From 89fcc20570410d1154ee1b9cbaf85c887760b062 Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Sat, 18 Jun 2022 17:05:05 +0200
Subject: [PATCH] Make error message more verbose: State explicitely when
 transient op has failed.

---
 src/spicelib/analysis/cktop.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/spicelib/analysis/cktop.c b/src/spicelib/analysis/cktop.c
index 51588ffec..07788f386 100644
--- a/src/spicelib/analysis/cktop.c
+++ b/src/spicelib/analysis/cktop.c
@@ -91,7 +91,12 @@ CKTop (CKTcircuit *ckt, long int firstmode, long int continuemode,
 
     /* If command 'optran' is not given, the function
        returns immediately with the previous 'converged' */
+    int prevconverged = converged;
     converged = OPtran(ckt, converged);
+    if (converged == 106)
+        fprintf(cp_err, "Error: Transient op failed, timestep too small\n\n");
+    else if (converged != prevconverged)
+        fprintf(cp_err, "Error: Transient op failed, cause unrecorded\n\n");
 
 #ifdef XSPICE
     /* gtri - wbk - add convergence problem reporting flags */