Use CMake to automatically set policies to NEW.

CMake 3.12 introduces a ...<max> syntax in the version given to
cmake_minimum_required to automatically set policies to NEW up
to that version. Use it to avoid listing policies explicitly.

CMake/VTKmConfig.cmake.in

@@ -53,7 +53,13 @@
 #
 #
 
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+if (CMAKE_VERSION VERSION_LESS "3.3")
+  message(FATAL_ERROR "VTK-m requires CMake 3.3+")
+endif()
+if("${CMAKE_GENERATOR}" MATCHES "Visual Studio" AND
+   CMAKE_VERSION VERSION_LESS "3.11")
+  message(FATAL_ERROR "VTK-m requires CMake 3.11+ when using the Visual Studio Generators")
+endif()
 
 @PACKAGE_INIT@
 

CMake/VTKmDeviceAdapters.cmake

@@ -48,6 +48,7 @@ if(VTKm_ENABLE_TBB AND NOT TARGET vtkm::tbb)
 endif()
 
 if(VTKm_ENABLE_OPENMP AND NOT TARGET vtkm::openmp)
+  cmake_minimum_required(VERSION 3.9...3.12 FATAL_ERROR)
   find_package(OpenMP 4.0 REQUIRED COMPONENTS CXX QUIET)
 
   add_library(vtkm::openmp INTERFACE IMPORTED GLOBAL)
@@ -62,7 +63,7 @@ if(VTKm_ENABLE_OPENMP AND NOT TARGET vtkm::openmp)
 endif()
 
 if(VTKm_ENABLE_CUDA AND NOT TARGET vtkm::cuda)
-  cmake_minimum_required(VERSION 3.9 FATAL_ERROR)
+  cmake_minimum_required(VERSION 3.9...3.12 FATAL_ERROR)
   enable_language(CUDA)
 
   #To work around https://gitlab.kitware.com/cmake/cmake/issues/17512

CMakeLists.txt

@@ -25,11 +25,11 @@
 # If you want CUDA support, you will need to have CMake 3.9 on Linux/OSX.
 # We require CMake 3.11 with the MSVC generator as the $<COMPILE_LANGUAGE:>
 # generator expression is not supported on older versions.
-cmake_minimum_required(VERSION 3.3)
+cmake_minimum_required(VERSION 3.3...3.12)
 project (VTKm)
 
 if(${CMAKE_GENERATOR} MATCHES "Visual Studio")
-  cmake_minimum_required(VERSION 3.11 FATAL_ERROR)
+  cmake_minimum_required(VERSION 3.11...3.12 FATAL_ERROR)
 endif()
 
 # Update module path

examples/clipping/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(Clipping CXX)
 
 #Find the VTK-m package

examples/contour_tree/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(ContourTree CXX)
 
 #Find the VTK-m package

examples/cosmotools/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(CosmoTools CXX)
 
 #Find the VTK-m package

examples/demo/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(VTKmDemo CXX)
 
 #Find the VTK-m package

examples/game_of_life/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(GameOfLife CXX)
 
 #Find the VTK-m package

examples/hello_world/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(HelloWorld CXX)
 
 #Find the VTK-m package

examples/histogram/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(Histogram CXX)
 
 #Find the VTK-m package

examples/isosurface/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(IsoSurface CXX)
 
 #Find the VTK-m package

examples/multi_backend/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(MultiBackend CXX)
 
 #Find the VTK-m package

examples/particle_advection/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(ParticleAdvection CXX)
 
 #Find the VTK-m package

examples/redistribute_points/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(RedistributePoints CXX)
 
 #Find the VTK-m package

examples/rendering/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(RenderingExample CXX)
 
 #Find the VTK-m package

examples/streamline/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(Streamline CXX)
 
 #Find the VTK-m package

examples/tau_timing/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(TauTiming CXX)
 
 #Find the VTK-m package

examples/temporal_advection/CMakeLists.txt

@@ -21,7 +21,7 @@
 ##=============================================================================
 
 #Find the VTK-m package
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(TemporalAdvection CXX)
 
 #Find the VTK-m package

examples/tetrahedra/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(Tetrahedra CXX)
 
 #Find the VTK-m package

examples/unified_memory/CMakeLists.txt

@@ -19,7 +19,7 @@
 ##  this software.
 ##
 ##=============================================================================
-cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.3...3.12 FATAL_ERROR)
 project(UnifiedMemory CXX)
 
 #Find the VTK-m package