ENH: Deduce CudaCommon_VERSION_MAJOR from its CMake existence

CMakeLists.txt

@@ -234,7 +234,7 @@ else()
 endif()
 
 # Propagate cmake options in a header file
-# Must be done after the external module configuration to make sure CudaCommon_SOURCE_DIR is defined
+# Must be done after the external module configuration to make sure CudaCommon_VERSION is defined
 configure_file(${RTK_SOURCE_DIR}/rtkConfiguration.h.in
   ${RTK_BINARY_DIR}/rtkConfiguration.h)
 

rtkConfiguration.h.in

@@ -35,9 +35,10 @@ using ThreadIdType = itk::ThreadIdType;
 #  define SLAB_SIZE @RTK_CUDA_PROJECTIONS_SLAB_SIZE@
 #endif
 
-// CudaCommon_SOURCE_DIR and cudaCommonConfiguration.h were introduced in CudaCommon 2.0
-#cmakedefine CudaCommon_SOURCE_DIR
-#ifdef CudaCommon_SOURCE_DIR
+// CudaCommon_VERSION_* and cudaCommonConfiguration.h were introduced in CudaCommon 2.0
+#cmakedefine CudaCommon_VERSION_MAJOR
+#ifdef CudaCommon_VERSION_MAJOR
+#  undef CudaCommon_VERSION_MAJOR
 #  include <cudaCommonConfiguration.h>
 #endif
 

wrapping/itkCudaImageRTK.wrap

@@ -1,11 +1,11 @@
 if(RTK_USE_CUDA)
 
-  if(CudaCommon_SOURCE_DIR)
+  if(CudaCommon_VERSION_MAJOR)
     configure_file("${CudaCommon_SOURCE_DIR}/wrapping/CudaImage.i.init" "${CMAKE_CURRENT_BINARY_DIR}/CudaImageRTK.i" @ONLY)
   endif()
 
   function(wrap_CudaImage_swig_ext type px_type)
-    if(CudaCommon_SOURCE_DIR)
+    if(CudaCommon_VERSION_MAJOR)
       set(CudaImageTypes ${type})
       set(PixelType ${px_type})
       configure_file(${CudaCommon_SOURCE_DIR}/wrapping/CudaImage.i.in ${CMAKE_CURRENT_BINARY_DIR}/CudaImageRTK.i.temp @ONLY)
@@ -43,7 +43,7 @@ if(RTK_USE_CUDA)
 
   itk_end_wrap_class()
 
-  if(CudaCommon_SOURCE_DIR)
+  if(CudaCommon_VERSION_MAJOR)
     # Add library files to be included at a submodule level and copy them into
     # ITK's wrapping typedef directory.
     # Another approach is to add CudaImage.i to the WRAPPER_SWIG_LIBRARY_FILES list