From f521a9756372a8a5705e33b5cc7d2965b82681ac Mon Sep 17 00:00:00 2001
From: ianchb <i@4t.pw>
Date: Sat, 25 Apr 2026 09:39:49 +0800
Subject: [PATCH] Fix ABE CPU version build error

---
 AMSS_NCKU_source/bssn_class.C | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/AMSS_NCKU_source/bssn_class.C b/AMSS_NCKU_source/bssn_class.C
index 4b9cc65..c1bcdf1 100644
--- a/AMSS_NCKU_source/bssn_class.C
+++ b/AMSS_NCKU_source/bssn_class.C
@@ -540,6 +540,18 @@ void bssn_cuda_sync_level_bh_fields(MyList<Patch> *PatL,
 } // namespace
 #endif
 
+#if !USE_CUDA_BSSN
+namespace {
+
+bool bssn_constraint_recompute_from_state(int lev, bool level0_cache_valid)
+{
+  (void)level0_cache_valid;
+  return lev > 0;
+}
+
+} // namespace
+#endif
+
 //================================================================================================
 
 // define bssn_class