTKm_VERSION VERSION_LESS "1.7.0")
+    message(FATAL_ERROR "Cannot build shared libs with CUDA when VTKm is < v1.7.0")
+  endif()
+endif()
 
 set(VTKM_FOUND TRUE)