Fixing windows CI

Signed-off-by: Aleksandr Motsjonov <soswow@gmail.com>

Author: soswow

src/python-nanobind/__init__.py

@@ -14,6 +14,14 @@
         os.environ["OpenImageIO_ROOT"] = _here
 
 if platform.system() == "Windows":
+    # MSVC multi-config builds often put _OpenImageIO*.pyd under OpenImageIO/<Config>/
+    # while this __init__.py lives in OpenImageIO/. Extend the package search path
+    # so `from . import _OpenImageIO` resolves (no CMake per-config output juggling).
+    for _cfg in ("Release", "Debug", "RelWithDebInfo", "MinSizeRel"):
+        _subdir = os.path.join(_here, _cfg)
+        if os.path.isdir(_subdir) and _subdir not in __path__:
+            __path__.append(_subdir)
+
     _bin_dir = os.path.join(_here, "bin")
     if os.path.exists(_bin_dir):
         os.add_dll_directory(_bin_dir)
@@ -23,7 +31,36 @@
                 if os.path.exists(path) and path != ".":
                     os.add_dll_directory(path)
 
-from . import _OpenImageIO as _ext  # noqa: E402
+try:
+    from . import _OpenImageIO as _ext  # noqa: E402
+except ImportError as _import_err:
+    # TODO Debugging to be removed before merge
+    try:
+        _nb_paths = list(__path__)
+    except NameError:
+        _nb_paths = []
+    _nb_cfg_dirs = {}
+    for _cfg in ("Release", "Debug", "RelWithDebInfo", "MinSizeRel"):
+        _p = os.path.join(_here, _cfg)
+        if os.path.isdir(_p):
+            try:
+                _nb_cfg_dirs[_cfg] = os.listdir(_p)
+            except OSError as _oe:
+                _nb_cfg_dirs[_cfg] = "<OSError: %s>" % (_oe,)
+    print(
+        "[OpenImageIO nanobind] import _OpenImageIO failed: %s\n  __file__=%r\n  _here=%r\n"
+        "  __path__=%r\n  listdir(_here)=%r\n  listdir per-config subdirs=%r"
+        % (
+            _import_err,
+            __file__,
+            _here,
+            _nb_paths,
+            os.listdir(_here) if os.path.isdir(_here) else None,
+            _nb_cfg_dirs,
+        ),
+        file=sys.stderr,
+    )
+    raise
 from ._OpenImageIO import *  # type: ignore # noqa: E402, F401, F403
 
 __doc__ = """