fix(cuda.bindings): make cythonization warning-clean and enable -Werror (#2463)

* fix(cuda.bindings): make cythonization warning-clean and enable -Werror

Clear the Cython warnings that blocked matching cuda.core's warning_errors
setting (#2450): drop ignored except clauses on Python-returning cudla
cpdefs, declare LOAD_LIBRARY_SEARCH_SYSTEM32 as const in windll.pxd, and
enable Cython Options.warning_errors in build_hooks.

Add source-level regression tests so these patterns do not return.

Signed-off-by: Omar Atie <atiaomar1978-hub@users.noreply.github.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

* style: ruff-format cython warning cleanliness tests

Signed-off-by: Omar Atie <atiaomar1978-hub@users.noreply.github.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

* test(cuda.bindings): drop cython warning cleanliness tests

Address review feedback: warning_errors in build_hooks already
guards against Cython warning regressions, so the source-level
tests add unnecessary maintenance cost.

Signed-off-by: Omar Atie <atiaomar1978-hub@users.noreply.github.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Signed-off-by: Omar Atie <atiaomar1978-hub@users.noreply.github.com>
Co-authored-by: Omar Atie <atiaomar1978-hub@users.noreply.github.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: atiaomar1978-hub

cuda_bindings/build_hooks.py

@@ -137,6 +137,7 @@ def _build_cuda_bindings(debug=False):
     that metadata queries do not require a CUDA toolkit installation.
     """
     from Cython.Build import cythonize
+    from Cython.Compiler import Options as _CythonOptions
 
     global _extensions
 
@@ -230,6 +231,7 @@ def get_static_libraries(f):
         )
 
     # Cythonize
+    _CythonOptions.warning_errors = True
     cython_directives = {"language_level": 3, "embedsignature": True, "binding": True, "freethreading_compatible": True}
     if compile_for_coverage:
         cython_directives["linetrace"] = True

cuda_bindings/cuda/bindings/_lib/windll.pxd

@@ -14,7 +14,7 @@ cdef extern from "windows.h" nogil:
     ctypedef const char *LPCSTR
     ctypedef int BOOL
 
-    cdef DWORD LOAD_LIBRARY_SEARCH_SYSTEM32 = 0x00000800
+    const DWORD LOAD_LIBRARY_SEARCH_SYSTEM32
 
     HMODULE _LoadLibraryExW "LoadLibraryExW"(
         LPCWSTR lpLibFileName,