Add sycl header compatibility file, borrowed from Umpire.

Author: rhornung67

include/RAJA/policy/sycl.hpp

@@ -24,7 +24,7 @@
 
 #if defined(RAJA_SYCL_ACTIVE)
 
-#include <CL/sycl.hpp>
+#include "RAJA/util/sycl_compat.hpp"
 
 #include "RAJA/policy/sycl/forall.hpp"
 #include "RAJA/policy/sycl/policy.hpp"

include/RAJA/policy/sycl/MemUtils_SYCL.hpp

@@ -23,7 +23,7 @@
 
 #if defined(RAJA_ENABLE_SYCL)
 
-#include <sycl/sycl.hpp>
+#include "RAJA/util/sycl_compat.hpp"
 
 #include <cassert>
 #include <cstddef>

include/RAJA/policy/sycl/forall.hpp

@@ -26,10 +26,11 @@
 
 #if defined(RAJA_ENABLE_SYCL)
 
-#include <sycl/sycl.hpp>
 #include <algorithm>
 #include <chrono>
 
+#include "RAJA/util/sycl_compat.hpp"
+
 #include "RAJA/pattern/forall.hpp"
 
 #include "RAJA/pattern/params/forall.hpp"

include/RAJA/policy/sycl/policy.hpp

@@ -22,7 +22,7 @@
 
 #if defined(RAJA_SYCL_ACTIVE)
 
-#include <sycl/sycl.hpp>
+#include "RAJA/util/sycl_compat.hpp"
 
 #include "RAJA/policy/PolicyBase.hpp"
 #include "RAJA/policy/sequential/policy.hpp"

include/RAJA/util/sycl_compat.hpp

@@ -0,0 +1,7 @@
+#if (__INTEL_CLANG_COMPILER && __INTEL_CLANG_COMPILER < 20230000)
+// older version, use legacy header locations
+#include <CL/sycl.hpp>
+#else
+// SYCL 2020 standard header
+#include <sycl/sycl.hpp>
+#endif