When compiling a very simple program with Clang++, vanilla version 16 (not intel version), I get warnings that do not arise when compiling with the dpcpp compiler. I am concerned since I have no way to know if the warnings will mean that my code will be malfunctioning in some way at runtime.
This minimal code generates some warnings about interop_handler being deprecated:
#include <CL/sycl.hpp>
int main(){}
The command issued is the following, where INCLUDEDIR is used to indicate where the SYCL headers are:
clang++ -std=c++17 -I$INCLUDEDIR -c t.cpp
The warnings are:
In file included from t.cpp:1:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl.hpp:16:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/backend.hpp:18:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/backend_traits_opencl.hpp:26:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/queue.hpp:20:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/handler.hpp:14:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/cg.hpp:27:
/ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/cg_types.hpp:234:32: warning: 'interop_handler' is deprecated: interop_handler class is deprecated, use interop_handle instead with host-task [-Wdeprecated-declarations]
std::function<void(cl::sycl::interop_handler)> MFunc;
^
/ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/interop_handler.hpp:18:7: note: 'interop_handler' has been explicitly marked deprecated here
class __SYCL_DEPRECATED("interop_handler class is deprecated, use"
^
/ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/defines_elementary.hpp:45:38: note: expanded from macro '__SYCL_DEPRECATED'
#define __SYCL_DEPRECATED(message) [[deprecated(message)]]
^
In file included from t.cpp:1:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl.hpp:16:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/backend.hpp:18:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/backend_traits_opencl.hpp:26:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/queue.hpp:20:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/handler.hpp:14:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/cg.hpp:27:
/ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/cg_types.hpp:237:44: warning: 'interop_handler' is deprecated: interop_handler class is deprecated, use interop_handle instead with host-task [-Wdeprecated-declarations]
InteropTask(std::function<void(cl::sycl::interop_handler)> Func)
^
/ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/interop_handler.hpp:18:7: note: 'interop_handler' has been explicitly marked deprecated here
class __SYCL_DEPRECATED("interop_handler class is deprecated, use"
^
/ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/defines_elementary.hpp:45:38: note: expanded from macro '__SYCL_DEPRECATED'
#define __SYCL_DEPRECATED(message) [[deprecated(message)]]
^
In file included from t.cpp:1:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl.hpp:16:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/backend.hpp:18:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/backend_traits_opencl.hpp:26:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/queue.hpp:20:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/handler.hpp:14:
In file included from /ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/cg.hpp:27:
/ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/cg_types.hpp:239:23: warning: 'interop_handler' is deprecated: interop_handler class is deprecated, use interop_handle instead with host-task [-Wdeprecated-declarations]
void call(cl::sycl::interop_handler &h) { MFunc(h); }
^
/ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/interop_handler.hpp:18:7: note: 'interop_handler' has been explicitly marked deprecated here
class __SYCL_DEPRECATED("interop_handler class is deprecated, use"
^
/ONE_API_2022.3/compiler/2022.2.0/linux/include/sycl/CL/sycl/detail/defines_elementary.hpp:45:38: note: expanded from macro '__SYCL_DEPRECATED'
#define __SYCL_DEPRECATED(message) [[deprecated(message)]]
^
3 warnings generated.
As said, this happens with a minimal example; with more complicated SYCL code there would be more warnings. I want to know if I should be concerned and if there is some way to solve the warnings.
Intel's SYCL implementation spews warnings like there is no tomorrow due to extreme overuse of deprecation annotations. Just add -Wno-deprecated-declarations
which is supported by both clang++ and g++.