From cc74390799635f3135095d722af048ac0e384ed5 Mon Sep 17 00:00:00 2001
From: Iain Buclaw <ibuclaw@gdcproject.org>
Date: Mon, 24 Nov 2025 14:27:14 +0100
Subject: [PATCH] C++: Add dmd::printInstantiationTrace to compiler interface

---
 compiler/src/dmd/cxxfrontend.d    | 5 +++++
 compiler/src/dmd/template.h       | 1 +
 compiler/src/tests/cxxfrontend.cc | 1 +
 3 files changed, 7 insertions(+)

diff --git a/compiler/src/dmd/cxxfrontend.d b/compiler/src/dmd/cxxfrontend.d
index 004bc3fcb626..048bc2d612c6 100644
--- a/compiler/src/dmd/cxxfrontend.d
+++ b/compiler/src/dmd/cxxfrontend.d
@@ -354,6 +354,11 @@ void printTemplateStats(bool listInstances, ErrorSink eSink)
     return dmd.dtemplate.printTemplateStats(listInstances, eSink);
 }
 
+void printInstantiationTrace(TemplateInstance ti)
+{
+    return ti.printInstantiationTrace();
+}
+
 /***********************************************************
  * dtoh.d
  */
diff --git a/compiler/src/dmd/template.h b/compiler/src/dmd/template.h
index f0fba2b8d16c..c38a630d7c9b 100644
--- a/compiler/src/dmd/template.h
+++ b/compiler/src/dmd/template.h
@@ -293,5 +293,6 @@ namespace dmd
     TemplateParameter *isTemplateParameter(RootObject *o);
     bool isError(const RootObject *const o);
     void printTemplateStats(bool listInstances, ErrorSink* eSink);
+    void printInstantiationTrace(TemplateInstance *ti);
     bool declareParameter(TemplateParameter *tp, Scope *sc);
 }
diff --git a/compiler/src/tests/cxxfrontend.cc b/compiler/src/tests/cxxfrontend.cc
index b1020e2423dc..54ecb933bcd0 100644
--- a/compiler/src/tests/cxxfrontend.cc
+++ b/compiler/src/tests/cxxfrontend.cc
@@ -1869,6 +1869,7 @@ void template_h(TemplateParameter *tp, Scope *sc, TemplateParameters *tps,
     dmd::isTemplateParameter(o);
     dmd::isError(o);
     dmd::printTemplateStats(true, sink);
+    dmd::printInstantiationTrace (sc->tinst);
 }
 
 void typinf_h(Expression *e, Loc loc, Type *t, Scope *sc)