Add support for clang-cl compilation on windows

CMake/FindTBB.cmake

@@ -203,12 +203,8 @@ if (WIN32 AND MSVC)
       list(APPEND TBB_LIB_SEARCH_PATH ${dir}/lib/ia32/${COMPILER_PREFIX})
     endif ()
   endforeach ()
-endif ()
-
-# For OS X binary distribution, choose libc++ based libraries for Mavericks (10.9)
-# and above and AppleClang
-if (CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND
-    NOT CMAKE_SYSTEM_VERSION VERSION_LESS 13.0)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND
+       NOT CMAKE_SYSTEM_VERSION VERSION_LESS 13.0)
   set (USE_LIBCXX OFF)
 
   if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
@@ -220,10 +216,8 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND
       list (APPEND TBB_LIB_SEARCH_PATH ${dir}/lib/libc++ ${dir}/libc++/lib)
     endforeach ()
   endif ()
-endif ()
-
-# check compiler ABI
-if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+  # check compiler ABI
   set(COMPILER_PREFIX)
   if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
     list(APPEND COMPILER_PREFIX "gcc4.7")

CMake/VTKmCPUVectorization.cmake

@@ -69,7 +69,8 @@ endif()
 # We currently don't know the vectorization flags for MSVC. But we want
 # the vtkm_vectorization_flags target to exist so we have a consistent
 # interface.
-if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" OR
+   CMAKE_CXX_SIMULATE_ID STREQUAL "MSVC")
   return()
 endif()
 

CMake/VTKmCompilerFlags.cmake

@@ -8,31 +8,22 @@
 ##  PURPOSE.  See the above copyright notice for more information.
 ##============================================================================
 
-if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-  set(VTKM_COMPILER_IS_GNU 1)
-endif()
-
-if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-  set(VTKM_COMPILER_IS_CLANG 1)
-endif()
-
-if(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
-  set(VTKM_COMPILER_IS_CLANG 1)
-endif()
-
-if(CMAKE_CXX_COMPILER_ID STREQUAL "PGI")
+if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" OR
+   CMAKE_CXX_SIMULATE_ID STREQUAL "MSVC")
+  set(VTKM_COMPILER_IS_MSVC 1)
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "PGI")
   set(VTKM_COMPILER_IS_PGI 1)
-endif()
-
-if(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
   set(VTKM_COMPILER_IS_ICC 1)
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
+  set(VTKM_COMPILER_IS_CLANG 1)
+  set(VTKM_COMPILER_IS_APPLECLANG 1)
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+  set(VTKM_COMPILER_IS_CLANG 1)
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+  set(VTKM_COMPILER_IS_GNU 1)
 endif()
 
-if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
-  set(VTKM_COMPILER_IS_MSVC 1)
-endif()
-
-
 #-----------------------------------------------------------------------------
 # vtkm_compiler_flags is used by all the vtkm targets and consumers of VTK-m
 # The flags on vtkm_compiler_flags are needed when using/building vtk-m
@@ -51,7 +42,7 @@ target_link_libraries(vtkm_compiler_flags
 target_compile_features(vtkm_compiler_flags INTERFACE cxx_std_11)
 
 # Enable large object support so we can have 2^32 addressable sections
-if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+if(VTKM_COMPILER_IS_MSVC)
   target_compile_options(vtkm_compiler_flags INTERFACE $<$<COMPILE_LANGUAGE:CXX>:/bigobj>)
   if(TARGET vtkm::cuda)
     target_compile_options(vtkm_compiler_flags INTERFACE $<$<COMPILE_LANGUAGE:CUDA>:-Xcompiler="/bigobj">)
@@ -72,11 +63,9 @@ add_library(vtkm_developer_flags INTERFACE)
 
 # Additional warnings just for Clang 3.5+, and AppleClang 7+
 # about failures to vectorize.
-if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
-    CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 3.4)
+if (VTKM_COMPILER_IS_CLANG AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 3.4)
   target_compile_options(vtkm_developer_flags INTERFACE $<$<COMPILE_LANGUAGE:CXX>:-Wno-pass-failed>)
-elseif(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" AND
-       CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.99)
+elseif(VTKM_COMPILER_IS_APPLECLANG AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.99)
   target_compile_options(vtkm_developer_flags INTERFACE $<$<COMPILE_LANGUAGE:CXX>:-Wno-pass-failed>)
 endif()