Stop CMake from marking cudf's libcudacxx and thrust includes as syst…

…em (#9277)

* Stop CMake from marking cudf's libcudacxx and thrust includes as system

nvcc automatically adds the CUDA Toolkit system include paths before any
system include paths that CMake adds.

CMake implicitly treats all includes on import targets as 'SYSTEM' includes.

To get the cudacxx shipped with cudf to be picked up by consumers instead of the
version shipped with the CUDA Toolkit we need to make sure it is a non-SYSTEM
include on the CMake side.

* Clarify comment

cpp/CMakeLists.txt

@@ -473,8 +473,7 @@ target_include_directories(cudf
                        "$<BUILD_INTERFACE:${CUDF_GENERATED_INCLUDE_DIR}/include>"
            PRIVATE     "$<BUILD_INTERFACE:${CUDF_SOURCE_DIR}/src>"
            INTERFACE   "$<INSTALL_INTERFACE:include>"
-                       "$<INSTALL_INTERFACE:include/libcudf/libcudacxx>"
-                       "$<INSTALL_INTERFACE:include/libcudf/Thrust>")
+                       "$<INSTALL_INTERFACE:include/libcudf/libcudacxx>")
 
 target_compile_definitions(cudf
             PUBLIC "$<$<COMPILE_LANGUAGE:CXX>:${CUDF_CXX_DEFINITIONS}>"
@@ -511,7 +510,7 @@ target_link_libraries(cudf
                   cudf::Thrust
                   rmm::rmm
            PRIVATE cuco::cuco
-	             ZLIB::ZLIB
+                   ZLIB::ZLIB
                    nvcomp::nvcomp)
 
 # Add Conda library, and include paths if specified
@@ -692,6 +691,40 @@ following IMPORTED GLOBAL  targets:
     ]=])
 
 
+set(common_code_string
+    [=[
+if(NOT TARGET cudf::Thrust)
+  thrust_create_target(cudf::Thrust FROM_OPTIONS)
+endif()
+
+# nvcc automatically adds the CUDA Toolkit system include paths before any
+# system include paths that CMake adds.
+#
+# CMake implicitly treats all includes on import targets as 'SYSTEM' includes.
+#
+# To get the cudacxx shipped with cudf to be picked up by consumers instead of the
+# version shipped with the CUDA Toolkit we need to make sure it is a non-SYSTEM
+# include on the CMake side.
+#
+# To do this currently, we move the includes from the cudf::cudf target to a
+# non-import target to ensure they are `-I` instead of `-isystem`
+
+add_library(cudf_non_system_includes INTERFACE)
+target_link_libraries(cudf::cudf INTERFACE cudf_non_system_includes)
+
+get_target_property(all_includes cudf::cudf INTERFACE_INCLUDE_DIRECTORIES)
+set(system_includes )
+set(normal_includes )
+foreach(include IN LISTS all_includes)
+  if(include MATCHES "/include/libcudf/")
+    list(APPEND normal_includes "${include}")
+  else()
+    list(APPEND system_includes "${include}")
+  endif()
+endforeach()
+set_target_properties(cudf::cudf PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${system_includes}")
+set_target_properties(cudf_non_system_includes PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${normal_includes}")
+]=])
 set(install_code_string
     [=[
 set(ArrowCUDA_DIR "${Arrow_DIR}")
@@ -705,11 +738,8 @@ if(testing IN_LIST cudf_FIND_COMPONENTS)
     include("${CMAKE_CURRENT_LIST_DIR}/cudf-testing-targets.cmake")
   endif()
 endif()
-
-if(NOT TARGET cudf::Thrust)
-  thrust_create_target(cudf::Thrust FROM_OPTIONS)
-endif()
 ]=])
+string(APPEND install_code_string "${common_code_string}")
 
 rapids_export(INSTALL cudf
     EXPORT_SET cudf-exports
@@ -728,11 +758,8 @@ endif()
 if(EXISTS "${CMAKE_CURRENT_LIST_DIR}/cudf-testing-targets.cmake")
   include("${CMAKE_CURRENT_LIST_DIR}/cudf-testing-targets.cmake")
 endif()
-
-if(NOT TARGET cudf::Thrust)
-  thrust_create_target(cudf::Thrust FROM_OPTIONS)
-endif()
 ]=])
+string(APPEND build_code_string "${common_code_string}")
 
 rapids_export(BUILD cudf
     EXPORT_SET cudf-exports