diff --git a/src/V3EmitCModel.cpp b/src/V3EmitCModel.cpp
index 2ceeafbde..25a7368c0 100644
--- a/src/V3EmitCModel.cpp
+++ b/src/V3EmitCModel.cpp
@@ -197,9 +197,11 @@ class EmitCModel final : public EmitCFunc {
         puts("/// Returns time at next time slot. Aborts if !eventsPending()\n");
         puts("uint64_t nextTimeSlot();\n");
 
-        puts("/// Trace signals in the model; called by application code\n");
-        puts("void trace(" + v3Global.opt.traceClassBase()
-             + "C* tfp, int levels, int options = 0);\n");
+        if (v3Global.opt.trace() || !optSystemC()) {
+            puts("/// Trace signals in the model; called by application code\n");
+            puts("void trace(" + v3Global.opt.traceClassBase()
+                 + "C* tfp, int levels, int options = 0);\n");
+        }
         if (v3Global.opt.trace() && optSystemC()) {
             puts("/// SC tracing; avoid overloaded virtual function lint warning\n");
             puts("void trace(sc_trace_file* tfp) const override { "
diff --git a/test_regress/driver.pl b/test_regress/driver.pl
index 69c8cccb4..05b4c2ed9 100755
--- a/test_regress/driver.pl
+++ b/test_regress/driver.pl
@@ -2245,6 +2245,7 @@ sub files_identical {
                 $l1[$l] =~ s/CPU Time: +[0-9.]+ seconds[^\n]+/CPU Time: ###/mig;
                 $l1[$l] =~ s/\?v=[0-9.]+/?v=latest/mig;  # warning URL
                 $l1[$l] =~ s/_h[0-9a-f]{8}_/_h########_/mg;
+                $l1[$l] =~ s!%Error: \./!%Error: !mg; # clang gives ./ while GCC does not
                 $l1[$l] =~ s/ \/[^ ]+\/verilated_std.sv/ verilated_std.sv/mg;
                 if ($l1[$l] =~ s/Exiting due to.*/Exiting due to/mig) {
                     splice @l1, $l+1;  # Trunc rest