From 693beb6de8046ce332fa67cbdf0fa73e84f53885 Mon Sep 17 00:00:00 2001
From: Ingmar Schoegl <ischoegl@lsu.edu>
Date: Sat, 12 Aug 2023 07:34:04 -0500
Subject: [PATCH] [kinetics] Track undeclared third body usage

---
 include/cantera/kinetics/Kinetics.h | 3 +++
 src/kinetics/BulkKinetics.cpp       | 2 ++
 src/kinetics/Kinetics.cpp           | 3 +++
 3 files changed, 8 insertions(+)

diff --git a/include/cantera/kinetics/Kinetics.h b/include/cantera/kinetics/Kinetics.h
index 9d8af48d1..6c62c4640 100644
--- a/include/cantera/kinetics/Kinetics.h
+++ b/include/cantera/kinetics/Kinetics.h
@@ -1625,6 +1625,9 @@ protected:
     //! See skipUndeclaredThirdBodies()
     bool m_skipUndeclaredThirdBodies = false;
 
+    //! Flag indicating whether reactions include undeclared third bodies
+    bool m_hasUndeclaredThirdBodies = false;
+
     //! reference to Solution
     std::weak_ptr<Solution> m_root;
 };
diff --git a/src/kinetics/BulkKinetics.cpp b/src/kinetics/BulkKinetics.cpp
index f35119164..dfa8052de 100644
--- a/src/kinetics/BulkKinetics.cpp
+++ b/src/kinetics/BulkKinetics.cpp
@@ -88,6 +88,8 @@ void BulkKinetics::addThirdBody(shared_ptr<Reaction> r)
             throw CanteraError("BulkKinetics::addThirdBody", "Found third-body"
                 " efficiency for undefined species '{}' while adding reaction '{}'",
                 name, r->equation());
+        } else {
+            m_hasUndeclaredThirdBodies = true;
         }
     }
     m_multi_concm.install(nReactions() - 1, efficiencies,
diff --git a/src/kinetics/Kinetics.cpp b/src/kinetics/Kinetics.cpp
index 5710d69e3..4031a705a 100644
--- a/src/kinetics/Kinetics.cpp
+++ b/src/kinetics/Kinetics.cpp
@@ -643,6 +643,9 @@ AnyMap Kinetics::parameters()
         if (nReactions() == 0) {
             out["reactions"] = "none";
         }
+        if (m_hasUndeclaredThirdBodies) {
+            out["skip-undeclared-third-bodies"] = true;
+        }
     }
     return out;
 }