fix default values

Author: ndgrigorian

dpctl/program/_program.pyx

@@ -671,20 +671,21 @@ cpdef create_kernel_bundle_from_sycl_source(SyclQueue q,
                 :class:`.SyclKernelBundle` is going to be built.
             source (unicode)
                 SYCL source code string.
-            headers (list)
+            headers (list, optional)
                 Optional list of virtual headers, where each entry in the list
                 needs to be a tuple of header name and header content. See the
                 documentation of the ``include_files`` property in the DPC++
                 ``kernel_compiler`` extension for more information.
-                Default: []
+                Default: ``None``
             registered_names (list, optional)
                 Optional list of kernel names to register. See the
                 documentation of the ``registered_names`` property in the DPC++
                 ``kernel_compiler`` extension for more information.
-                Default: []
-            copts (list)
+                Default: ``None``
+            copts (list, optional)
                 Optional list of compilation flags that will be used
-                when compiling the program. Default: ``""``.
+                when compiling the program.
+                Default: ``None``
 
         Returns:
             kernel_bundle (:class:`.SyclKernelBundle`)
@@ -710,6 +711,14 @@ cpdef create_kernel_bundle_from_sycl_source(SyclQueue q,
     cdef bytes bContent
     cdef const char* sContent
     cdef const char* buildLogContent
+
+    if headers is None:
+        headers = []
+    if registered_names is None:
+        registered_names = []
+    if copts is None:
+        copts = []
+
     for opt in copts:
         if not isinstance(opt, unicode):
             DPCTLBuildOptionList_Delete(BuildOpts)

dpctl/tests/test_sycl_program.py

@@ -570,6 +570,34 @@ def test_sycl_source_compilation_is_available_returns_bool():
     assert type(v) is bool
 
 
+@pytest.mark.parametrize(
+    "queue_selector", [_get_opencl_queue_or_skip, _get_level_zero_queue_or_skip]
+)
+def test_create_kernel_bundle_from_sycl_source_defaults(queue_selector):
+    q = queue_selector()
+    _skip_if_no_sycl_source_compilation(q)
+
+    sycl_source = """
+    #include <sycl/sycl.hpp>
+
+    namespace syclext = sycl::ext::oneapi::experimental;
+
+    extern "C" SYCL_EXTERNAL
+    SYCL_EXT_ONEAPI_FUNCTION_PROPERTY((syclext::nd_range_kernel<1>))
+    void vector_add(int* in1, int* in2, int* out){
+        sycl::nd_item<1> item =
+                        sycl::ext::oneapi::this_work_item::get_nd_item<1>();
+        size_t globalID = item.get_global_linear_id();
+        out[globalID] = in1[globalID] + in2[globalID];
+    }
+    """
+
+    prog = dpctl.program.create_kernel_bundle_from_sycl_source(q, sycl_source)
+
+    assert type(prog) is dpctl_prog.SyclKernelBundle
+    assert prog.has_sycl_kernel("vector_add")
+
+
 @pytest.mark.parametrize(
     "queue_selector", [_get_opencl_queue_or_skip, _get_level_zero_queue_or_skip]
 )