[pushed] c++: auto member function and auto variable [PR106893]

[pushed] c++: auto member function and auto variable [PR106893]

[Jason Merrill]

As with PR105623, we need to call mark_single_function sooner to
resolve the type of a BASELINK.

Tested x86_64-pc-linux-gnu, applying to trunk.

	PR c++/106893
	PR c++/90451

gcc/cp/ChangeLog:

	* decl.cc (cp_finish_decl): Call mark_single_function.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp1y/auto-fn65.C: New test.
---
 gcc/cp/decl.cc                         |  3 +++
 gcc/testsuite/g++.dg/cpp1y/auto-fn65.C | 10 ++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/cpp1y/auto-fn65.C

diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index 4665a29a24d..88f283bc4bd 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -8140,6 +8140,9 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
 	    d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
 						      tf_warning_or_error);
 	  d_init = resolve_nondeduced_context (d_init, tf_warning_or_error);
+	  /* Force auto deduction now.  Use tf_none to avoid redundant warnings
+	     on deprecated-14.C.  */
+	  mark_single_function (d_init, tf_none);
 	}
       enum auto_deduction_context adc = adc_variable_type;
       if (DECL_DECOMPOSITION_P (decl))
diff --git a/gcc/testsuite/g++.dg/cpp1y/auto-fn65.C b/gcc/testsuite/g++.dg/cpp1y/auto-fn65.C
new file mode 100644
index 00000000000..78bb004303b
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/auto-fn65.C
@@ -0,0 +1,10 @@
+// PR c++/106893
+// { dg-do compile { target c++14 } }
+
+template <typename T>
+struct CoordTraits
+{
+  static auto GetX(T const &p) { return 1; }
+};
+typedef CoordTraits<int> Traits;
+static constexpr auto GetX = Traits::GetX;

base-commit: 7c989a8ed47228bdd494a2f0d1f6fdd325f953d7
prerequisite-patch-id: cc4d1e7bcdd804ea5a1a64ea9a138d9279e5eaa8
-- 
2.31.1