From: Patrick Palka <ppalka@redhat.com>
Date: Sat, 15 Jul 2023 13:47:36 +0000 (-0400)
Subject: c++: mangling template-id of unknown template [PR110524]
X-Git-Tag: basepoints/gcc-15~7601
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=97ceaa110e1607ec8f4f1223200868e1642f3cc7;p=thirdparty%2Fgcc.git

c++: mangling template-id of unknown template [PR110524]

This fixes a crash when mangling an ADL-enabled call to a template-id
naming an unknown template (as per P0846R0).

	PR c++/110524

gcc/cp/ChangeLog:

	* mangle.cc (write_expression): Handle TEMPLATE_ID_EXPR
	whose template is already an IDENTIFIER_NODE.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp2a/fn-template26.C: New test.
---

diff --git a/gcc/cp/mangle.cc b/gcc/cp/mangle.cc
index 7dab4e62bc9e..bef0fda6d229 100644
--- a/gcc/cp/mangle.cc
+++ b/gcc/cp/mangle.cc
@@ -3312,7 +3312,8 @@ write_expression (tree expr)
   else if (TREE_CODE (expr) == TEMPLATE_ID_EXPR)
     {
       tree fn = TREE_OPERAND (expr, 0);
-      fn = OVL_NAME (fn);
+      if (!identifier_p (fn))
+	fn = OVL_NAME (fn);
       if (IDENTIFIER_ANY_OP_P (fn))
 	write_string ("on");
       write_unqualified_id (fn);
diff --git a/gcc/testsuite/g++.dg/cpp2a/fn-template26.C b/gcc/testsuite/g++.dg/cpp2a/fn-template26.C
new file mode 100644
index 000000000000..d4a17eb9bd18
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/fn-template26.C
@@ -0,0 +1,16 @@
+// PR c++/110524
+// { dg-do compile { target c++20 } }
+
+template<class T>
+auto f(T t) -> decltype(g<T>(t));
+
+namespace N {
+  struct A { };
+  template<class T> void g(T);
+};
+
+int main() {
+  f(N::A{});
+}
+
+// { dg-final { scan-assembler "_Z1fIN1N1AEEDTcl1gIT_Efp_EES2_" } }