Use khr_default_context() per DPC++ compiler deprecation warning

Author: antonwolfy

docs/doc_sources/user_guides/dlpack.rst

@@ -46,8 +46,8 @@ When sharing USM allocation (of any ``sycl::usm::kind``) with ``void * ptr`` bou
     // Keep in mind, the device may be a sub-device
     const sycl::device &ptr_dev = sycl::get_pointer_device(ptr, ctx);
 
-    #if SYCL_EXT_ONEAPI_DEFAULT_CONTEXT
-    const sycl::context &default_ctx = ptr_dev.get_platform().ext_oneapi_get_default_context();
+    #if SYCL_KHR_DEFAULT_CONTEXT
+    const sycl::context &default_ctx = ptr_dev.get_platform().khr_get_default_context();
     #else
     static_assert(false, "ext_oneapi_default_context extension is required");
     #endif
@@ -106,8 +106,8 @@ Importing DLPack with ``device_type == kDLOneAPI``
     // );
 
     // Get default platform context
-    #if SYCL_EXT_ONEAPI_DEFAULT_CONTEXT
-    const sycl::context &default_ctx = root_device.get_platform().ext_oneapi_get_default_context();
+    #if SYCL_KHR_DEFAULT_CONTEXT
+    const sycl::context &default_ctx = root_device.get_platform().khr_get_default_context();
     #else
     static_assert(false, "ext_oneapi_default_context extension is required");
     #endif

libsyclinterface/source/dpctl_sycl_platform_interface.cpp

@@ -227,17 +227,24 @@ DPCTLPlatform_GetDefaultContext(__dpctl_keep const DPCTLSyclPlatformRef PRef)
 {
     auto P = unwrap<platform>(PRef);
     if (P) {
-#ifdef SYCL_EXT_ONEAPI_DEFAULT_CONTEXT
+#if defined(SYCL_KHR_DEFAULT_CONTEXT) ||                                       \
+    defined(SYCL_EXT_ONEAPI_DEFAULT_CONTEXT)
         try {
-            const auto &default_ctx = P->ext_oneapi_get_default_context();
+            const auto &default_ctx = P->
+#ifdef SYCL_KHR_DEFAULT_CONTEXT
+                                      khr_get_default_context()
+#else
+                                      ext_oneapi_get_default_context()
+#endif // SYCL_KHR_DEFAULT_CONTEXT
+                ;
             return wrap<context>(new context(default_ctx));
         } catch (const std::exception &ex) {
             error_handler(ex, __FILE__, __func__, __LINE__);
             return nullptr;
         }
 #else
         return nullptr;
-#endif
+#endif // SYCL_KHR_DEFAULT_CONTEXT || SYCL_EXT_ONEAPI_DEFAULT_CONTEXT
     }
     else {
         error_handler(