Catch RuntimeError from missing PCH symbols in old libnvrtc

When cuda.bindings is built against a newer toolkit but runs with an
older libnvrtc.so that lacks the PCH C symbols, the binding wrappers
exist (hasattr passes) but the actual call raises RuntimeError from
failing to resolve the function pointer at runtime.

Extract PCH status/retry logic into _pch_status_and_retry() and wrap
the call in try/except RuntimeError so we gracefully degrade to
pch_status=None instead of crashing.

Made-with: Cursor

Author: cpcloud

cuda_core/cuda/core/_program.pyx

@@ -797,8 +797,14 @@ cdef object Program_compile_nvrtc(Program self, str target_type, object name_exp
         self._pch_status = None
         return result
 
-    # PCH was requested — check creation status
-    cdef str status = _read_pch_status(prog)
+    try:
+        status = _read_pch_status(prog)
+    except RuntimeError as e:
+        raise RuntimeError(
+            "PCH was requested but the runtime libnvrtc does not support "
+            "PCH APIs. Update to CUDA toolkit 12.8 or newer."
+        ) from e
+
     if status is not None:
         self._pch_status = status
         return result