Rework Linker dispatching for cross-major nvJitLink/driver skew

cuda_core/cuda/core/_linker.pxd

@@ -2,15 +2,27 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
+from libcpp.vector cimport vector
+
+from cuda.bindings cimport cydriver
+
 from ._resource_handles cimport NvJitLinkHandle, CuLinkHandle
 
 
 cdef class Linker:
     cdef:
         NvJitLinkHandle _nvjitlink_handle
         CuLinkHandle _culink_handle
+        # _drv_jit_keys/_drv_jit_values are the C arrays handed to cuLinkCreate.
+        # The driver retains a reference to the optionValues array for the life
+        # of the CUlinkState (it writes back log-size outputs into its slots),
+        # so these must live past cuLinkCreate and outlive cuLinkDestroy.
+        # Declared after _culink_handle so their C++ destructors run AFTER
+        # cuLinkDestroy executes during tp_dealloc.
+        vector[cydriver.CUjit_option] _drv_jit_keys
+        vector[void*] _drv_jit_values
         bint _use_nvjitlink
-        object _drv_log_bufs  # formatted_options list (driver); None for nvjitlink; cleared in link()
+        object _drv_log_bufs  # formatted_options list (driver); None for nvjitlink
         str _info_log         # decoded log; None until link() or pre-link get_*_log()
         str _error_log        # decoded log; None until link() or pre-link get_*_log()
         object _options       # LinkerOptions