Fix kernel inclusion problems in Py installations

Author: Ruochun

CMakeLists.txt

@@ -26,6 +26,9 @@ if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "RelWithDebInfo" "MinSizeRel")
 endif()
 
+# Mark compile time (not runtime), affects how some kernel files include
+add_compile_definitions(DEME_BEING_CMAKE_COMPILED)
+
 # ---------------------------------------------------------------------------- #
 # Additional Packages
 # ---------------------------------------------------------------------------- #

src/algorithms/CMakeLists.txt

@@ -7,8 +7,6 @@ message(STATUS "==== Configuring GPU Algorithm Components ====")
 
 set (algorithms_message "[algorithms]")
 
-
-
 add_library(algorithms OBJECT)
 
 target_include_directories(

src/kernel/DEMHelperKernels.cuh

@@ -4,7 +4,14 @@
 #define DEME_HELPER_KERNELS_CU
 
 #include <DEM/Defines.h>
-#include <kernel/CUDAMathHelpers.cuh>
+
+// CUDAMathHelpers.cuh is used in static compilation, and that needs to be found through src then kernel. But at
+// runtime, we ask jitify to find include files only at same level of all other fellow kernel files.
+#ifdef DEME_BEING_CMAKE_COMPILED
+    #include <kernel/CUDAMathHelpers.cuh>
+#else
+    #include <CUDAMathHelpers.cuh>
+#endif
 
 // inline __device__ voxelID_t position2VoxelID