From 5d09ff452580c5a42b9a2b3a825e2827f2551003 Mon Sep 17 00:00:00 2001
From: "Bobby R. Bruce" <bbruce@ucdavis.edu>
Date: Mon, 18 Dec 2023 14:37:51 -0800
Subject: [PATCH] configs: Add `hasattr` guard to ensure DerivO3CPU compiled

configs/ruby/Ruby.py fails when `DerivO3CPU` is not compiled into the
gem5 binary. The `isinstance` check fails. This fix addds a guard.

Change-Id: I1e5503ab18ec94683056c6eb28cebeda6632ae8e
---
 configs/ruby/Ruby.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/configs/ruby/Ruby.py b/configs/ruby/Ruby.py
index d3f798ec3a..b84a69a80f 100644
--- a/configs/ruby/Ruby.py
+++ b/configs/ruby/Ruby.py
@@ -331,8 +331,9 @@ def send_evicts(options):
     # 2. The x86 mwait instruction is built on top of coherence invalidations
     # 3. The local exclusive monitor in ARM systems
 
-    if isinstance(options.cpu_type, DerivO3CPU) or ObjectList.cpu_list.get_isa(
-        options.cpu_type
-    ) in [ISA.X86, ISA.ARM]:
+    if (
+        hasattr(m5.objects, "DerivO3CPU")
+        and isinstance(options.cpu_type, DerivO3CPU)
+    ) or ObjectList.cpu_list.get_isa(options.cpu_type) in [ISA.X86, ISA.ARM]:
         return True
     return False