fix: support editable installs and Ninja in conda Windows builds

Find installed data next to a compiled module, since editable installs
keep Python files in the source tree. Clear the VS generator platform
and toolset in bld.bat, which Ninja rejects.

Assisted-by: ClaudeCode:claude-opus-5-5

Author: henryiii

conda-recipe-cf/bld.bat

@@ -20,6 +20,9 @@ set "CC=icx"
 set "CXX=icx"
 
 set "CMAKE_GENERATOR=Ninja"
+:: Set by the VS activation, but not supported by Ninja
+set "CMAKE_GENERATOR_PLATFORM="
+set "CMAKE_GENERATOR_TOOLSET="
 :: Make CMake verbose
 set "VERBOSE=1"
 

conda-recipe/bld.bat

@@ -18,6 +18,9 @@ set "CC=icx"
 set "CXX=icx"
 
 set "CMAKE_GENERATOR=Ninja"
+:: Set by the VS activation, but not supported by Ninja
+set "CMAKE_GENERATOR_PLATFORM="
+set "CMAKE_GENERATOR_TOOLSET="
 :: Make CMake verbose
 set "VERBOSE=1"
 

dpctl/__init__.py

@@ -148,7 +148,10 @@ def get_include():
     Extension modules that need to be compiled against dpctl should use
     this function to locate the appropriate include directory.
     """
-    return os.path.join(os.path.dirname(__file__), "include")
+    # Not __file__: editable installs keep Python files in the source tree
+    from . import _sycl_context
+
+    return os.path.join(os.path.dirname(_sycl_context.__file__), "include")
 
 
 del _init_helper

dpctl/__main__.py

@@ -24,7 +24,9 @@
 
 
 def _dpctl_dir() -> str:
-    dpctl_dir = importlib.util.find_spec("dpctl").submodule_search_locations[0]
+    # Compiled modules are next to the installed data, also in editable mode
+    origin = importlib.util.find_spec("dpctl._sycl_context").origin
+    dpctl_dir = os.path.dirname(origin)
     abs_dpctl_dir = os.path.abspath(dpctl_dir)
     return abs_dpctl_dir
 

dpctl/_init_helper.py

@@ -14,6 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import importlib.util
 import os
 import os.path
 import sys
@@ -24,7 +25,9 @@
 
 if sys.platform == "win32":  # pragma: no cover
     # Include folder containing DPCTLSyclInterface.dll to search path
-    os.add_dll_directory(os.path.dirname(__file__))
+    # Not __file__: editable installs keep Python files in the source tree
+    _origin = importlib.util.find_spec("dpctl._sycl_context").origin
+    os.add_dll_directory(os.path.dirname(_origin))
     if is_venv:
         # For virtual environments on Windows, add folder
         # with DPC++ libraries to the DLL search path gh-1745

dpctl/tests/test_service.py

@@ -156,7 +156,7 @@ def should_skip_syclinterface(request):
 
 
 def test_syclinterface(should_skip_syclinterface):
-    install_dir = os.path.dirname(os.path.abspath(dpctl.__file__))
+    install_dir = os.path.dirname(dpctl.get_include())
     paths = glob.glob(os.path.join(install_dir, "*DPCTLSyclInterface*"))
     if "linux" in sys.platform:
         if should_skip_syclinterface: