Exception was removed from empty cg

Signed-off-by: mdimakov <[email protected]>

Author: maximdimakov

sycl/include/CL/sycl/handler.hpp

@@ -40,18 +40,6 @@
 #define __SYCL_NONCONST_FUNCTOR__
 #endif
 
-#if SYCL_LANGUAGE_VERSION
-#define __SYCL_STD_VERSION__ SYCL_LANGUAGE_VERSION
-#else
-#define __SYCL_STD_VERSION__ 201707
-#endif
-
-enum Sycl_std_versions {
-  version_older_2020,
-  version_2020
-};
-extern Sycl_std_versions sycl_ver;
-
 template <typename DataT, int Dimensions, cl::sycl::access::mode AccessMode,
           cl::sycl::access::target AccessTarget,
           cl::sycl::access::placeholder IsPlaceholder>

sycl/source/handler.cpp

@@ -20,8 +20,6 @@
 #include <detail/queue_impl.hpp>
 #include <detail/scheduler/scheduler.hpp>
 
-Sycl_std_versions sycl_ver;
-
 __SYCL_INLINE_NAMESPACE(cl) {
 namespace sycl {
 
@@ -204,10 +202,10 @@ event handler::finalize() {
         std::move(MRequirements), std::move(MEvents), MCGType, MCodeLoc));
     break;
   case detail::CG::NONE:
-    if (sycl_ver == version_older_2020) 
-      throw runtime_error("Command group submitted without a kernel or a "
-                        "explicit memory operation.",
-                        PI_INVALID_OPERATION);
+    if (detail::pi::trace(detail::pi::TraceLevel::PI_TRACE_ALL)) {
+      std::cout << "The empty command group is supported by sycl2020"
+                << std::endl;
+    }
     break;
   }
 
@@ -219,7 +217,7 @@ event handler::finalize() {
         "Internal Error. Command group cannot be constructed.",
         PI_INVALID_OPERATION);
     else
-      // if no runtime error was throws it is empty cg from sycl2020
+      // empty cg is supported by sycl2020
       Event = std::make_shared<cl::sycl::detail::event_impl>();
   }
   else